linux-kernel - [PATCH] drm/bridge: Clear the DP_AUX_I2C

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Message-Id: <20220217071541.1722057-1-hsinyi@chromium.org>
Date:   Thu, 17 Feb 2022 15:15:41 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Xin Ji <xji@...logixsemi.com>, Robert Foss <robert.foss@...aro.org>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <andrzej.hajda@...el.com>
Subject: [PATCH] drm/bridge: Clear the DP_AUX_I2C_MOT bit passed in aux command.

It's observed that if the previous transfer didn't end with a command
without DP_AUX_I2C_MOT, the next trasnfer will miss the first byte. But
if the command in previous transfer is requested with length 0, anx7625
can't process this command. To make the case simpler, request with
commands without DP_AUX_I2C_MOT bit.

Fixes: adca62ec370c ("drm/bridge: anx7625: Support reading edid through aux channel")
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 633618bafd75d3..050616c1162128 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1703,7 +1703,7 @@ static ssize_t anx7625_aux_transfer(struct drm_dp_aux *aux,
 		ret = -EINVAL;
 	}
 	if (!ret)
-		ret = anx7625_aux_trans(ctx, msg->request, msg->address,
+		ret = anx7625_aux_trans(ctx, request, msg->address,
 					msg->size, msg->buffer);
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
-- 
2.35.1.265.g69c8d7142f-goog