This patch adds a bool variable (ycbcr_420_allowed) in the drm connector structure. While handling the EDID from HDMI 2.0 sinks, its important to know if the source is capable of handling YCBCR 420 outputs or not, so that a lot of work can be done/bypassed based on this information. One such example is adding YCBCR420 only modes.

If the driver knows that this source is not HDMI 2.0 capable, it will not add YCBCR420-only modes while adding EDID modes, and will prevent any runtime modeset failures.

This variable will be initialized from I915 driver in the next patch and will be used in the EDID handling for HDMI 2.0 specific features, in this same series.

V3: introduced the new variable V4: changed variable name from is_hdmi2_src to ycbcr_420_allowed (Ville) V4: adding r-b from Neil.

Reviewed-by: Neil Armstrong narmstrong@baylibre.com Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- include/drm/drm_connector.h | 9 +++++++++ 1 file changed, 9 insertions(+)

diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index ae5b7dc..8a78aaa 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -726,6 +726,15 @@ struct drm_connector { bool interlace_allowed; bool doublescan_allowed; bool stereo_allowed; + + /** + * @ycbcr_420_allowed : This bool indicates if this connector is + * capable of handling YCBCR 420 output. While parsing the EDID + * blocks, its very helpful to know, if the source is capable of + * handling YCBCR 420 outputs. + */ + bool ycbcr_420_allowed; + /** * @registered: Is this connector exposed (registered) with userspace? * Protected by @mutex.

YCBCR420 modes are supported only on HDMI 2.0 capable sources. This patch adds a drm helper to validate YCBCR420-only mode on a particular connector. This function will help pruning the YCBCR420-only modes from the connector's modelist.

V5: Introduced the patch in series.

Cc: Ville Syrjala ville.syrjala@linux.intel.com Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- drivers/gpu/drm/drm_edid.c | 3 ++- drivers/gpu/drm/drm_modes.c | 28 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_probe_helper.c | 4 ++++ include/drm/drm_edid.h | 1 + include/drm/drm_modes.h | 5 +++++ 5 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index b879662..ad26c5e 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2947,10 +2947,11 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match) } EXPORT_SYMBOL(drm_match_cea_mode);

-static bool drm_valid_cea_vic(u8 vic) +bool drm_valid_cea_vic(u8 vic) { return vic > 0 && vic < ARRAY_SIZE(edid_cea_modes); } +EXPORT_SYMBOL(drm_valid_cea_vic);

/** * drm_get_cea_aspect_ratio - get the picture aspect ratio corresponding to diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index f2493b9..3b53c8e3 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -1083,6 +1083,34 @@ drm_mode_validate_size(const struct drm_display_mode *mode, } EXPORT_SYMBOL(drm_mode_validate_size);

+/** + * drm_mode_ycbcr420_only - add 'ycbcr420-only' modes only when allowed + * @mode: mode to check + * @connector: drm connector under action + * + * This function is a helper which can be used to filter out any YCBCR420 + * only mode, when the source doesn't support it. + * + * Returns: + * The mode status + */ +enum drm_mode_status +drm_mode_validate_ycbcr420(const struct drm_display_mode *mode, + struct drm_connector *connector) +{ + u8 vic = drm_match_cea_mode(mode); + enum drm_mode_status status = MODE_OK; + struct drm_hdmi_info *hdmi = &connector->display_info.hdmi; + + if (drm_valid_cea_vic(vic) && test_bit(vic, hdmi->y420_vdb_modes)) { + if (!connector->ycbcr_420_allowed) + status = MODE_NO_420; + } + + return status; +} +EXPORT_SYMBOL(drm_mode_validate_ycbcr420); + #define MODE_STATUS(status) [MODE_ ## status + 3] = #status

static const char * const drm_mode_status_names[] = { diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index 00e6832..904966c 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -528,6 +528,10 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector, if (mode->status == MODE_OK) mode->status = drm_mode_validate_pipeline(mode, connector); + + if (mode->status == MODE_OK) + mode->status = drm_mode_validate_ycbcr420(mode, + connector); }

prune: diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index 89c0062..b55b2a7 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -477,4 +477,5 @@ void drm_edid_get_monitor_name(struct edid *edid, char *name, struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, int hsize, int vsize, int fresh, bool rb); +bool drm_valid_cea_vic(u8 vic); #endif /* __DRM_EDID_H__ */ diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h index 94ac771..f8a1268 100644 --- a/include/drm/drm_modes.h +++ b/include/drm/drm_modes.h @@ -80,6 +80,7 @@ struct videomode; * @MODE_ONE_SIZE: only one resolution is supported * @MODE_NO_REDUCED: monitor doesn't accept reduced blanking * @MODE_NO_STEREO: stereo modes not supported + * @MODE_NO_420: ycbcr 420 modes not supported * @MODE_STALE: mode has become stale * @MODE_BAD: unspecified reason * @MODE_ERROR: error condition @@ -124,6 +125,7 @@ enum drm_mode_status { MODE_ONE_SIZE, MODE_NO_REDUCED, MODE_NO_STEREO, + MODE_NO_420, MODE_STALE = -3, MODE_BAD = -2, MODE_ERROR = -1 @@ -496,6 +498,9 @@ bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1, enum drm_mode_status drm_mode_validate_basic(const struct drm_display_mode *mode); enum drm_mode_status drm_mode_validate_size(const struct drm_display_mode *mode, int maxX, int maxY); +enum drm_mode_status +drm_mode_validate_ycbcr420(const struct drm_display_mode *mode, + struct drm_connector *connector); void drm_mode_prune_invalid(struct drm_device *dev, struct list_head *mode_list, bool verbose); void drm_mode_sort(struct list_head *mode_list);

CEA-861-F adds ycbcr capability map block, for HDMI 2.0 sinks. This block contains a map of indexes of CEA modes, which can support YCBCR 420 output also. To avoid multiple parsing of same CEA block, let's parse the sink information and get this map, before parsing CEA modes.

This patch moves the call to drm_add_display_info function, before the mode parsing block.

V4: Introduced new patch in the series V5: Move this patch before 4:2:0 parsing patch (ville) Added r-b from Ville

Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- drivers/gpu/drm/drm_edid.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index ad26c5e..e574897 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4441,6 +4441,13 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) quirks = edid_get_quirks(edid);

/* + * CEA-861-F adds ycbcr capability map block, for HDMI 2.0 sinks. + * To avoid multiple parsing of same block, lets parse that map + * from sink info, before parsing CEA modes. + */ + drm_add_display_info(connector, edid); + + /* * EDID spec says modes should be preferred in this order: * - preferred detailed mode * - other detailed modes from base block @@ -4467,8 +4474,6 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) edid_fixup_preferred(connector, quirks);

- drm_add_display_info(connector, edid); - if (quirks & EDID_QUIRK_FORCE_6BPC) connector->display_info.bpc = 6;

HDMI 2.0 spec adds support for YCBCR420 sub-sampled output. CEA-861-F adds two new blocks in EDID's CEA extension blocks, to provide information about sink's YCBCR420 output capabilities.

These blocks are:

- YCBCR420vdb(YCBCR 420 video data block): This block contains VICs of video modes, which can be sopported only in YCBCR420 output mode (Not in RGB/YCBCR444/422. Its like a normal SVD block, valid for YCBCR420 modes only.

- YCBCR420cmdb(YCBCR 420 capability map data block): This block gives information about video modes which can support YCBCR420 output mode also (along with RGB,YCBCR444/422 etc) This block contains a bitmap index of normal svd videomodes, which can support YCBCR420 output too. So if bit 0 from first vcb byte is set, first video mode in the svd list can support YCBCR420 output too. Bit 1 means second video mode from svd list can support YCBCR420 output too, and so on.

This patch adds two bitmaps in display's hdmi_info structure, one each for VCB and VDB modes. If the source is HDMI 2.0 capable, this patch adds: - VDB modes (YCBCR 420 only modes) in connector's mode list, also makes an entry in the vdb_bitmap per vic. - VCB modes (YCBCR 420 also modes) only entry in the vcb_bitmap.

Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Jose Abreu joabreu@synopsys.com Cc: Emil Velikov emil.l.velikov@gmail.com

V2: Addressed Review comments from Emil: - Use 1ULL<<i instead of 1<<i to make sure the output is 64bit. - Use the suggested method for updating dbmap. - Add documentation for YCBCR420_vcb_map to fix kbuild warning.

Review comments from Ville: - Do not expose the YCBCR420 flags in uabi layer, keep it internal. - Save a map of YCBCR420 modes for future reference. - Check db length before trying to parse extended tag. - Add a warning if there are > 64 modes in capability map block. - Use y420cmdb in function names and macros while dealing with vcb to be aligned with spec. - Move the display information parsing block ahead of mode parsing blocks.

V3: Addressed design/review comments from Ville - Do not add flags in video modes, else we have to expose them to user - There should not be a UABI change, and kernel should detect the choice of the output based on type of mode, and the bitmaps. - Use standard bitops from kernel bitmap header, instead of calculating bit positions manually.

V4: Addressed review comments from Ville: - s/ycbcr_420_vdb/y420vdb - s/ycbcr_420_vcb/y420cmdb - Be less verbose on description of do_y420vdb_modes - Move newmode variable in the loop scope. - Use svd_to_vic() to get a VIC, instead of 0x7f - Remove bitmap description for CMDB modes & VDB modes - Dont add connector->ycbcr_420_allowed check for cmdb modes - Remove 'len' variable, in is_y420cmdb function, which is used only once - Add length check in is_y420vdb function - Remove unnecessary if (!db) check in function parse_y420cmdb_bitmap - Do not add print about YCBCR 420 modes - Fix indentation in few places - Move ycbcr420_dc_modes in next patch, where its used - Add a separate patch for movement of drm_add_display_info()

V5: Addressed review comments from Ville: - Add the patch which cleans up the current EXTENDED_TAG usage - Make y420_cmdb_map u64 - Do not block ycbcr420 modes while parsing the EDID, rather add a separate helper function to prune ycbcr420-only modes from connector's probed modes.

Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- drivers/gpu/drm/drm_edid.c | 148 +++++++++++++++++++++++++++++++++++++++++++- include/drm/drm_connector.h | 20 ++++++ 2 files changed, 166 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index d0b27b5..44be128 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2783,6 +2783,8 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid, #define SPEAKER_BLOCK 0x04 #define USE_EXTENDED_TAG 0x07 #define EXT_VIDEO_CAPABILITY_BLOCK 0x00 +#define EXT_VIDEO_DATA_BLOCK_420 0x0E +#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F #define EDID_BASIC_AUDIO (1 << 6) #define EDID_CEA_YCRCB444 (1 << 5) #define EDID_CEA_YCRCB422 (1 << 4) @@ -3155,15 +3157,79 @@ drm_display_mode_from_vic_index(struct drm_connector *connector, return newmode; }

+/* + * do_y420vdb_modes - Parse YCBCR 420 only modes + * @connector: connector corresponding to the HDMI sink + * @svds: start of the data block of CEA YCBCR 420 VDB + * @len: length of the CEA YCBCR 420 VDB + * + * Parse the CEA-861-F YCBCR 420 Video Data Block (Y420VDB) + * which contains modes which can be supported in YCBCR 420 + * output format only. + */ +static int do_y420vdb_modes(struct drm_connector *connector, + const u8 *svds, u8 svds_len) +{ + int modes = 0, i; + struct drm_device *dev = connector->dev; + struct drm_display_info *info = &connector->display_info; + struct drm_hdmi_info *hdmi = &info->hdmi; + + for (i = 0; i < svds_len; i++) { + u8 vic = svd_to_vic(svds[i]); + struct drm_display_mode *newmode; + + newmode = drm_mode_duplicate(dev, &edid_cea_modes[vic]); + if (!newmode) + break; + bitmap_set(hdmi->y420_vdb_modes, vic, 1); + drm_mode_probed_add(connector, newmode); + modes++; + } + + if (modes > 0) + info->color_formats |= DRM_COLOR_FORMAT_YCRCB420; + return modes; +} + +/* + * drm_add_cmdb_modes - Add a YCBCR 420 mode into bitmap + * @connector: connector corresponding to the HDMI sink + * @vic: CEA vic for the video mode to be added in the map + * + * Makes an entry for a videomode in the YCBCR 420 bitmap + */ +static void +drm_add_cmdb_modes(struct drm_connector *connector, u8 svd) +{ + u8 vic = svd_to_vic(svd); + struct drm_hdmi_info *hdmi = &connector->display_info.hdmi; + + bitmap_set(hdmi->y420_cmdb_modes, vic, 1); +} + static int do_cea_modes(struct drm_connector *connector, const u8 *db, u8 len) { int i, modes = 0; + struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;

for (i = 0; i < len; i++) { struct drm_display_mode *mode; mode = drm_display_mode_from_vic_index(connector, db, len, i); if (mode) { + /* + * YCBCR420 capability block contains a bitmap which + * gives the index of CEA modes from CEA VDB, which + * can support YCBCR 420 sampling output also (apart + * from RGB/YCBCR444 etc). + * For example, if the bit 0 in bitmap is set, + * first mode in VDB can support YCBCR420 output too. + * Add YCBCR420 modes only if sink is HDMI 2.0 capable. + */ + if (hdmi->y420_cmdb_map & (1 << i)) + drm_add_cmdb_modes(connector, db[i]); + drm_mode_probed_add(connector, mode); modes++; } @@ -3505,9 +3571,78 @@ static bool cea_db_is_hdmi_forum_vsdb(const u8 *db) return oui == HDMI_FORUM_IEEE_OUI; }

