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drm: bridge: dw-hdmi: support workaround to clear the overflow condition on rockchip platform

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Under some circumstances the Frame Composer arithmetic unit can miss
an FC register write due to being busy processing the previous one.

The issue can be worked around by issuing a TMDS software reset and
then write one of the FC registers several times. After tested, the
number of iterations of RK3399/RK3328(v2.11a), RK3368(v2.01a),
RK3288(v2.00a) is one.

Change-Id: Iba209e25d56aff84a8cc90b4d8dcb87369c9ae52
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
This commit is contained in:
Zheng Yang 2017-09-12 14:49:34 +08:00 committed by Algea Cao
parent 87213ab49a
commit 8d4a22b562
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
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@ -1662,8 +1662,9 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
count = 4;
break;
case 0x131a:
case 0x132a:
case 0x200a:
case 0x201a:
case 0x211a:
count = 1;
break;
default: