linux-kernel - Re: [PATCH v4 3/7] drm/msm/mdp4: register the LVDS PLL as a clock provider

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Message-ID: <7568f022-405e-4289-8448-f74d519066a1@quicinc.com>
Date: Fri, 25 Apr 2025 12:53:25 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Rob Clark
	<robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Sean
 Paul" <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Konrad Dybcio
	<konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v4 3/7] drm/msm/mdp4: register the LVDS PLL as a clock
 provider



On 4/25/2025 2:51 AM, Dmitry Baryshkov wrote:
> From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> 
> The LVDS/LCDC controller uses pixel clock coming from the multimedia
> controller (mmcc) rather than using the PLL directly. Stop using LVDS
> PLL directly and register it as a clock provider. Use lcdc_clk as a
> pixel clock for the LCDC.
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>   drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h          |  2 +-
>   drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c |  3 +-
>   drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_pll.c     | 45 ++++++++++++++++-------
>   3 files changed, 34 insertions(+), 16 deletions(-)
> 


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