linux-kernel - Re: [PATCH v4 1/4] drm/msm/dp: Fix support of LTTPR initialization

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Message-ID: <b3e9650d-906f-4b03-82dc-9e8c09cab226@quicinc.com>
Date: Fri, 2 May 2025 16:01:35 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
CC: Aleksandrs Vinarskis <alex.vinarskis@...il.com>,
        Dmitry Baryshkov
	<lumag@...nel.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Rob Clark
	<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Simona
 Vetter" <simona@...ll.ch>,
        <laurentiu.tudor1@...l.com>, <abel.vesa@...aro.org>,
        <johan@...nel.org>, Johan Hovold
	<johan+linaro@...nel.org>
Subject: Re: [PATCH v4 1/4] drm/msm/dp: Fix support of LTTPR initialization



On 5/2/2025 2:54 PM, Dmitry Baryshkov wrote:
> On Fri, May 02, 2025 at 10:41:41AM -0700, Jessica Zhang wrote:
>>
>>
>> On 4/29/2025 5:09 PM, Aleksandrs Vinarskis wrote:
>>> Initialize LTTPR before msm_dp_panel_read_sink_caps, as DPTX shall
>>> (re)read DPRX caps after LTTPR detection, as required by DP 2.1,
>>> Section 3.6.7.6.1.
>>>
>>> Fixes: 72d0af4accd9 ("drm/msm/dp: Add support for LTTPR handling")
>>>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>>> Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
>>> Tested-by: Johan Hovold <johan+linaro@...nel.org>
>>> Tested-by: Rob Clark <robdclark@...il.com>
>>
>> Hi Aleksandrs,
>>
>> For this patch and the rest of the series:
>>
>> Tested-by: Jessica Zhang <quic_jesszhan@...cinc.com> # SA8775P
> 
> Were you testing in a setup with LTTPRs?

Hi Dmitry,

No, I have a setup with MST so I re-verified SST and MST with these changes.

Thanks,

Jessica Zhang

>