Hi Niklas, On Tuesday 09 Aug 2016 09:03:14 Niklas Söderlund wrote: > On 2016-08-09 06:01:48 +0000, Kuninori Morimoto wrote: > > Hi duclm > > > > > root@linaro-nano:~# cd /sys/bus/platform/drivers/i2c-rcar; find -type l > > > ./e6510000.i2c > > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# echo e6510000.i2c > > > > unbind [ 30.505950] clk_unregister: unregistering prepared clock: > > > clk_multiplier root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# ls > > > -d e6510000.i2c ls: cannot access e6510000.i2c: No such file or > > > directory > > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# echo e6510000.i2c > > > > bind [ 40.825298] cs2000-cp 2-004f: revision - C1 > > > [ 40.829587] i2c-rcar e6510000.i2c: probed > > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# ls -d e6510000.i2c > > > e6510000.i2c > > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# > > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# aplay > > > /home/board-lager/FSI/data/test.wav> > > Thank you for your report. > > This is open (and deep) issue (Oops after "unbind" -> "rebind") > > We have similar issue on I2C / ALSA SoC / DMAEngine / V4L2 SoC etc... > > and we should care about it, but it is still under discussion I think. > > ALSA SoC had started to solve this issue, but it will take over 2 years > > FWIW the VIN patches for Gen3 which are posted to ML solves the > unbind/bind problem for the rcar-vin driver. Given that the driver - allocates struct rvin_dev structure with devm_kzalloc - embeds struct video_device in rvin_dev - sets video_device::release to video_device_release_empty I have some doubts about this :-) Could you try the following sequence ? - Open the video device node and keep it open (yavta --sleep-forever) - Unbind the VIN device from the driver - Close the video device node -- Regards, Laurent Pinchart