+static bool cea_db_is_y420cmdb(const u8 *db) +{ + + if (cea_db_tag(db) != USE_EXTENDED_TAG) + return false; + + if (!cea_db_payload_len(db)) + return false; + + if (cea_db_extended_tag(db) != EXT_VIDEO_CAP_BLOCK_Y420CMDB) + return false; + + return true; +} + +static bool cea_db_is_y420vdb(const u8 *db) +{ + if (cea_db_tag(db) != USE_EXTENDED_TAG) + return false; + + if (!cea_db_payload_len(db)) + return false; + + if (cea_db_extended_tag(db) != EXT_VIDEO_DATA_BLOCK_420) + return false; + + return true; +} + #define for_each_cea_db(cea, i, start, end) \ for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)

+static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector, + const u8 *db) +{ + struct drm_display_info *info = &connector->display_info; + struct drm_hdmi_info *hdmi = &info->hdmi; + u8 map_len = cea_db_payload_len(db) - 1; + u8 count; + u64 map = 0; + + if (map_len == 0) { + /* All CEA modes support ycbcr420 sampling also.*/ + hdmi->y420_cmdb_map = U64_MAX; + info->color_formats |= DRM_COLOR_FORMAT_YCRCB420; + return; + } + + /* + * This map indicates which of the existing CEA block modes + * from VDB can support YCBCR420 output too. So if bit=0 is + * set, first mode from VDB can support YCBCR420 output too. + * We will parse and keep this map, before parsing VDB itself + * to avoid going through the same block again and again. + * + * Spec is not clear about max possible size of this block. + * Clamping max bitmap block size at 8 bytes. Every byte can + * address 8 CEA modes, in this way this map can address + * 8*8 = first 64 SVDs. + */ + if (WARN_ON_ONCE(map_len > 8)) + map_len = 8; + + for (count = 0; count < map_len; count++) + map |= (u64)db[2 + count] << (8 * count); + + if (map) + info->color_formats |= DRM_COLOR_FORMAT_YCRCB420; + + hdmi->y420_cmdb_map = map; +} + static int add_cea_modes(struct drm_connector *connector, struct edid *edid) { @@ -3530,10 +3665,16 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid) video = db + 1; video_len = dbl; modes += do_cea_modes(connector, video, dbl); - } - else if (cea_db_is_hdmi_vsdb(db)) { + } else if (cea_db_is_hdmi_vsdb(db)) { hdmi = db; hdmi_len = dbl; + } else if (cea_db_is_y420vdb(db)) { + const u8 *vdb420 = &db[2]; + + /* Add 4:2:0(only) modes present in EDID */ + modes += do_y420vdb_modes(connector, + vdb420, + dbl - 1); } } } @@ -4216,6 +4357,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector, drm_parse_hdmi_vsdb_video(connector, db); if (cea_db_is_hdmi_forum_vsdb(db)) drm_parse_hdmi_forum_vsdb(connector, db); + if (cea_db_is_y420cmdb(db)) + drm_parse_y420cmdb_bitmap(connector, db); } }

@@ -4477,6 +4620,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) num_modes += add_cea_modes(connector, edid); num_modes += add_alternate_cea_modes(connector, edid); num_modes += add_displayid_detailed_modes(connector, edid); + if (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF) num_modes += add_inferred_modes(connector, edid);

diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 8a78aaa..225e092 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -135,6 +135,25 @@ struct drm_scdc { struct drm_hdmi_info { /** @scdc: sink's scdc support and capabilities */ struct drm_scdc scdc; + + /** + * @y420_vdb_modes: bitmap of modes which can support ycbcr420 + * output only (not normal RGB/YCBCR444/422 outputs). There are total + * 107 VICs defined by CEA-861-F spec, so the size is 128 bits to map + * upto 128 VICs; + */ + unsigned long y420_vdb_modes[BITS_TO_LONGS(128)]; + + /** + * @y420_cmdb_modes: bitmap of modes which can support ycbcr420 + * output also, along with normal HDMI outputs. There are total 107 + * VICs defined by CEA-861-F spec, so the size is 128 bits to map upto + * 128 VICs; + */ + unsigned long y420_cmdb_modes[BITS_TO_LONGS(128)]; + + /** @y420_cmdb_map: bitmap of SVD index, to extraxt vcb modes */ + u64 y420_cmdb_map; };

/** @@ -198,6 +217,7 @@ struct drm_display_info { #define DRM_COLOR_FORMAT_RGB444 (1<<0) #define DRM_COLOR_FORMAT_YCRCB444 (1<<1) #define DRM_COLOR_FORMAT_YCRCB422 (1<<2) +#define DRM_COLOR_FORMAT_YCRCB420 (1<<3)

/** * @color_formats: HDMI Color formats, selects between RGB and YCrCb

HDMI displays can support various output types, based on the color space and subsampling type. The possible outputs from a HDMI 2.0 monitor could be: - RGB - YCBCR 444 - YCBCR 422 - YCBCR 420

This patch adds a drm property "hdmi_output_format", using which, a user can specify its preference, for the HDMI output type. The output type enums are similar to the mentioned outputs above. To handle various subsampling of YCBCR output types, this property allows two special cases: - DRM_HDMI_OUTPUT_YCBCR_HQ This indicates preferred output should be YCBCR output, with highest subsampling rate by the source/sink, which can be typically: - ycbcr444 - ycbcr422 - ycbcr420 - DRM_HDMI_OUTPUT_YCBCR_LQ This indicates preferred output should be YCBCR output, with lowest subsampling rate supported by source/sink, which can be: - ycbcr420 - ycbcr422 - ycbcr444

Default value of the property is set to 0 = RGB, so no changes if you dont set the property.

PS: While doing modeset for YCBCR 420 only modes, this property is ignored, as those timings can be supported only in YCBCR 420 output mode.

V2: Added description for the new variable to address build warning V3: Rebase V4: Rebase V5: Added get_property counterpart to fix IGT BAT failures (BAT/CI) Danvet: - Add documentation for the new property - Create a sub-section for HDMI properties, and add documentation for few more HDMI propeties. Added documentation for: - Broadcast RGB - aspect ratio

Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Jose Abreu joabreu@synopsys.com Cc: Daniel Vetter daniel.vetter@intel.com Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- Documentation/gpu/drm-kms.rst | 12 +++++++ drivers/gpu/drm/drm_atomic.c | 4 +++ drivers/gpu/drm/drm_atomic_helper.c | 4 +++ drivers/gpu/drm/drm_connector.c | 69 ++++++++++++++++++++++++++++++++++++- drivers/gpu/drm/drm_crtc_internal.h | 1 + drivers/gpu/drm/drm_mode_config.c | 4 +++ drivers/gpu/drm/i915/intel_modes.c | 13 +++++++ include/drm/drm_connector.h | 18 ++++++++++ include/drm/drm_mode_config.h | 5 +++ 9 files changed, 129 insertions(+), 1 deletion(-)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 3072841..dcdd6ff 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -508,6 +508,18 @@ Standard Connector Properties .. kernel-doc:: drivers/gpu/drm/drm_connector.c :doc: standard connector properties

