Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d30df55b authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/radeon/dp: sleep after powering up the display 



According to the DP 1.1 spec, the sink must power
up within 1ms.  Noticed while reviewing Thierry's
drm/dp patches.

Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent ab9f51c0

drivers/gpu/drm/radeon/atombios_dp.c

+3 −1
Original line number Diff line number Diff line
@@ -673,9 +673,11 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info) 
	u8 tmp;



	/* power up the sink */

	if (dp_info->dpcd[0] >= 0x11)

	if (dp_info->dpcd[0] >= 0x11) {

		radeon_write_dpcd_reg(dp_info->radeon_connector,

				      DP_SET_POWER, DP_SET_POWER_D0);

		usleep_range(1000, 2000);

	}



	/* possibly enable downspread on the sink */

	if (dp_info->dpcd[3] & 0x1)