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authorAlex Deucher <alexander.deucher@amd.com>2014-01-14 19:45:51 +0400
committerAlex Deucher <alexander.deucher@amd.com>2014-01-20 21:05:19 +0400
commitd30df55b3ec069283408b6d3b013bcba52dd03dc (patch)
tree8ea3ba7289921e9fe6ae354a10eb31d8c09853c8 /drivers/gpu/drm/radeon/atombios_dp.c
parentab9f51c09f32351ccaaa6ab494edf07a16d3dd2a (diff)
downloadlinux-d30df55b3ec069283408b6d3b013bcba52dd03dc.tar.xz
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 <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/atombios_dp.c')
-rw-r--r--drivers/gpu/drm/radeon/atombios_dp.c4
1 files changed, 3 insertions, 1 deletions
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)