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Message-ID: <340afb94-9c08-46ef-0514-9da52162b45c@suse.de>
Date: Thu, 13 Jul 2023 12:06:47 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Javier Martinez Canillas <javierm@...hat.com>,
linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH] drm/ssd130x: Change pixel format used to compute the
buffer size
Am 13.07.23 um 10:58 schrieb Javier Martinez Canillas:
> The commit e254b584dbc0 ("drm/ssd130x: Remove hardcoded bits-per-pixel in
> ssd130x_buf_alloc()") used a pixel format info instead of a hardcoded bpp
> to calculate the size of the buffer allocated to store the native pixels.
>
> But that wrongly used the DRM_FORMAT_C1 fourcc pixel format, which is for
> color-indexed frame buffer formats. While the ssd103x controllers don't
> support different single-channel colors nor a Color Lookup Table (CLUT).
Makes sense to me.
Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
>
> Both formats use eight pixels/byte, so in practice there is no functional
> changes in this patch. But still the correct pixel format should be used.
>
> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
>
> drivers/gpu/drm/solomon/ssd130x.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
> index b3dc1ca9dc10..afb08a8aa9fc 100644
> --- a/drivers/gpu/drm/solomon/ssd130x.c
> +++ b/drivers/gpu/drm/solomon/ssd130x.c
> @@ -153,7 +153,7 @@ static int ssd130x_buf_alloc(struct ssd130x_device *ssd130x)
> const struct drm_format_info *fi;
> unsigned int pitch;
>
> - fi = drm_format_info(DRM_FORMAT_C1);
> + fi = drm_format_info(DRM_FORMAT_R1);
> if (!fi)
> return -EINVAL;
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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