linux-kernel - Re: [PATCH v5 08/13] drm/stm: ltdc: handle lvds pixel clock

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Message-ID: <676469fd-b957-79f5-9483-749c66bdf270@foss.st.com>
Date: Thu, 28 Aug 2025 15:53:25 +0200
From: Philippe CORNU <philippe.cornu@...s.st.com>
To: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
        Yannick Fertre
	<yannick.fertre@...s.st.com>,
        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>,
        "Maxime
 Coquelin" <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Christophe Roullier
	<christophe.roullier@...s.st.com>
CC: <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 08/13] drm/stm: ltdc: handle lvds pixel clock



On 8/22/25 16:34, Raphael Gallais-Pou wrote:
> From: Yannick Fertre <yannick.fertre@...s.st.com>
> 
> Handle LVDS pixel clock.
> 
> The LTDC operates with multiple clock domains for register access,
> requiring all clocks to be provided during read/write operations.  This
> imposes a dependency between the LVDS and LTDC to access correctly all
> LTDC registers.  And because both IPs' pixel rates must be synchronized,
> the LTDC has to handle the LVDS clock.
> 
> Signed-off-by: Yannick Fertre <yannick.fertre@...s.st.com>
> Acked-by: Yannick Fertre <yannick.fertre@...s.st.com>
> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
> ---
>   drivers/gpu/drm/stm/ltdc.c | 22 +++++++++++++++++++++-
>   drivers/gpu/drm/stm/ltdc.h |  1 +
>   2 files changed, 22 insertions(+), 1 deletion(-)

Hi Raphael,

Acked-by: Philippe Cornu <philippe.cornu@...s.st.com>

Thanks a lot
Philippe :-)