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

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Message-ID: <4ad69d15-07f8-9753-72d6-a51402c94c20@gmail.com>
Date:   Wed, 10 Jul 2019 15:42:28 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Maxime Ripard <maxime.ripard@...tlin.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

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.