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drm/bridge: analogix_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).

Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
Change-Id: I38e30426924bed531047a2d41b812d697d9f9838
This commit is contained in:
Wyon Bi
2021-04-13 11:10:38 +08:00
committed by Tao Huang
parent 9622f2d0f1
commit 5d2f3f959e
1 changed files with 14 additions and 0 deletions
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14
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
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@@ -274,6 +274,20 @@ static int analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp)
if (ret < 0)
return ret;
if (!data) {
/*
* 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
*/
ret = drm_dp_dpcd_readb(&dp->aux, DP_EDP_CONFIGURATION_CAP,
&data);
if (ret < 0)
return ret;
data = !!(data & DP_FRAMING_CHANGE_CAP);
}
analogix_dp_enable_enhanced_mode(dp, data);
dp->link_train.enhanced_framing = data;