linux-kernel - Re: [PATCH v3] simplefb: Enable boot time VESA graphic mode selection.

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Message-ID: <33b80f9c-d54a-5471-a58b-7a783a7a9e5b@redhat.com>
Date:   Wed, 23 Feb 2022 17:34:50 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Michal Suchanek <msuchanek@...e.de>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Martin Mares <mj@....cz>,
        Helge Deller <deller@....de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Cristian Marussi <cristian.marussi@....com>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Arnd Bergmann <arnd@...db.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        David Herrmann <dh.herrmann@...il.com>,
        linux-kernel@...r.kernel.org, linux-video@...ey.karlin.mff.cuni.cz
Subject: Re: [PATCH v3] simplefb: Enable boot time VESA graphic mode
 selection.

Hello Michal,

On 2/18/22 17:04, Michal Suchanek wrote:
> Since switch to simplefb/simpledrm VESA graphic modes are no longer
> available with legacy BIOS.
>

Maybe you can mention that is the "vga=" kernel command line parameter
since that may be more evident to people reading the commit message ?
 
> The x86 realmode boot code enables the VESA graphic modes when option
> FB_BOOT_VESA_SUPPORT is enabled.
> 
> To enable use of VESA modes with simplefb in legacy BIOS boot mode drop

I think you meant "VESA modes with the sysfb driver" ? or something like
that since otherwise it seems that you meant to use it with the simplefb
(drivers/video/fbdev/simplefb.c) fbdev driver, which doesn't support the
"vga=" param as far as I understand (it just uses whatever was setup).

The name sysfb_simplefb is really horrible, because it is too confusing
and probably we should change it at some point...

Patch itself looks good to me though.

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

Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat