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

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Message-ID: <f530844d-70f2-c3cc-d5f6-b435f1dbdfd2@gmail.com>
Date:   Wed, 10 Jul 2019 15:59:55 +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 15:55, Maxime Ripard пишет:
> 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 ?

tegraid=30.1.3.0.0 mem=1022M@...8M android.commchip=0 vmalloc=512M androidboot.serialno=015d3f18c9081210 video=tegrafb no_console_suspend=1 console=none
debug_uartport=hsport usbcore.old_scheme_first=1 lp0_vec=8192@...ddf9000 tegra_fbmem=8195200@...be01000 core_edp_mv=0 audio_codec=rt5640 board_info=f41:a00:1:44:2
root=/dev/sda1 rw rootwait tegraboot=sdmmc gpt gpt_sector=61079551 androidboot.bootloader=4.23 androidboot.baseband=1231_0.18.0_0409