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

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Message-ID: <8c63a77c-1676-461a-bfcf-55202e723718@oss.qualcomm.com>
Date: Tue, 20 Jan 2026 15:56:10 +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 1/20/2026 11:12 AM, Dmitry Baryshkov wrote:
> On Tue, Jan 20, 2026 at 10:43:46AM +0800, Yongxing Mou wrote:
>>
>>
>> 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 patch is incorrect. It trades working on some platforms (DP) vs
> working of someo ther platforms (eDP). I don't think it is a proper fix
> for any problem.
> 
Got it.. will post refactor series.
>>>>
>>>> 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(-)
>>>>
>>>
>>
>>
>> -- 
>> linux-phy mailing list
>> linux-phy@...ts.infradead.org
>> https://lists.infradead.org/mailman/listinfo/linux-phy
>

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