+Standard HDMI Properties +----------------------------- + +.. kernel-doc:: drivers/gpu/drm/drm_connector.c + :doc: hdmi_output_format + +.. kernel-doc:: drivers/gpu/drm/drm_connector.c + :doc: aspect ratio property + +.. kernel-doc:: drivers/gpu/drm/i915/intel_modes.c + :doc: Broadcast RGB property + Plane Composition Properties ----------------------------

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 09ca662..adcb89d 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1192,6 +1192,8 @@ int drm_atomic_connector_set_property(struct drm_connector *connector, state->picture_aspect_ratio = val; } else if (property == connector->scaling_mode_property) { state->scaling_mode = val; + } else if (property == config->hdmi_output_property) { + state->hdmi_output = val; } else if (connector->funcs->atomic_set_property) { return connector->funcs->atomic_set_property(connector, state, property, val); @@ -1272,6 +1274,8 @@ drm_atomic_connector_get_property(struct drm_connector *connector, *val = state->picture_aspect_ratio; } else if (property == connector->scaling_mode_property) { *val = state->scaling_mode; + } else if (property == config->hdmi_output_property) { + *val = state->hdmi_output; } else if (connector->funcs->atomic_get_property) { return connector->funcs->atomic_get_property(connector, state, property, val); diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 23e4661..2e7459f 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -637,6 +637,10 @@ drm_atomic_helper_check_modeset(struct drm_device *dev, if (old_connector_state->link_status != new_connector_state->link_status) new_crtc_state->connectors_changed = true; + + if (old_connector_state->hdmi_output != + new_connector_state->hdmi_output) + new_crtc_state->connectors_changed = true; }

if (funcs->atomic_check) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 8072e6e..8357918 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -227,6 +227,11 @@ int drm_connector_init(struct drm_device *dev, config->edid_property, 0);

+ if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL) + drm_object_attach_property(&connector->base, + config->hdmi_output_property, + 0); + drm_object_attach_property(&connector->base, config->dpms_property, 0);

@@ -617,6 +622,26 @@ static const struct drm_prop_enum_list drm_link_status_enum_list[] = { }; DRM_ENUM_NAME_FN(drm_get_link_status_name, drm_link_status_enum_list)

+static const struct drm_prop_enum_list drm_hdmi_output_enum_list[] = { + { DRM_HDMI_OUTPUT_DEFAULT_RGB, "output_rgb" }, + { DRM_HDMI_OUTPUT_YCBCR444, "output_ycbcr444" }, + { DRM_HDMI_OUTPUT_YCBCR422, "output_ycbcr422" }, + { DRM_HDMI_OUTPUT_YCBCR420, "output_ycbcr420" }, + { DRM_HDMI_OUTPUT_YCBCR_HQ, "output_ycbcr_high_subsampling" }, + { DRM_HDMI_OUTPUT_YCBCR_LQ, "output_ycbcr_low_subsampling" }, + { DRM_HDMI_OUTPUT_INVALID, "invalid_output" }, +}; + +/** + * drm_get_hdmi_output_name - return a string for a given hdmi output enum + * @type: enum of output type + */ +const char *drm_get_hdmi_output_name(enum drm_hdmi_output_type type) +{ + return drm_hdmi_output_enum_list[type].name; +} +EXPORT_SYMBOL(drm_get_hdmi_output_name); + /** * drm_display_info_set_bus_formats - set the supported bus formats * @info: display info to store bus formats in @@ -697,7 +722,36 @@ static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = { { DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */ }; DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name, - drm_tv_subconnector_enum_list) + drm_tv_subconnector_enum_list); + +/** + * DOC: hdmi_output_format + * + * hdmi_output_format: + * Enum property which allows a userspace to provide its preference for a + * HDMI output format. Standard HDMI 1.4b outputs can support RGB/YCBCR444 + * YCBCR422 output formats, whereas HDMI 2.0 outputs can additionally + * support YCBCR420 output. Default value of the property is HDMI output + * RGB. + * + * A driver can attach to this property, and then handle the HDMI output + * based on its capabilities and sink support. There are few helper + * functions available in drm_modes.c which can help in finding the best + * suitable output considering a sink/source/mode combination. Refer to + * drm_modes.c:drm_display_info_hdmi_output_type() + */ +int drm_connector_create_hdmi_properties(struct drm_device *dev) +{ + struct drm_property *prop; + + prop = drm_property_create_enum(dev, 0, "hdmi_output_format", + drm_hdmi_output_enum_list, + ARRAY_SIZE(drm_hdmi_output_enum_list)); + if (!prop) + return -ENOMEM; + dev->mode_config.hdmi_output_property = prop; + return 0; +}

/** * DOC: standard connector properties @@ -1024,6 +1078,19 @@ int drm_connector_attach_scaling_mode_property(struct drm_connector *connector, } EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);

+ +/** + * DOC: aspect ratio property + * + * aspect ratio: + * Enum property to override the HDMI output's aspect ratio. + * When this property is set, the aspect ratio of the frame in + * AVI infoframes is set as per the property value. For example + * if userspace sets the property value to DRM_MODE_PICTURE_ASPECT_4_3 + * the output aspect ratio is set to 4:3 (regardless of the PAR of mode) + * + */ + /** * drm_mode_create_aspect_ratio_property - create aspect ratio property * @dev: DRM device diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h index d077c54..e6c4adc 100644 --- a/drivers/gpu/drm/drm_crtc_internal.h +++ b/drivers/gpu/drm/drm_crtc_internal.h @@ -140,6 +140,7 @@ int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj, struct drm_property *property, uint64_t value); int drm_connector_create_standard_properties(struct drm_device *dev); +int drm_connector_create_hdmi_properties(struct drm_device *dev); const char *drm_get_connector_force_name(enum drm_connector_force force);

/* IOCTL */ diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c index d986225..3ba9262 100644 --- a/drivers/gpu/drm/drm_mode_config.c +++ b/drivers/gpu/drm/drm_mode_config.c @@ -210,6 +210,10 @@ static int drm_mode_create_standard_properties(struct drm_device *dev) if (ret) return ret;

+ ret = drm_connector_create_hdmi_properties(dev); + if (ret) + return ret; + prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE, "type", drm_plane_type_enum_list, ARRAY_SIZE(drm_plane_type_enum_list)); diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c index 951e834..d07de45 100644 --- a/drivers/gpu/drm/i915/intel_modes.c +++ b/drivers/gpu/drm/i915/intel_modes.c @@ -104,6 +104,19 @@ static const struct drm_prop_enum_list broadcast_rgb_names[] = { { INTEL_BROADCAST_RGB_LIMITED, "Limited 16:235" }, };

+/** + * DOC: Broadcast RGB property + * + * Broadcast RGB: + * Enum property to indicate RGB color range of a HDMI output. + * For limited range RGB outputs, a remapping of pixel values from 0-255 + * should be remaped to a range of 16-235. When this property is set to + * Limited 16:235 and CTM is set, the hardware will be programmed with the + * result of the multiplication of CTM by the limited range matrix, to + * ensure the pixels normaly in the range 0..1.0 are remapped to the range + * 16/255..235/255. + * + */ void intel_attach_broadcast_rgb_property(struct drm_connector *connector) { diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 4bc0882..3773600 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -319,6 +319,17 @@ struct drm_tv_connector_state { unsigned int hue; };

