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

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Message-ID: <47skckagggxijdhinmmibtrd3dydixtj6pccrgjwyczs7bj2te@2rq2iprmzvyf>
Date: Mon, 19 Jan 2026 14:55:54 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <yongxing.mou@....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 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. 

> 
> 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(-)
> 

-- 
With best wishes
Dmitry