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drm/rockchip: cdn-dp: Compliant with eDP receiver enhanced frame capability

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On an eDP connection, the eDP sink must operate only in Enhanced Framing Mode.
The Source must send only Enhanced Framing on the main link, and must only
write a '0' to DPCD 00101h: LANE_COUNT_SET Bit 7: ENHANCED_FRAME_EN bit.

Independent of method used, DP1.2-compliant eDP Receivers shall indicate any
eDP protocol differentiation method they support through the Receiver
Capability Field of DPCD (DPCD:0000Dh).

Change-Id: Ia57f3242c16e2ace0c13076992c2c14eda9e7ca7
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
This commit is contained in:
Wyon Bi
2019-03-27 17:14:46 +08:00
committed by Tao Huang
parent 1b6221e375
commit db9eaf1a4e
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/rockchip/cdn-dp-link-training.c
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@@ -69,7 +69,13 @@ static int cdn_dp_set_pattern(struct cdn_dp_device *dp, uint8_t dp_train_pat)
return ret;
}
if (drm_dp_enhanced_frame_cap(dp->dpcd))
if (drm_dp_enhanced_frame_cap(dp->dpcd) ||
/*
* A setting of 1 indicates that this is an eDP device that uses
* only Enhanced Framing, independently of the setting by the
* source of ENHANCED_FRAME_EN
*/
dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_FRAMING_CHANGE_CAP)
ret = cdn_dp_reg_write(dp, DPTX_ENHNCD, 1);
else
ret = cdn_dp_reg_write(dp, DPTX_ENHNCD, 0);