Hi Philipp, Steve and Russell, On Fri, Feb 17, 2017 at 12:43:38PM +0100, Philipp Zabel wrote: > On Thu, 2017-02-16 at 14:27 -0800, Steve Longerbeam wrote: > > > > On 02/16/2017 02:20 PM, Russell King - ARM Linux wrote: > > > On Wed, Feb 15, 2017 at 06:19:02PM -0800, Steve Longerbeam wrote: > > >> In version 4: > > > > > > With this version, I get: > > > > > > [28762.892053] imx6-mipi-csi2: LP-11 timeout, phy_state = 0x00000000 > > > [28762.899409] ipu1_csi0: pipeline_set_stream failed with -110 > > > > > > > Right, in the imx219, on exit from s_power(), the clock and data lanes > > must be placed in the LP-11 state. This has been done in the ov5640 and > > tc358743 subdevs. > > > > If we want to bring in the patch that adds a .prepare_stream() op, > > the csi-2 bus would need to be placed in LP-11 in that op instead. > > > > Philipp, should I go ahead and add your .prepare_stream() patch? > > I think with Russell's explanation of how the imx219 sensor operates, > we'll have to do something before calling the sensor s_stream, but right > now I'm still unsure what exactly. Indeed there appears to be no other way to achieve the LP-11 state than going through the streaming state for this particular sensor, apart from starting streaming. Is there a particular reason why you're waiting for the transmitter to transfer to LP-11 state? That appears to be the last step which is done in the csi2_s_stream() callback. What the sensor does next is to start streaming, and the first thing it does in that process is to switch to LP-11 state. Have you tried what happens if you simply drop the LP-11 check? To me that would seem the right thing to do. -- Kind regards, Sakari Ailus e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx
