On 2019-12-23 12:03 p.m., Animesh Manna wrote:
During phy compliance auto test mode source need to read requested test pattern from sink through DPCD. After processing the request source need to set the pattern. So set/get method added in drm layer as it is DP protocol.
v2: As per review feedback from Manasi on RFC version,
- added dp revision as function argument in set_phy_pattern api.
- used int for link_rate and u8 for lane_count to align with existing code.
Signed-off-by: Animesh Manna animesh.manna@intel.com
drivers/gpu/drm/drm_dp_helper.c | 93 +++++++++++++++++++++++++++++++++ include/drm/drm_dp_helper.h | 31 +++++++++++ 2 files changed, 124 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 2c7870aef469..91c80973aa83 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -1371,3 +1371,96 @@ int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_S return num_bpc; } EXPORT_SYMBOL(drm_dp_dsc_sink_supported_input_bpcs);
+/**
- drm_dp_get_phy_test_pattern() - get the requested pattern from the sink.
- @aux: DisplayPort AUX channel
- @data: DP phy compliance test parameters.
- Returns 0 on success or a negative error code on failure.
- */
+int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux,
struct drm_dp_phy_test_params *data)+{
- int err;
- u8 rate, lanes;
- err = drm_dp_dpcd_readb(aux, DP_TEST_LINK_RATE, &rate);
- if (err < 0)
return err;- data->link_rate = drm_dp_bw_code_to_link_rate(rate);
- err = drm_dp_dpcd_readb(aux, DP_TEST_LANE_COUNT, &lanes);
- if (err < 0)
return err;- data->num_lanes = lanes & DP_MAX_LANE_COUNT_MASK;
- if (lanes & DP_ENHANCED_FRAME_CAP)
data->enahanced_frame_cap = true;- err = drm_dp_dpcd_readb(aux, DP_PHY_TEST_PATTERN, &data->phy_pattern);
- if (err < 0)
return err;- switch (data->phy_pattern) {
- case DP_PHY_TEST_PATTERN_80BIT_CUSTOM:
err = drm_dp_dpcd_read(aux, DP_TEST_80BIT_CUSTOM_PATTERN_7_0,&data->custom80, 10);
Using sizeof(data->custom80) might be safer.
if (err < 0)return err;break;- case DP_PHY_TEST_PATTERN_CP2520:
err = drm_dp_dpcd_read(aux, DP_TEST_HBR2_SCRAMBLER_RESET,&data->hbr2_reset, 2);
Same here, using sizeof(data->hbr2_reset).
if (err < 0)return err;- }
- return 0;
+} +EXPORT_SYMBOL(drm_dp_get_phy_test_pattern);
+/**
- drm_dp_set_phy_test_pattern() - set the pattern to the sink.
- @aux: DisplayPort AUX channel
- @data: DP phy compliance test parameters.
- Returns 0 on success or a negative error code on failure.
- */
+int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux,
struct drm_dp_phy_test_params *data, u8 dp_rev)+{
- int err, i;
- u8 link_config[2];
- u8 test_pattern;
- link_config[0] = drm_dp_link_rate_to_bw_code(data->link_rate);
- link_config[1] = data->num_lanes;
- if (data->enahanced_frame_cap)
link_config[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;- err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, link_config, 2);
- if (err < 0)
return err;- test_pattern = data->phy_pattern;
- if (dp_rev < 0x12) {
test_pattern = (test_pattern << 2) &DP_LINK_QUAL_PATTERN_11_MASK;err = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET,test_pattern);if (err < 0)return err;- } else {
for (i = 0; i < data->num_lanes; i++) {err = drm_dp_dpcd_writeb(aux,DP_LINK_QUAL_LANE0_SET + i,test_pattern);if (err < 0)return err;}- }
- return 0;
+} +EXPORT_SYMBOL(drm_dp_set_phy_test_pattern); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index d6e560870fb1..42a364748308 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -700,6 +700,15 @@ # define DP_TEST_COUNT_MASK 0xf
#define DP_PHY_TEST_PATTERN 0x248 +# define DP_PHY_TEST_PATTERN_SEL_MASK 0x7 +# define DP_PHY_TEST_PATTERN_NONE 0x0 +# define DP_PHY_TEST_PATTERN_D10_2 0x1 +# define DP_PHY_TEST_PATTERN_ERROR_COUNT 0x2 +# define DP_PHY_TEST_PATTERN_PRBS7 0x3 +# define DP_PHY_TEST_PATTERN_80BIT_CUSTOM 0x4 +# define DP_PHY_TEST_PATTERN_CP2520 0x5
+#define DP_TEST_HBR2_SCRAMBLER_RESET 0x24A #define DP_TEST_80BIT_CUSTOM_PATTERN_7_0 0x250 #define DP_TEST_80BIT_CUSTOM_PATTERN_15_8 0x251 #define DP_TEST_80BIT_CUSTOM_PATTERN_23_16 0x252 @@ -1570,4 +1579,26 @@ static inline void drm_dp_cec_unset_edid(struct drm_dp_aux *aux)
#endif
+/**
- struct drm_dp_phy_test_params - DP Phy Compliance parameters
- @link: Link information.
@link seems to be from a previous patch version. Please describe link_rate and num_lanes instead.
- @phy_pattern: DP Phy test pattern from DPCD 0x248 (sink)
- @hb2_reset: DP HBR2_COMPLIANCE_SCRAMBLER_RESET from DCPD
0x24A and 0x24B (sink)
- @custom80: DP Test_80BIT_CUSTOM_PATTERN from DPCDs 0x250
through 0x259.
Missing doc for enhanced_frame_cap.
- */
+struct drm_dp_phy_test_params {
- int link_rate;
Is there a reason you're not using u8 here? Would be nice to keep it consistent with num_lanes.
- u8 num_lanes;
- u8 phy_pattern;
- u8 hbr2_reset[2];
- u8 custom80[10];
- bool enahanced_frame_cap;
Typo. Should be enhanved_frame_cap.
Harry
+};
+int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux,
struct drm_dp_phy_test_params *data);+int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux,
struct drm_dp_phy_test_params *data, u8 dp_rev);#endif /* _DRM_DP_HELPER_H_ */