diff options
| author | Alex Deucher <alexander.deucher@amd.com> | 2015-05-18 18:15:07 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2015-05-19 16:15:26 -0400 |
| commit | 62622ddeac99eec7b973fdd76f9644b7932ebf60 (patch) | |
| tree | d008fa9e048250a0de9f9b150b50047baf5c0984 | |
| parent | a668a42986aa9110ca9971ce5645c0ea9779032f (diff) | |
drm/amdgpu: retry dcpd fetch
Retry the dpcd fetch several times. Some eDP panels
fail several times before the fetch is successful.
bug:
https://bugs.freedesktop.org/show_bug.cgi?id=73530
Ported from radeon.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c index d54c4b81f0f3..9ba0a7d5bc8e 100644 --- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c +++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c @@ -358,19 +358,21 @@ int amdgpu_atombios_dp_get_dpcd(struct amdgpu_connector *amdgpu_connector) { struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv; u8 msg[DP_DPCD_SIZE]; - int ret; + int ret, i; - ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_DPCD_REV, msg, - DP_DPCD_SIZE); - if (ret > 0) { - memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE); + for (i = 0; i < 7; i++) { + ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_DPCD_REV, msg, + DP_DPCD_SIZE); + if (ret == DP_DPCD_SIZE) { + memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE); - DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd), - dig_connector->dpcd); + DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd), + dig_connector->dpcd); - amdgpu_atombios_dp_probe_oui(amdgpu_connector); + amdgpu_atombios_dp_probe_oui(amdgpu_connector); - return 0; + return 0; + } } dig_connector->dpcd[0] = 0; return -EINVAL; |