Some devices (ATI/AMD cards) don't want passing ELD struct to the hardware but just require filling specific registers and then hardware/firmware does the rest. In such a cases we need to read info from SAD blocks and put them in the correct registers. --- drivers/gpu/drm/drm_edid.c | 55 ++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_edid.h | 24 +++++++++++++++++++ 2 files changed, 79 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index e2acfdb..7c9e799 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2511,6 +2511,61 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) EXPORT_SYMBOL(drm_edid_to_eld);
/** + * drm_edid_to_sad - extracts SADs from EDID + * @edid: EDID to parse + * + * Looks for CEA EDID block and extracts SADs (Short Audio Descriptors) from it. + */ +struct cea_sad *drm_edid_to_sad(struct edid *edid) +{ + struct cea_sad *sads = NULL; + int i, start, end, dbl; + u8 *db, *cea; + + cea = drm_find_cea_extension(edid); + if (!cea) { + DRM_DEBUG_KMS("SAD: no CEA Extension found\n"); + return NULL; + } + + if (cea_revision(cea) < 3) { + DRM_DEBUG_KMS("SAD: wrong CEA revision\n"); + return NULL; + } + + if (cea_db_offsets(cea, &start, &end)) { + DRM_DEBUG_KMS("SAD: invalid data block offsets\n"); + return NULL; + } + + for_each_cea_db(cea, i, start, end) { + db = &cea[i]; + dbl = cea_db_payload_len(db); + + if (cea_db_tag(db) == AUDIO_BLOCK) { + int count = dbl / 3; /* SAD is 3B */ + int j; + + sads = kzalloc(count + 1 * sizeof(*sads), GFP_KERNEL); + if (!sads) + return NULL; + + for (j = 0; j < count; j++) { + u8 *sad = &db[1 + j * 3]; + + sads[j].format = (sad[0] & 0x78) >> 3; + sads[j].channels = sad[0] & 0x7; + sads[j].freq = sad[1] & 0x7F; + sads[j].byte2 = sad[2]; + } + } + } + + return sads; +} +EXPORT_SYMBOL(drm_edid_to_sad); + +/** * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond * @connector: connector associated with the HDMI/DP sink * @mode: the display mode diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index 5da1b4a..b36d052 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -244,12 +244,36 @@ struct edid {
#define EDID_PRODUCT_ID(e) ((e)->prod_code[0] | ((e)->prod_code[1] << 8))
+#define SAD_FORMAT_LPCM 0x01 +#define SAD_FORMAT_AC3 0x02 +#define SAD_FORMAT_MPEG1 0x03 +#define SAD_FORMAT_MP3 0x04 +#define SAD_FORMAT_MPEG2 0x05 +#define SAD_FORMAT_AAC 0x06 +#define SAD_FORMAT_DTS 0x07 +#define SAD_FORMAT_ATRAC 0x08 +#define SAD_FORMAT_ONE_BIT_AUDIO 0x09 +#define SAD_FORMAT_DOLBY_DIGITAL 0x0a +#define SAD_FORMAT_DTS_HD 0x0b +#define SAD_FORMAT_MAT_MLP 0x0c +#define SAD_FORMAT_DST 0x0d +#define SAD_FORMAT_WMA_PRO 0x0e + +/* Short Audio Descriptor */ +struct cea_sad { + u8 format; + u8 channels; /* max number of channels - 1 */ + u8 freq; + u8 byte2; /* meaning depends on format */ +}; + struct drm_encoder; struct drm_connector; struct drm_display_mode; struct hdmi_avi_infoframe;
void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid); +struct cea_sad *drm_edid_to_sad(struct edid *edid); int drm_av_sync_delay(struct drm_connector *connector, struct drm_display_mode *mode); struct drm_connector *drm_select_eld(struct drm_encoder *encoder,