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Commit 33c2de6b authored by Alex Deucher's avatar Alex Deucher Committed by Sasha Levin
Browse files

drm/radeon: retry dcpd fetch 

[ Upstream commit 0f28d1281b6c54cc98746ae61e44e7f540758ed4 ]

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: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent b772265d

drivers/gpu/drm/radeon/atombios_dp.c

+11 −9
Original line number Diff line number Diff line
@@ -405,11 +405,12 @@ bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector) 
{

	struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;

	u8 msg[DP_DPCD_SIZE];

	int ret;

	int ret, i;



	for (i = 0; i < 7; i++) {

		ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg,

				       DP_DPCD_SIZE);

	if (ret > 0) {

		if (ret == DP_DPCD_SIZE) {

			memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);



			DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
@@ -419,6 +420,7 @@ bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector) 


			return true;

		}

	}

	dig_connector->dpcd[0] = 0;

	return false;

}