linux-kernel - Re: [PATCH v1] drm/modes: Skip invalid cmdline mode

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Message-ID: <20190710125552.qvmnh6qs63ikiu2k@flea>
Date:   Wed, 10 Jul 2019 14:55:52 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] drm/modes: Skip invalid cmdline mode

On Wed, Jul 10, 2019 at 03:42:28PM +0300, Dmitry Osipenko wrote:
> 10.07.2019 13:12, Maxime Ripard пишет:
> > On Tue, Jul 09, 2019 at 05:51:51PM +0300, Dmitry Osipenko wrote:
> >> The named mode could be invalid and then cmdline parser misses to validate
> >> mode's dimensions, happily adding 0x0 mode as a valid mode. One case where
> >> this happens is NVIDIA Tegra devices that are using downstream bootloader
> >> which adds "video=tegrafb" to the kernel's cmdline and thus upstream Tegra
> >> DRM driver fails to probe because of the invalid mode.
> >>
> >> Fixes: 3aeeb13d8996 ("drm/modes: Support modes names on the command line")
> >> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> >
> > Applied to drm-misc-next-fixes
> >
> > Thanks for figuring this out!
>
> Thank you very much! So the driver now doesn't fail to probe because
> of the cmdline, but what else I noticed is that the framebuffer
> console is now rotated by 90° on a 800x1280 panel, while display in
> Xorg is vertical as it was before. Seems something else is still
> missing, reverting "drm/modes: Rewrite the command line parser"
> returns the framebuffer's console orientation into the original
> state.

What is the whole command line passed by the bootloader ?

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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