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>
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@ -673,9 +673,11 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
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u8 tmp;
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/* power up the sink */
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if (dp_info->dpcd[0] >= 0x11)
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if (dp_info->dpcd[0] >= 0x11) {
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radeon_write_dpcd_reg(dp_info->radeon_connector,
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DP_SET_POWER, DP_SET_POWER_D0);
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usleep_range(1000, 2000);
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}
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/* possibly enable downspread on the sink */
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if (dp_info->dpcd[3] & 0x1)
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