+/* HDMI output pixel format */ +enum drm_hdmi_output_type { + DRM_HDMI_OUTPUT_DEFAULT_RGB, /* default RGB */ + DRM_HDMI_OUTPUT_YCBCR444, /* YCBCR 444 */ + DRM_HDMI_OUTPUT_YCBCR422, /* YCBCR 422 */ + DRM_HDMI_OUTPUT_YCBCR420, /* YCBCR 420 */ + DRM_HDMI_OUTPUT_YCBCR_HQ, /* Highest subsampled YUV */ + DRM_HDMI_OUTPUT_YCBCR_LQ, /* Lowest subsampled YUV */ + DRM_HDMI_OUTPUT_INVALID, /* Guess what ? */ +}; + /** * struct drm_connector_state - mutable connector state * @connector: backpointer to the connector @@ -363,6 +374,12 @@ struct drm_connector_state { * upscaling, mostly used for built-in panels. */ unsigned int scaling_mode; + + /** + * @hdmi_output: Connector property to control the + * HDMI output mode (RGB/YCBCR444/422/420). + */ + enum drm_hdmi_output_type hdmi_output; };

/** @@ -991,6 +1008,7 @@ static inline void drm_connector_unreference(struct drm_connector *connector)

const char *drm_get_connector_status_name(enum drm_connector_status status); const char *drm_get_subpixel_order_name(enum subpixel_order order); +const char *drm_get_hdmi_output_name(enum drm_hdmi_output_type type); const char *drm_get_dpms_name(int val); const char *drm_get_dvi_i_subconnector_name(int val); const char *drm_get_dvi_i_select_name(int val); diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index 4298171..1887261 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -740,6 +740,11 @@ struct drm_mode_config { * the position of the output on the host's screen. */ struct drm_property *suggested_y_property; + /** + * @hdmi_output_property: output pixel format from HDMI display + * Default is set for RGB + */ + struct drm_property *hdmi_output_property;

/* dumb ioctl parameters */ uint32_t preferred_depth, prefer_shadow;

This patch adds set of helper functions for YCBCR HDMI output handling. These functions provide functionality like: - check if a given video mode is YCBCR 420 only mode. - check if a given video mode is YCBCR 420 mode. - get the highest subsamled ycbcr output. - get the lowest subsamled ycbcr output. - check if a given source and sink combination can support any YCBCR HDMI output. - check if a given source and sink combination can support a particular YCBCR HDMI output.

Currently all these helpers are kept static, and only one wrapper function is exposed to callers, which is "drm_find_hdmi_output_type". This function takes inputs as current mode, user preference and src + sink capabilities, and provides the most suitable HDMI output format to match all of these inputs.

This wrapper function will be used in next few patches in this series from I915 driver.

V2: Added YCBCR functions as helpers in DRM layer, instead of keeping it in I915 layer. V3: Added handling for YCBCR-420 only modes too. V4: EXPORT_SYMBOL(drm_find_hdmi_output_type) V5: Addressed review comments from Danvet: - %s/drm_find_hdmi_output_type/drm_display_info_hdmi_output_type - %s/drm_can_support_ycbcr_output/drm_display_supports_ycbcr_output - %s/drm_can_support_this_ycbcr_output/ drm_display_supports_this_ycbcr_output - pass drm_display_info instead of drm_connector for consistency - For drm_get_highest_quality_ycbcr_supported doc, move the variable description above, and then the function description.

Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Jose Abreu Jose.Abreu@synopsys.com Cc: Daniel Vetter daniel.vetter@intel.com Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- drivers/gpu/drm/drm_modes.c | 307 ++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_modes.h | 5 + 2 files changed, 312 insertions(+)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 3b53c8e3..0c42bbb 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -1604,3 +1604,310 @@ int drm_mode_convert_umode(struct drm_display_mode *out, out: return ret; } + +/** + * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420 + * output format + * + * @connector: drm connector under action. + * @mode: video mode to be tested. + * + * Returns: + * true if the mode can support YCBCR420 output + * false if not. + */ +static bool drm_mode_is_420_only(struct drm_display_info *display, + struct drm_display_mode *mode) +{ + u8 vic = drm_match_cea_mode(mode); + + /* + * Requirements of a 420_only mode: + * must be a valid cea mode + * entry in 420_only bitmap + */ + if (!drm_valid_cea_vic(vic)) + return false; + + return test_bit(vic, display->hdmi.y420_vdb_modes); +} + +/** + * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420 + * output format also (along with RGB/YCBCR444/422) + * + * @display: display under action. + * @mode: video mode to be tested. + * + * Returns: + * true if the mode can support YCBCR420 output + * false if not. + */ +static bool drm_mode_is_420_also(struct drm_display_info *display, + struct drm_display_mode *mode) +{ + u8 vic = drm_match_cea_mode(mode); + + /* + * Requirements of a 420_also mode: + * must be a valid cea mode + * entry in 420_also bitmap + */ + if (!drm_valid_cea_vic(vic)) + return false; + + return test_bit(vic, display->hdmi.y420_cmdb_modes); +} + + +static bool drm_mode_is_420(struct drm_display_info *display, + struct drm_display_mode *mode) +{ + return drm_mode_is_420_only(display, mode) || + drm_mode_is_420_also(display, mode); +} + +/** + * drm_display_supports_this_ycbcr_output - can a given source and sink + * combination support a particular YCBCR output type. + * + * @display: sink information. + * @mode: video mode from modeset + * @type: enum indicating YCBCR output type + * @source_outputs: bitmap of source supported HDMI output formats. + * + * Returns: + * true on success. + * false on failure. + */ +static bool +drm_display_supports_this_ycbcr_output(struct drm_display_info *display, + struct drm_display_mode *mode, + enum drm_hdmi_output_type type, + u32 source_outputs) +{ + /* YCBCR420 output support can be per mode basis */ + if (type == DRM_HDMI_OUTPUT_YCBCR420 && + !drm_mode_is_420(display, mode)) + return false; + + return display->color_formats & source_outputs & type; +} + +/** + * drm_display_supports_ycbcr_output - can a given source and sink combination + * support any YCBCR outputs ? + * + * @display: sink information. + * @source_outputs: bitmap of source supported HDMI output formats. + * + * Returns: + * true on success. + * false on failure. + */ +static bool drm_display_supports_ycbcr_output(struct drm_display_info *display, + u32 source_outputs) +{ + u32 supported_formats; + + if (!source_outputs || !display->color_formats) { + DRM_DEBUG_KMS("Source/Sink doesn't support any output ?\n"); + return DRM_HDMI_OUTPUT_INVALID; + } + + /* Get the common supported fromats between source and sink */ + supported_formats = display->color_formats & source_outputs; + if (!supported_formats || (supported_formats == + DRM_COLOR_FORMAT_RGB444)) { + DRM_ERROR("No common YCBCR formats between source and sink\n"); + return false; + } + + DRM_DEBUG_KMS("Src and Sink combination can support YCBCR output\n"); + return true; +} + +/** + * drm_get_highest_quality_ycbcr_supported - get the ycbcr output mode + * with highest subsampling rate + * @display: struct drm_display_info from current connector + * @mode: video mode from modeset + * @source_output_map: bitmap of supported HDMI output modes from source + * + * Finds the best possible ycbcr output mode (based on subsampling), for the + * given source and sink combination. + * + * Returns: + * enum corresponding to best output mode on success. + * DRM_HDMI_OUTPUT_INVALID on failure. + */ +static enum drm_hdmi_output_type +drm_get_highest_quality_ycbcr_supported(struct drm_display_info *display, + struct drm_display_mode *mode, + u32 source_output_map) +{ + enum drm_hdmi_output_type output = DRM_HDMI_OUTPUT_INVALID; + u32 supported_formats = source_output_map & display->color_formats; + + /* + * Get the ycbcr output with the highest possible subsampling rate. + * Preference should go as: + * ycbcr 444 + * ycbcr 422 + * ycbcr 420 + */ + if (supported_formats & DRM_COLOR_FORMAT_YCRCB444) + output = DRM_COLOR_FORMAT_YCRCB444; + else if (supported_formats & DRM_COLOR_FORMAT_YCRCB422) + output = DRM_COLOR_FORMAT_YCRCB422; + else if (supported_formats & DRM_COLOR_FORMAT_YCRCB420 && + drm_mode_is_420(display, mode)) + output = DRM_COLOR_FORMAT_YCRCB420; + + DRM_DEBUG_KMS("Highest subsampled YCBCR mode supported is %s\n", + drm_get_hdmi_output_name(supported_formats)); + return output; +} + +/** + * drm_get_lowest_quality_ycbcr_supported - get the ycbcr output mode + * with lowest subsampling rate + * @display: struct drm_display_info from current connector + * @mode: video mode from modeset + * @source_output_map: bitmap of supported HDMI output modes from source + * + * Finds the lowest possible ycbcr output mode (based on subsampling), for the + * given source and sink combination. + * + * Returns: + * enum corresponding to best output mode on success. + * DRM_HDMI_OUTPUT_INVALID on failure. + */ +static enum drm_hdmi_output_type +drm_get_lowest_quality_ycbcr_supported(struct drm_display_info *display, + struct drm_display_mode *mode, + u32 source_output_map) +{ + enum drm_hdmi_output_type output = DRM_HDMI_OUTPUT_INVALID; + u32 supported_formats = source_output_map & display->color_formats; + + /* + * Get the ycbcr output with the lowest possible subsampling rate. + * Preference should go as: + * ycbcr 420 + * ycbcr 422 + * ycbcr 444 + */ + if (supported_formats & DRM_COLOR_FORMAT_YCRCB420 && + drm_mode_is_420(display, mode)) + output = DRM_HDMI_OUTPUT_YCBCR420; + else if (display->color_formats & DRM_COLOR_FORMAT_YCRCB422) + output = DRM_HDMI_OUTPUT_YCBCR422; + else if (display->color_formats & DRM_COLOR_FORMAT_YCRCB444) + output = DRM_HDMI_OUTPUT_YCBCR420; + + DRM_DEBUG_KMS("Lowest subsampled YCBCR mode supported is %s\n", + drm_get_hdmi_output_name(supported_formats)); + return output; +} + +/** + * drm_find_hdmi_output_type - get the most suitable output + * @info: connected display's information from connector + * @mode: video mode under modeset + * @type: user's choice for preferred mode, set via drm property + * "hdmi_output_format" + * @src_output_cap: bitmap of source's supported outputs formats + * src_output_cap = (1 << DRM_COLOR_FORMAT_RGB444) means source + * supports RGB444 + * src_output_cap = (1 << DRM_COLOR_FORMAT_YCRCB444) means source + * supports YUV444, and so on. + * + * Find the best suitable HDMI output considering mode, source capability, + * sink capability and user's choice (expressed in form of drm property) + * + * Returns: + * enum corresponding to best suitable output type on success. + * DRM_HDMI_OUTPUT_INVALID on failure. + */ +enum drm_hdmi_output_type +drm_display_info_hdmi_output_type(struct drm_display_info *info, + struct drm_display_mode *mode, + enum drm_hdmi_output_type type, + u32 src_output_cap) +{ + bool ret; + bool mode_is_420_only = drm_mode_is_420_only(info, mode); + + /* + * If the preferred output is not set to YCBCR by user, and the mode + * doesn't force us to drive YCBCR420 output, respect the user + * preference for the output type. But if the mode is 420_only, we will + * be force to drive YCBCR420 output. + */ + if (!mode_is_420_only) { + if (type == DRM_HDMI_OUTPUT_DEFAULT_RGB) + return DRM_HDMI_OUTPUT_DEFAULT_RGB; + } else { + type = DRM_HDMI_OUTPUT_YCBCR420; + DRM_DEBUG_KMS("Got a 420 only mode(%s)\n", mode->name); + } + + /* If this src + sink combination can support any YCBCR output */ + ret = drm_display_supports_ycbcr_output(info, src_output_cap); + if (!ret) { + DRM_ERROR("No supported YCBCR output\n"); + return DRM_HDMI_OUTPUT_INVALID; + } + + switch (type) { + case DRM_HDMI_OUTPUT_YCBCR_HQ: + type = drm_get_highest_quality_ycbcr_supported(info, mode, + src_output_cap); + break; + + case DRM_HDMI_OUTPUT_YCBCR_LQ: + type = drm_get_lowest_quality_ycbcr_supported(info, mode, + src_output_cap); + break; + + case DRM_HDMI_OUTPUT_YCBCR420: + ret = drm_mode_is_420(info, mode); + if (!ret) { + DRM_ERROR("Mode %s doesn't support 420 output\n", + mode->name); + type = DRM_HDMI_OUTPUT_INVALID; + } + + break; + + /* Below cases are just to satisfy checkpatch's AI */ + case DRM_HDMI_OUTPUT_DEFAULT_RGB: + case DRM_HDMI_OUTPUT_YCBCR444: + case DRM_HDMI_OUTPUT_YCBCR422: + break; + + default: + type = DRM_HDMI_OUTPUT_INVALID; + } + + if (type == DRM_HDMI_OUTPUT_INVALID) { + DRM_ERROR("Can't support mode %s in YCBCR format\n", + mode->name); + return DRM_HDMI_OUTPUT_INVALID; + } + + /* Test if this src/sink/mode combination can support selected output */ + ret = drm_display_supports_this_ycbcr_output(info, mode, type, + src_output_cap); + if (!ret) { + DRM_ERROR("Output %s can't be supported\n", + drm_get_hdmi_output_name(type)); + return DRM_HDMI_OUTPUT_INVALID; + } + + DRM_DEBUG_KMS("Best supported output is: %s\n", + drm_get_hdmi_output_name(type)); + return type; +} +EXPORT_SYMBOL(drm_display_info_hdmi_output_type); diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h index f8a1268..c5824aa 100644 --- a/include/drm/drm_modes.h +++ b/include/drm/drm_modes.h @@ -453,6 +453,11 @@ int drm_mode_convert_umode(struct drm_display_mode *out, void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode); void drm_mode_debug_printmodeline(const struct drm_display_mode *mode);

+enum drm_hdmi_output_type +drm_display_info_hdmi_output_type(struct drm_display_info *info, + struct drm_display_mode *mode, + enum drm_hdmi_output_type type, + u32 src_output_cap); struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh, bool reduced, bool interlaced,

To get a YCBCR420 output from intel platforms, we need one scaler to scale down YCBCR444 samples to YCBCR420 samples.

