Re: vc4 on rpi3 A+

From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Sergey Suloev <ssuloev@orpaltech.com>,
	 linux-rpi-kernel@lists.infradead.org
Cc: "Stefan Wahren" <stefan.wahren@i2se.com>,
	"Noralf Trønnes" <noralf@tronnes.org>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: vc4 on rpi3 A+
Date: Thu, 20 Feb 2020 10:25:46 +0100	[thread overview]
Message-ID: <4850fa1006d5a329c2e6d4e61ec6fb9420125414.camel@suse.de> (raw)
In-Reply-To: <8b353626-f62a-2aff-96b4-91712ed36095@orpaltech.com>

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Hi Sergey,

On Thu, 2020-02-20 at 11:21 +0300, Sergey Suloev wrote:
> Hello, guys,
> 
> could anyone clarify the status of vc4 drm support on RPI 3A+ ?

I don't have one so I can't really tell for that specific board, but I'm going
to try to reproduce it on a rpi3b.

> I tried to build kernel 5.5 and 5.6-rc2 in 32bit and aarch64 
> configurations with VC4 turned ON but both unsuccessful - vc4 drm driver 
> is listed in memory but not working and not producing any typical DRM 
> log output.

AFAIK there is a known issue in 5.6-rc2, which has already been addressed[1].
Note that the driver fails on probe so there is some amount of DRM output.

I tried to reproduce your issue with v5.5, but vc4 seems to probe alright
(rpi3b+aarch64+defconfig):

	[   15.443047] vc4_hdmi 3f902000.hdmi: vc4-hdmi-hifi <-> 3f902000.hdmi mapping ok
	[   15.452864] vc4_hdmi 3f902000.hdmi: ASoC: no DMI vendor name!
	[   15.459836] vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4])
	[   15.467062] vc4-drm soc:gpu: bound 3f806000.vec (ops vc4_vec_ops [vc4])
	[   15.478722] vc4-drm soc:gpu: bound 3f004000.txp (ops vc4_txp_ops [vc4])
	[   15.485749] vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_hvs_ops [vc4])
	[   15.499009] vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops vc4_crtc_ops [vc4])
	[   15.526217] vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops vc4_crtc_ops [vc4])
	[   15.542257] vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops vc4_crtc_ops [vc4])
	[   15.560113] vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4])
	[   15.574684] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
	[   15.587375] [drm] Driver supports precise vblank timestamp query.
	[   15.606831] [drm] Initialized vc4 0.0.0 20140616 for soc:gpu on minor 0
	[   15.617505] Console: switching to colour frame buffer device 90x30
	[   15.627858] vc4-drm soc:gpu: fb0: vc4drmfb frame buffer device

Could it be that you forgot to update the device tree or kernel modules?

Regards,
Nicolas

[1] https://lkml.kernel.org/lkml/20200219102526.692126-1-jbrunet@baylibre.com/T/

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