From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Longerbeam Subject: Re: [PATCH v5 00/39] i.MX Media Driver Date: Sat, 18 Mar 2017 13:02:49 -0700 Message-ID: <7f10509d-bcfb-cf94-5f44-0591bb56d7fb@gmail.com> References: <1489121599-23206-1-git-send-email-steve_longerbeam@mentor.com> <20170312175118.GP21222@n2100.armlinux.org.uk> <191ef88d-2925-2264-6c77-46647394fc72@gmail.com> <20170312192932.GQ21222@n2100.armlinux.org.uk> <58b30bca-20ca-d4bd-7b86-04a4b8e71935@gmail.com> <20170312204037.GU21222@n2100.armlinux.org.uk> <20170312210952.GV21222@n2100.armlinux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" To: Russell King - ARM Linux Cc: mark.rutland@arm.com, andrew-ct.chen@mediatek.com, minghsiu.tsai@mediatek.com, sakari.ailus@linux.intel.com, nick@shmanahar.org, songjun.wu@microchip.com, hverkuil@xs4all.nl, pavel@ucw.cz, robert.jarzmik@free.fr, devel@driverdev.osuosl.org, markus.heiser@darmarIT.de, Steve Longerbeam , shuah@kernel.org, geert@linux-m68k.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, kernel@pengutronix.de, arnd@arndb.de, mchehab@kernel.org, bparrot@ti.com, robh+dt@kernel.org, horms+renesas@verge.net.au, tiffany.lin@mediatek.com, laurent.pinchart+renesas@ideasonboard.com, linux-arm-kernel@lists.infradead.org, niklas.soderlund+renesas@ragnatech.se, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, jean-christophe.trotin@st.com, p.zabel@pengutronix.de, fabio.estevam@nxp.com, shawnguo@kernel.org, sudipm.mukherjee@gmail.com List-Id: devicetree@vger.kernel.org Hi Russell, On 03/14/2017 10:29 AM, Steve Longerbeam wrote: > > > On 03/12/2017 02:09 PM, Russell King - ARM Linux wrote: >> On Sun, Mar 12, 2017 at 08:40:37PM +0000, Russell King - ARM Linux >> wrote: >>> On Sun, Mar 12, 2017 at 01:36:32PM -0700, Steve Longerbeam wrote: >>>> But hold on, if my logic is correct, then why did the CSI power-off >>>> get reached in your case, multiple times? Yes I think there is a bug, >>>> link_notify() is not checking if the link has already been disabled. >>>> I will fix this. But I'm surprised media core's link_notify handling >>>> doesn't do this. >>> Well, I think there's something incredibly fishy going on here. I >>> turned that dev_dbg() at the top of the function into a dev_info(), >>> and I get: >>> >>> root@hbi2ex:~# dmesg |grep -A2 imx-ipuv3-csi >>> [ 53.370949] imx-ipuv3-csi imx-ipuv3-csi.0: power OFF >>> [ 53.371015] ------------[ cut here ]------------ >>> [ 53.371075] WARNING: CPU: 0 PID: 1515 at >>> drivers/staging/media/imx/imx-media-csi.c:806 csi_s_power+0xb8/0xd0 >>> [imx_media_csi] >>> -- >>> [ 53.372624] imx-ipuv3-csi imx-ipuv3-csi.0: power OFF >>> [ 53.372637] ------------[ cut here ]------------ >>> [ 53.372663] WARNING: CPU: 0 PID: 1515 at >>> drivers/staging/media/imx/imx-media-csi.c:806 csi_s_power+0xb8/0xd0 >>> [imx_media_csi] >>> >>> There isn't a power on event being generated before these two power >>> off events. I don't see a power on event even when I attempt to >>> start streaming either (which fails due to the lack of bayer >>> support.) >> Found it - my imx219 driver returns '1' from its s_power function when >> powering up, which triggers a bug in your code - when >> imx_media_set_power() >> fails to power up, you call imx_media_set_power() telling it to power >> everything off - including devices that are already powered off. > > Yep, there's a bug in the error cleanup in > imx_media_pipeline_set_power(). > On error, it needs to backout by calling s_power(off) as it is doing, > but not > through the whole pipeline, but needs to stop at the subdev encountered > just before the subdev that failed. This was causing the s_power() > imbalance. > I will fix. > Due to some fixes to ov5640 from version 4, v4l2_pipeline_pm APIs are working now, so I've removed imx_media_pipeline_set_power() and switched to v4l2_pipeline_pm_use() in capture device open/release and v4l2_pipeline_link_notify() in imx_media_link_notify(), for the pipeline power management. Steve