This patch: - Does scaler allocation for HDMI ycbcr420 outputs. - Programs PIPE_MISC register for ycbcr420 output. - Adds a new scaler user "HDMI output" to plug-into existing scaler framework. This output type is identified using bit 30 of the scaler users bitmap.

V2: rebase V3: rebase V4: rebase V5: addressed review comments from Ander: - No need to check both scaler_user && hdmi_output. Check for scaler_user is enough.

Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Ander Conselvan De Oliveira conselvan2@gmail.com Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- drivers/gpu/drm/i915/intel_atomic.c | 6 ++++++ drivers/gpu/drm/i915/intel_display.c | 24 ++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_drv.h | 10 +++++++++- drivers/gpu/drm/i915/intel_hdmi.c | 10 ++++++++++ drivers/gpu/drm/i915/intel_panel.c | 3 ++- 5 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c index 36d4e63..a8c9ac5 100644 --- a/drivers/gpu/drm/i915/intel_atomic.c +++ b/drivers/gpu/drm/i915/intel_atomic.c @@ -264,6 +264,12 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,

/* panel fitter case: assign as a crtc scaler */ scaler_id = &scaler_state->scaler_id; + } else if (i == SKL_HDMI_OUTPUT_INDEX) { + name = "HDMI-OUTPUT"; + idx = intel_crtc->base.base.id; + + /* hdmi output case: needs a pipe scaler */ + scaler_id = &scaler_state->scaler_id; } else { name = "PLANE";

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 082270d..ee1452e 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4621,6 +4621,10 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach, */ need_scaling = src_w != dst_w || src_h != dst_h;

+ if (scaler_user == SKL_HDMI_OUTPUT_INDEX) + /* YCBCR 444 -> 420 conversion needs a scaler */ + need_scaling = true; + /* * if plane is being disabled or scaler is no more required or force detach * - free scaler binded to this plane/crtc @@ -4668,6 +4672,26 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach, }

/** + * skl_update_scaler_hdmi_output - Stages update to scaler state for HDMI. + * HDMI YCBCR 420 output needs a scaler, for downsampling. + * + * @state: crtc's scaler state + * + * Return + * 0 - scaler_usage updated successfully + * error - requested scaling cannot be supported or other error condition + */ +int skl_update_scaler_crtc_hdmi_output(struct intel_crtc_state *state) +{ + const struct drm_display_mode *mode = &state->base.adjusted_mode; + + return skl_update_scaler(state, !state->base.active, + SKL_HDMI_OUTPUT_INDEX, &state->scaler_state.scaler_id, + state->pipe_src_w, state->pipe_src_h, + mode->crtc_hdisplay, mode->crtc_vdisplay); +} + +/** * skl_update_scaler_crtc - Stages update to scaler state for a given crtc. * * @state: crtc's scaler state diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index cc25d71..86af283 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -471,7 +471,8 @@ struct intel_crtc_scaler_state { * * If a bit is set, a user is using a scaler. * Here user can be a plane or crtc as defined below: - * bits 0-30 - plane (bit position is index from drm_plane_index) + * bits 0-29 - plane (bit position is index from drm_plane_index) + * bit 30 - hdmi output * bit 31 - crtc * * Instead of creating a new index to cover planes and crtc, using @@ -484,6 +485,12 @@ struct intel_crtc_scaler_state { * avilability. */ #define SKL_CRTC_INDEX 31 + + /* + * HDMI YCBCR 420 output consume a scaler. So adding a user + * for HDMI output 420 requirement. + */ +#define SKL_HDMI_OUTPUT_INDEX 30 unsigned scaler_users;

/* scaler used by crtc for panel fitting purpose */ @@ -1483,6 +1490,7 @@ void intel_mode_from_pipe_config(struct drm_display_mode *mode, struct intel_crtc_state *pipe_config);

int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state); +int skl_update_scaler_crtc_hdmi_output(struct intel_crtc_state *state); int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state);

static inline u32 intel_plane_ggtt_offset(const struct intel_plane_state *state) diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index 3a07431..948cbce 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -1403,6 +1403,7 @@ intel_hdmi_compute_ycbcr_config(struct drm_connector_state *conn_state, }

if (type == DRM_HDMI_OUTPUT_YCBCR420) { + struct intel_crtc *intel_crtc = to_intel_crtc(conn_state->crtc);

/* YCBCR420 TMDS rate requirement is half the pixel clock */ config->hdmi_output = DRM_HDMI_OUTPUT_YCBCR420; @@ -1410,6 +1411,15 @@ intel_hdmi_compute_ycbcr_config(struct drm_connector_state *conn_state, *clock_12bpc /= 2; *clock_8bpc /= 2;

+ /* YCBCR 420 output conversion needs a scaler */ + if (skl_update_scaler_crtc_hdmi_output(config)) { + DRM_ERROR("Scaler allocation for output failed\n"); + return DRM_HDMI_OUTPUT_INVALID; + } + + /* Bind this scaler to pipe */ + intel_pch_panel_fitting(intel_crtc, config, + DRM_MODE_SCALE_FULLSCREEN); }

/* Encoder is capable of this output, lets commit to CRTC */ diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 96c2cbd..b6a32c4 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -110,7 +110,8 @@ intel_pch_panel_fitting(struct intel_crtc *intel_crtc,

/* Native modes don't need fitting */ if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w && - adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h) + adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h && + pipe_config->hdmi_output != DRM_HDMI_OUTPUT_YCBCR420) goto done;

switch (fitting_mode) {

To support ycbcr HDMI output, we need a pipe CSC block to do the RGB->YCBCR conversion, as the blender output is in RGB.

Current Intel platforms have only one pipe CSC unit, so we can either do color correction using it, or we can perform RGB->YCBCR conversion.

