From: Alex Deucher Date: Tue, 14 Jan 2014 15:45:51 +0000 (-0500) Subject: drm/radeon/dp: sleep after powering up the display X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d30df55b3ec069283408b6d3b013bcba52dd03dc;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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: Alex Deucher --- diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index 403ca00b8a55..4ad7643fce5f 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -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)