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>
{
struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
u8 msg[DP_DPCD_SIZE];
{
struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
u8 msg[DP_DPCD_SIZE];
- 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);
}
dig_connector->dpcd[0] = 0;
return -EINVAL;
}
dig_connector->dpcd[0] = 0;
return -EINVAL;