This function adds a csc handler, which uses recommended bspec values to perform RGB->YCBCR conversion (target color space BT709)

V2: Rebase V3: Rebase V4: Rebase V5: Addressed review comments from Ander - Remove extra line added in the patch - Add the spec details in the commit message - Combine two if(cond) while calling intel_crtc_compute_config

Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Daniel Vetter daniel.vetter@intel.com Cc: Ander Conselvan de Oliveira conselvan2@gmail.com

Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- drivers/gpu/drm/i915/intel_color.c | 47 +++++++++++++++++++++++++++++++++++- drivers/gpu/drm/i915/intel_display.c | 30 +++++++++++++++++++++++ 2 files changed, 76 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c index 306c6b0..12d5f21 100644 --- a/drivers/gpu/drm/i915/intel_color.c +++ b/drivers/gpu/drm/i915/intel_color.c @@ -41,6 +41,19 @@

#define LEGACY_LUT_LENGTH (sizeof(struct drm_color_lut) * 256)

+/* Post offset values for RGB->YCBCR conversion */ +#define POSTOFF_RGB_TO_YUV_HI 0x800 +#define POSTOFF_RGB_TO_YUV_ME 0x100 +#define POSTOFF_RGB_TO_YUV_LO 0x800 + +/* Direct spec values for RGB->YUV conversion matrix */ +#define CSC_RGB_TO_YUV_RU_GU 0x2ba809d8 +#define CSC_RGB_TO_YUV_BU 0x37e80000 +#define CSC_RGB_TO_YUV_RY_GY 0x1e089cc0 +#define CSC_RGB_TO_YUV_BY 0xb5280000 +#define CSC_RGB_TO_YUV_RV_GV 0xbce89ad8 +#define CSC_RGB_TO_YUV_BV 0x1e080000 + /* * Extract the CSC coefficient from a CTM coefficient (in U32.32 fixed point * format). This macro takes the coefficient we want transformed and the @@ -91,6 +104,35 @@ static void ctm_mult_by_limited(uint64_t *result, int64_t *input) } }

+void i9xx_load_ycbcr_conversion_matrix(struct intel_crtc *intel_crtc) +{ + int pipe = intel_crtc->pipe; + struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev); + + /* We don't use high values for conversion */ + I915_WRITE(PIPE_CSC_PREOFF_HI(pipe), 0); + I915_WRITE(PIPE_CSC_PREOFF_ME(pipe), 0); + I915_WRITE(PIPE_CSC_PREOFF_LO(pipe), 0); + + /* Program direct spec values for RGB to YCBCR conversion matrix */ + I915_WRITE(PIPE_CSC_COEFF_RU_GU(pipe), CSC_RGB_TO_YUV_RU_GU); + I915_WRITE(PIPE_CSC_COEFF_BU(pipe), CSC_RGB_TO_YUV_BU); + + I915_WRITE(PIPE_CSC_COEFF_RY_GY(pipe), CSC_RGB_TO_YUV_RY_GY); + I915_WRITE(PIPE_CSC_COEFF_BY(pipe), CSC_RGB_TO_YUV_BY); + + I915_WRITE(PIPE_CSC_COEFF_RV_GV(pipe), CSC_RGB_TO_YUV_RV_GV); + I915_WRITE(PIPE_CSC_COEFF_BV(pipe), CSC_RGB_TO_YUV_BV); + + /* Spec postoffset values */ + I915_WRITE(PIPE_CSC_POSTOFF_HI(pipe), POSTOFF_RGB_TO_YUV_HI); + I915_WRITE(PIPE_CSC_POSTOFF_ME(pipe), POSTOFF_RGB_TO_YUV_ME); + I915_WRITE(PIPE_CSC_POSTOFF_LO(pipe), POSTOFF_RGB_TO_YUV_LO); + + /* CSC mode before gamma */ + I915_WRITE(PIPE_CSC_MODE(pipe), 0); +} + /* Set up the pipe CSC unit. */ static void i9xx_load_csc_matrix(struct drm_crtc_state *crtc_state) { @@ -101,7 +143,10 @@ static void i9xx_load_csc_matrix(struct drm_crtc_state *crtc_state) uint16_t coeffs[9] = { 0, }; struct intel_crtc_state *intel_crtc_state = to_intel_crtc_state(crtc_state);

- if (crtc_state->ctm) { + if (intel_crtc_state->hdmi_output > DRM_HDMI_OUTPUT_DEFAULT_RGB) { + i9xx_load_ycbcr_conversion_matrix(intel_crtc); + return; + } else if (crtc_state->ctm) { struct drm_color_ctm *ctm = (struct drm_color_ctm *)crtc_state->ctm->data; uint64_t input[9] = { 0, }; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 3f87052..14110bd 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -6260,6 +6260,29 @@ static void intel_crtc_compute_pixel_rate(struct intel_crtc_state *crtc_state) ilk_pipe_pixel_rate(crtc_state); }

+static int intel_crtc_ycbcr_config(struct intel_crtc_state *state) +{ + struct drm_crtc_state *drm_state = &state->base; + struct drm_i915_private *dev_priv = to_i915(drm_state->crtc->dev); + + /* YCBCR420 is supported only in HDMI 2.0 controllers */ + if ((state->hdmi_output == DRM_HDMI_OUTPUT_YCBCR420) && + !IS_GEMINILAKE(dev_priv)) { + DRM_ERROR("YCBCR420 output is not supported\n"); + return -EINVAL; + } + + /* We need CSC for output conversion from RGB->YCBCR */ + if (drm_state->ctm) { + DRM_ERROR("YCBCR output and CTM is not possible together\n"); + return -EINVAL; + } + + DRM_DEBUG_DRIVER("Output %s can be supported\n", + drm_get_hdmi_output_name(state->hdmi_output)); + return 0; +} + static int intel_crtc_compute_config(struct intel_crtc *crtc, struct intel_crtc_state *pipe_config) { @@ -6289,6 +6312,13 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc, return -EINVAL; }

+ /* YCBCR output check */ + if (pipe_config->hdmi_output > DRM_HDMI_OUTPUT_DEFAULT_RGB && + intel_crtc_ycbcr_config(pipe_config)) { + DRM_ERROR("Can't enable YCBCR output\n"); + return -EINVAL; + } + /* * Pipe horizontal size must be even in: * - DVO ganged mode

This patch sets the is_hdmi2_src identifier in drm connector for GLK platform. GLK contains a native HDMI 2.0 controller. This identifier will help the EDID handling functions to save lot of work which is specific to HDMI 2.0 sources.

V3: Added this patch V4: Rebase V4: Rebase V4: Added r-b from Ander

Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Ander Conselvan de Oliveira conselvan2@gmail.com

Reviewed-by: Ander Conselvan de Oliveira conselvan2@gmail.com Signed-off-by: Shashank Sharma shashank.sharma@intel.com --- drivers/gpu/drm/i915/intel_hdmi.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index ba1559e..cb6c658 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -1967,6 +1967,9 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port, connector->doublescan_allowed = 0; connector->stereo_allowed = 1;

+ if (IS_GEMINILAKE(dev_priv)) + connector->ycbcr_420_allowed = true; + intel_hdmi->ddc_bus = intel_hdmi_ddc_pin(dev_priv, port);

switch (port) {