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From: Frank Wunderlich <frank-w@public-files.de>
To: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: chunkuang Hu <chunkuang.hu@kernel.org>,
	Dafna Hirschfeld <dafna.hirschfeld@collabora.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Enric Balletbo i Serra <enric.balletbo@collabora.com>,
	David Airlie <airlied@linux.ie>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@lists.infradead.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Collabora Kernel ML <kernel@collabora.com>,
	Matthias Brugger <matthias.bgg@gmail.com>
Subject: Aw: Re: Re: Re: BUG: MTK DRM/HDMI broken on 5.13 (mt7623/bpi-r2)
Date: Mon, 12 Jul 2021 10:11:08 +0200	[thread overview]
Message-ID: <trinity-2d1b055a-73b0-4a15-9677-08fd13fd486d-1626077468706@3c-app-gmx-bs28> (raw)
In-Reply-To: <CAAOTY_-yi5NP_U-m==ZHeBNC9-6NrjUacKWdmmgVXZjH+sFZKw@mail.gmail.com>

Hi,

HDMI is broken again in 5.14-rc1 (of course i have applied my patch [1])

now i've got a NULL pointer dereference

[   21.883641] PC is at mtk_dpi_bridge_atomic_check+0x38/0x78
[   21.889158] LR is at drm_atomic_bridge_chain_check+0x150/0x30c

"dpi" is  not set correctly in mtk_dpi_bridge_atomic_check

this function is new since

commit ec8747c52434b69cea2b18068e72f051e23d3839
    drm/mediatek: dpi: Add bus format negotiation

i do not see where bridge->driver_private is set, but in other function it is solved like this:

bridge_to_dpi(bridge)

this fixes the NULL-pointer dereference, and system starts to xserver, but i do not see fbcon...it looks like drm is now initialized later (~ at login prompt on serial console). i stopped lightdm and still do not see loginprompt on hdmi, so it looks like fbcon is broken

send out fix for NULL issue, but fbcon ist still unclear...but i see this in dmesg:

dmesg | grep -i fbcon
[    0.000000] Kernel command line: root=/dev/mmcblk0p2 rw rootwait earlyprintk console=ttyS0,115200 video=1280x1024 console=tty1 fbcon=map:0
[    0.000000] Unknown command line parameters: fbcon=map:0
[    7.040167]     fbcon=map:0

and no framebuffer/fb0 in dmesg

regards Frank

[1] https://patchwork.kernel.org/project/linux-mediatek/patch/20210710132431.265985-1-linux@fw-web.de/

      reply	other threads:[~2021-07-12  9:04 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-06  9:54 BUG: MTK DRM/HDMI broken on 5.13 (mt7623/bpi-r2) Frank Wunderlich
2021-07-06 11:20 ` Daniel Vetter
2021-07-06 11:40   ` Aw: " Frank Wunderlich
2021-07-07 14:58     ` Chun-Kuang Hu
2021-07-07 15:03     ` Chun-Kuang Hu
2021-07-07 16:33       ` Aw: " Frank Wunderlich
2021-07-08  7:22 ` Dafna Hirschfeld
2021-07-08  8:00   ` Aw: " Frank Wunderlich
2021-07-08  9:35   ` Frank Wunderlich
2021-07-08 12:30     ` Dafna Hirschfeld
2021-07-08 14:01       ` Aw: " Frank Wunderlich
2021-07-08 15:31     ` Aw: " Frank Wunderlich
2021-07-09 10:02       ` Frank Wunderlich
2021-07-09 10:24         ` Enric Balletbo Serra
2021-07-09 10:38           ` Aw: " Frank Wunderlich
2021-07-09 11:28             ` Frank Wunderlich
2021-07-09 16:53               ` Chun-Kuang Hu
2021-07-12  8:11                 ` Frank Wunderlich [this message]

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