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drm/amdgpu: retry dcpd fetch

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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>
This commit is contained in:
Alex Deucher 2015-05-18 18:15:07 -04:00
parent 7af93b5069
commit 67ed009232
1 changed files with 11 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/gpu/drm/amd/amdgpu/atombios_dp.c
View File

@ -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;