linux-kernel - Re: [PATCH v1] drm/msms/dp: fixed link clock divider bits be over written in BPC unknown case

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Date: Wed, 10 Jan 2024 15:39:00 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Kuogee Hsieh <quic_khsieh@...cinc.com>, <dri-devel@...ts.freedesktop.org>,
        <robdclark@...il.com>, <sean@...rly.run>, <swboyd@...omium.org>,
        <dianders@...omium.org>, <vkoul@...nel.org>, <daniel@...ll.ch>,
        <airlied@...il.com>, <agross@...nel.org>,
        <dmitry.baryshkov@...aro.org>, <andersson@...nel.org>
CC: <quic_jesszhan@...cinc.com>, <quic_sbillaka@...cinc.com>,
        <marijn.suijten@...ainline.org>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] drm/msms/dp: fixed link clock divider bits be over
 written in BPC unknown case



On 1/10/2024 12:18 PM, Kuogee Hsieh wrote:
> Since the value of DP_TEST_BIT_DEPTH_8 is already left shifted, in the
> BPC unknown case, the additional shift causes spill over to the other
> bits of the [DP_CONFIGURATION_CTRL] register.
> Fix this by changing the return value of dp_link_get_test_bits_depth()
> in the BPC unknown case to (DP_TEST_BIT_DEPTH_8 >> DP_TEST_BIT_DEPTH_SHIFT).
> 
> Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/dp/dp_ctrl.c |  5 -----
>   drivers/gpu/drm/msm/dp/dp_link.c | 10 +++++++---
>   2 files changed, 7 insertions(+), 8 deletions(-)
> 

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>