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drm/radeon: 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

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2015-05-18 10:38:25 -04:00
parent 755c814a7d
commit 0f28d1281b
1 changed files with 11 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

20
drivers/gpu/drm/radeon/atombios_dp.c
View file

@ -421,19 +421,21 @@ bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
{ {
struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv; struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
u8 msg[DP_DPCD_SIZE]; u8 msg[DP_DPCD_SIZE];
int ret; int ret, i;
ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg, for (i = 0; i < 7; i++) {
DP_DPCD_SIZE); ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg,
if (ret > 0) { DP_DPCD_SIZE);
memcpy(dig_connector->dpcd, 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), DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
dig_connector->dpcd); dig_connector->dpcd);
radeon_dp_probe_oui(radeon_connector); radeon_dp_probe_oui(radeon_connector);
return true; return true;
}
} }
dig_connector->dpcd[0] = 0; dig_connector->dpcd[0] = 0;
return false; return false;