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Commit 0f28d128 authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/radeon: 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



Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
parent 755c814a

drivers/gpu/drm/radeon/atombios_dp.c

+11 −9
Original line number Original line Diff line number Diff line
@@ -421,11 +421,12 @@ 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;





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

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

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

				       DP_DPCD_SIZE);

				       DP_DPCD_SIZE);

	if (ret > 0) {

		if (ret == DP_DPCD_SIZE) {

			memcpy(dig_connector->dpcd, msg, 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),
@@ -435,6 +436,7 @@ bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector) 




			return true;

			return true;

		}

		}

	}

	dig_connector->dpcd[0] = 0;

	dig_connector->dpcd[0] = 0;

	return false;

	return false;

}

}