linux-kernel - Re: [PATCH/RFC 2/3] drm/simple-kms-helper: Add mode

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Date:   Mon, 28 Nov 2022 09:21:08 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Helge Deller <deller@....de>,
        Michael Schmitz <schmitzmic@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC 2/3] drm/simple-kms-helper: Add mode_fixup() to
 simple display pipe

Hi,

On Fri, Nov 25, 2022 at 09:31:09PM +0100, Geert Uytterhoeven wrote:
> From: Thomas Zimmermann <tzimmermann@...e.de>
> 
> The mode fix-up function for simple display helpers is equivalent to the
> regular pipeline's CRTC mode fix-up function. It's called to adjust the
> CRTC's display mode for the encoder. Add this function for DRM fbconv
> helpers.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

It's not clear to me why you'd need a mode_fixup in the first place.
Like said in the documentation you added, atomic_check is usually the
better option for the atomic modesetting drivers.

So, why is it needed?

Maxime

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