diff options
| author | Alex Deucher <alexander.deucher@amd.com> | 2014-01-14 10:45:51 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2014-01-20 12:05:19 -0500 |
| commit | d30df55b3ec069283408b6d3b013bcba52dd03dc (patch) | |
| tree | 8ea3ba7289921e9fe6ae354a10eb31d8c09853c8 | |
| parent | ab9f51c09f32351ccaaa6ab494edf07a16d3dd2a (diff) | |
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>
| -rw-r--r-- | drivers/gpu/drm/radeon/atombios_dp.c | 4 |
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 403ca00b8a5..4ad7643fce5 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) |