diff options
| author | Ray Wu <ray.wu@amd.com> | 2026-01-20 16:55:43 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2026-02-03 16:40:03 -0500 |
| commit | e121ccca8a4a5dd6fb5d395de6ef31ebfce7fb38 (patch) | |
| tree | a80c3f587beab660932febebc2d8d36323f06586 /drivers/gpu | |
| parent | 0054d5a57a98c1a6783ffd9c8b7ceda8f8bb46d1 (diff) | |
| download | linux-e121ccca8a4a5dd6fb5d395de6ef31ebfce7fb38.tar.gz linux-e121ccca8a4a5dd6fb5d395de6ef31ebfce7fb38.zip | |
drm/amd/display: Fix IGT ILR link training failure on Replay panel
[Why & How]
Fix the IGT ilr_link-training-configs test failure
by directly using the supported link rates from DPCD.
Reviewed-by: ChiaHsuan Chung <chiahsuan.chung@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index 5fb573214f18..cfe35442dfcb 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -46,6 +46,7 @@ #include "amdgpu_dm_psr.h" #endif +#define MULTIPLIER_TO_LR 270000 struct dmub_debugfs_trace_header { uint32_t entry_count; uint32_t reserved[3]; @@ -3507,6 +3508,10 @@ static ssize_t edp_ilr_write(struct file *f, const char __user *buf, uint8_t param_nums = 0; long param[2]; bool valid_input = true; + uint8_t supported_link_rates[16] = {0}; + uint32_t entry = 0; + uint32_t link_rate_in_khz = 0; + uint8_t dpcd_rev = 0; if (size == 0) return -EINVAL; @@ -3551,6 +3556,20 @@ static ssize_t edp_ilr_write(struct file *f, const char __user *buf, return size; } + if (!dm_helpers_dp_read_dpcd(link->ctx, link, DP_SUPPORTED_LINK_RATES, + supported_link_rates, sizeof(supported_link_rates))) + return -EINVAL; + + dpcd_rev = link->dpcd_caps.dpcd_rev.raw; + if (dpcd_rev < DP_DPCD_REV_13 || + (supported_link_rates[entry + 1] == 0 && supported_link_rates[entry] == 0)) { + return size; + } + + entry = param[1] * 2; + link_rate_in_khz = (supported_link_rates[entry + 1] * 0x100 + + supported_link_rates[entry]) * 200; + /* save user force lane_count, link_rate to preferred settings * spread spectrum will not be changed */ @@ -3558,7 +3577,7 @@ static ssize_t edp_ilr_write(struct file *f, const char __user *buf, prefer_link_settings.lane_count = param[0]; prefer_link_settings.use_link_rate_set = true; prefer_link_settings.link_rate_set = param[1]; - prefer_link_settings.link_rate = link->dpcd_caps.edp_supported_link_rates[param[1]]; + prefer_link_settings.link_rate = link_rate_in_khz / MULTIPLIER_TO_LR; mutex_lock(&adev->dm.dc_lock); dc_link_set_preferred_training_settings(dc, &prefer_link_settings, |