linux-kernel - [PATCH v2] drm/amd/display: Fix randomly flicking on overlay with enabled ABM

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Date:   Fri, 24 Sep 2021 09:34:41 +0800
From:   <yipeng.chen@....com>
To:     <harry.wentland@....com>, <sunpeng.li@....com>,
        <alexander.deucher@....com>, <christian.koenig@....com>,
        <airlied@...ux.ie>, <daniel@...ll.ch>, <qingqing.zhuo@....com>,
        <Aric.Cyr@....com>, <Anson.Jacob@....com>, <bindu.r@....com>,
        <martin.tsai@....com>, <bing.guo@....com>, <roy.chan@....com>,
        <george.shen@....com>, <joshua.aberback@....com>,
        <Ashley.Thomas2@....com>, <Jing.Zhou@....com>, <dale.zhao@....com>
CC:     <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <ching-shih.li@....com>,
        "Yipeng Chen (Jasber)" <yipeng.chen@....com>,
        Roman Li <Roman.Li@....com>, Anthony Koo <Anthony.Koo@....com>
Subject: [PATCH v2] drm/amd/display: Fix randomly flicking on overlay with enabled ABM

From: "Yipeng Chen (Jasber)" <yipeng.chen@....com>

[Why]
Enabled ABM (level != 0) would raise short pulse irq DC_IRQ_SOURCE_HPD1RX
randomly with PSR error LINK_CRC_ERROR. Actually there is no hot plugging
on EDP panel. After correcting CRC error, there is no need to send drm
hotplug event.

[How]
Returning false would skip doing hot-plug when handle_hpd_irq_psr_sink()
handled irq. Hot-plug process causes visible flicking on overlay.

Signed-off-by: Yipeng Chen (Jasber) <yipeng.chen@....com>
Reviewed-by: Roman Li <Roman.Li@....com>
Reviewed-by: Anthony Koo <Anthony.Koo@....com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 1e4794e2825c..9b9fbe5e9bd4 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -3007,7 +3007,7 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
 
 	if (handle_hpd_irq_psr_sink(link))
 		/* PSR-related error was detected and handled */
-		return true;
+		return false;
 
 	/* If PSR-related error handled, Main link may be off,
 	 * so do not handle as a normal sink status change interrupt.
-- 
2.25.1