linux-kernel - Re: [PATCH 6/8] drm/fb-helper: Pass buffer format via drm_fb_helper_surface

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Date:   Fri, 14 Jul 2023 12:25:09 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH 6/8] drm/fb-helper: Pass buffer format via
 drm_fb_helper_surface_size

Geert Uytterhoeven <geert@...ux-m68k.org> writes:

> drm_fb_helper_single_fb_probe() first calls drm_fb_helper_find_sizes(),
> followed by drm_fbdev_generic_helper_fb_probe():
>   - The former tries to find a suitable buffer format, taking into
>     account limitations of the whole display pipeline,
>   - The latter just calls drm_mode_legacy_fb_format() again.
>
> Simplify this by passing the buffer format between these functions
> via a new buffer format member in the drm_fb_helper_surface_size
> structure.
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---

[...]

> -	drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",
> +	drm_info(dev, "surface width(%d), height(%d), bpp(%d) and format(%p4cc)\n",

You are promoting a debug printout here to info but that change is not
mentioned in the commit message. If you think this will be useful, maybe
do it as a separate patch ?

The rest of the patch looks good to me though.

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat