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| author | Lewis Huang <Lewis.Huang@amd.com> | 2019-09-05 15:33:58 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-10-10 19:32:03 -0500 |
| commit | f537d474df15393ad25721f5203ce16ed3596d66 (patch) | |
| tree | 3ea2943d295e52b149889bdc9ff0b5c619fbc27c /drivers/gpu/drm/amd/display/dc/core | |
| parent | d832fc3b182045185e3dd92e20ac31c84be68da7 (diff) | |
| download | linux-stable-f537d474df15393ad25721f5203ce16ed3596d66.tar.gz linux-stable-f537d474df15393ad25721f5203ce16ed3596d66.tar.bz2 linux-stable-f537d474df15393ad25721f5203ce16ed3596d66.zip | |
drm/amd/display: check phy dpalt lane count config
[Why]
Type-c PHY config is not align with dpcd lane count.
When those values didn't match, it cause driver do
link training with 4 lane but phy only can output 2 lane.
The link trainig always fail.
[How]
1. Modify get_max_link_cap function. According DPALT_DP4
to update max lane count.
2. Add dp_mst_verify_link_cap to handle MST case because
we didn't call dp_mst_verify_link_cap for MST case.
Signed-off-by: Lewis Huang <Lewis.Huang@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 16 |
2 files changed, 18 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 34213bbd5e68..a560e61992f1 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -872,7 +872,8 @@ bool dc_link_detect_helper(struct dc_link *link, enum dc_detect_reason reason) * empty which leads to allocate_mst_payload() has "0" * pbn_per_slot value leading to exception on dc_fixpt_div() */ - link->verified_link_cap = link->reported_link_cap; + dp_verify_mst_link_cap(link); + if (prev_sink != NULL) dc_sink_release(prev_sink); return false; diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 7c78caf7a602..701b73926616 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -1409,6 +1409,9 @@ static struct dc_link_settings get_max_link_cap(struct dc_link *link) if (link->link_enc->features.flags.bits.IS_HBR3_CAPABLE) max_link_cap.link_rate = LINK_RATE_HIGH3; + if (link->link_enc->funcs->get_max_link_cap) + link->link_enc->funcs->get_max_link_cap(link->link_enc, &max_link_cap); + /* Lower link settings based on sink's link cap */ if (link->reported_link_cap.lane_count < max_link_cap.lane_count) max_link_cap.lane_count = @@ -1670,6 +1673,19 @@ bool dp_verify_link_cap_with_retries( return success; } +bool dp_verify_mst_link_cap( + struct dc_link *link) +{ + struct dc_link_settings max_link_cap = {0}; + + max_link_cap = get_max_link_cap(link); + link->verified_link_cap = get_common_supported_link_settings( + link->reported_link_cap, + max_link_cap); + + return true; +} + static struct dc_link_settings get_common_supported_link_settings( struct dc_link_settings link_setting_a, struct dc_link_settings link_setting_b) |