Re: [linux-sunxi] [PATCH v12 0/2] Initial Allwinner V3s CSI Support

From: Yong <yong.deng@magewell.com>
To: megous@megous.com
Cc: "Mark Rutland" <mark.rutland@arm.com>,
	"Neil Armstrong" <narmstrong@baylibre.com>,
	"Maxime Ripard" <maxime.ripard@bootlin.com>,
	"'Ondřej Jirman' via linux-sunxi" <linux-sunxi@googlegroups.com>,
	"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
	"Chen-Yu Tsai" <wens@csie.org>,
	"Hans Verkuil" <hans.verkuil@cisco.com>,
	"Geert Uytterhoeven" <geert@linux-m68k.org>,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	"Sakari Ailus" <sakari.ailus@linux.intel.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org,
	"Todor Tomov" <todor.tomov@linaro.org>,
	"Jacopo Mondi" <jacopo+renesas@jmondi.org>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [linux-sunxi] [PATCH v12 0/2] Initial Allwinner V3s CSI Support
Date: Wed, 26 Dec 2018 18:38:15 +0800	[thread overview]
Message-ID: <20181226183815.81443b67313823e4fd7788eb@magewell.com> (raw)
In-Reply-To: <20181226102936.2xxu7lii4kcg7656@core.my.home>

Hi,

On Wed, 26 Dec 2018 11:29:36 +0100
'Ondřej Jirman' via linux-sunxi <linux-sunxi@googlegroups.com> wrote:

> Hello,
> 
> On Tue, Oct 30, 2018 at 04:09:48PM +0800, Yong Deng wrote:
> > I can't make v4l2-compliance always happy.
> > The V3s CSI support many pixformats. But they are not always available.
> > It's dependent on the input bus format (MEDIA_BUS_FMT_*). 
> > Example:
> > V4L2_PIX_FMT_SBGGR8: MEDIA_BUS_FMT_SBGGR8_1X8
> > V4L2_PIX_FMT_YUYV: MEDIA_BUS_FMT_YUYV8_2X8
> > But I can't get the subdev's format code before starting stream as the
> > subdev may change it. So I can't know which pixformats are available.
> > So I exports all the pixformats supported by SoC.
> > The result is the app (v4l2-compliance) is likely to fail on streamon.
> > 
> > This patchset add initial support for Allwinner V3s CSI.
> 
> I've tested your patches on A83T and CSI works on that SoC too. I'll send
> DTS patches later.
> 
> One thing I noticed is that, when you cat the regmap registers file in debugfs
> while streaming, the kernel locks up hard. I was not able to extract any logs.

May be some registers can't be read when streaming ? Like read-clear regs ?
Or multi CPU core access regs at the same time may cause the bus lock up?

Thanks,
Yong

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