linux-kernel - Re: [PATCH] firmware/sysfb: Fix wrong stride when bits-per-pixel is calculated

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Date:   Wed, 12 Apr 2023 21:34:33 -0400
From:   "Pierre Asselin" <pa@...ix.com>
To:     "Pierre Asselin" <pa@...ix.com>
Cc:     pa@...ix.com, javierm@...hat.com, tzimmermann@...e.de,
        linux-kernel@...r.kernel.org, jfalempe@...hat.com,
        hdegoede@...hat.com, dri-devel@...ts.freedesktop.org,
        daniel.vetter@...ll.ch, ardb@...nel.org
Subject: Re: [PATCH] firmware/sysfb: Fix wrong stride when bits-per-pixel is
 calculated

> (not tested)

Tested.  It fixes the regression on my laptop.

> diff --git a/drivers/firmware/sysfb_simplefb.c
> b/drivers/firmware/sysfb_simplefb.c
> index 82c64cb9f531..9f5299d54732 100644
> --- a/drivers/firmware/sysfb_simplefb.c
> +++ b/drivers/firmware/sysfb_simplefb.c
> @@ -56,10 +56,11 @@ __init bool sysfb_parse_mode(const struct screen_info
> *si,
>  	 * don't specify alpha channels.
>  	 */
>  	if (si->lfb_depth > 8) {
> -		bits_per_pixel = max(max3(si->red_size + si->red_pos,
> +		bits_per_pixel = max3(max3(si->red_size + si->red_pos,
>  					  si->green_size + si->green_pos,
>  					  si->blue_size + si->blue_pos),
> -				     si->rsvd_size + si->rsvd_pos);
> +				     si->rsvd_size + si->rsvd_pos,
> +				     si->lfb_depth);
>  	} else {
>  		bits_per_pixel = si->lfb_depth;
>  	}