linux-kernel - Re: [PATCH v2] drm/msm/dp: Correct LeMans/Monaco DP phy Swing/Emphasis setting

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Message-ID: <749e716e-a6cb-4adb-8ffc-0d6f4c6d56c4@oss.qualcomm.com>
Date: Tue, 20 Jan 2026 10:43:46 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Vinod Koul <vkoul@...nel.org>, Neil Armstrong
 <neil.armstrong@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Abel Vesa <abel.vesa@....qualcomm.com>
Subject: Re: [PATCH v2] drm/msm/dp: Correct LeMans/Monaco DP phy
 Swing/Emphasis setting



On 1/19/2026 8:55 PM, Dmitry Baryshkov wrote:
> On Mon, Jan 19, 2026 at 08:37:20PM +0800, Yongxing Mou wrote:
>> Currently, the LeMans/Monaco devices and their derivative platforms
>> operate in DP mode rather than eDP mode. Per the PHY HPG, the Swing and
>> Emphasis settings need to be corrected to the proper values.
> 
> No, they need to be configured dynamically. I wrote earlier that the
> driver needs refactoring.
> 
Hi, Dmitry. I plan to submit them in this order: this patch → LDO patch 
→ refactor.
Since the refactor involves more platforms and may take some time, I’d 
like to get this patch merged first.
>>
>> This will help achieve successful link training on some dongles.
>>
>> Cc: stable@...r.kernel.org
>> Fixes: 3f12bf16213c ("phy: qcom: edp: Add support for eDP PHY on SA8775P")
>> Reviewed-by: Abel Vesa <abel.vesa@....qualcomm.com>
>> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
>> ---
>> Changes in v2:
>> - Separate the LDO change out.[Konrad][Dmitry]
>> - Modify the commit message.[Dmitry]
>> - Link to v1: https://lore.kernel.org/r/20260109-klm_dpphy-v1-1-a6b6abe382de@oss.qualcomm.com
>> ---
>>   drivers/phy/qualcomm/phy-qcom-edp.c | 23 ++++++++++++++++++++++-
>>   1 file changed, 22 insertions(+), 1 deletion(-)
>>
>