Hi Peter, On Wednesday 12 February 2014 16:19:55 Peter Meerwald wrote: > Hello, > > some more findings: > > * the driver bug seen below was observed with kernel 3.7 and is already > fixed in more recent kernels, likely with commit 864a121274, > [media] v4l: Don't warn during link validation when encountering a V4L2 > devnode Correct. I tend to forget about bugs that have been fixed ;-) > * there still is a a confusing warning: > omap3isp omap3isp: can't find source, failing now > which may be addressed by the patch here https://linuxtv.org/patch/15200/, > but has not been applied The patch won't apply anymore. I've just submitted two other patches (you've been CCed) to fix the problem, could you please test them ? > * I have a test program, http://pmeerw.net/scaler.c, which exercises the > OMAP3 ISP resizer standalone with the pipeline given below; it crashes the > system quite reliably on 3.7 and recent kernels :( > > the reason for the crash is that the ISP resizer can still be busy and > doesn't like to be turned off then; a little sleep before > omap3isp_sbl_disable() helps (or waiting for the ISP resize to become > idle, see the patch below) > > I'm not sure what omap3isp_module_sync_idle() is supposed to do, it > immediately returns since we are in SINGLESHOT mode and > isp_pipeline_ready() is false The function is supposed to wait until the module becomes idle. I'm not sure why we don't call it for memory-to-memory pipelines, I need to investigate that. Sakari, do you remember what we've done there ? > with below patch I am happily resizing... > > // snip, RFC > From: Peter Meerwald <p.meerwald@xxxxxxxxxxxxxxxxxx> > Date: Wed, 12 Feb 2014 15:59:20 +0100 > Subject: [PATCH] omap3isp: Wait for resizer to become idle before > disabling > > --- > drivers/media/platform/omap3isp/ispresizer.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/media/platform/omap3isp/ispresizer.c > b/drivers/media/platform/omap3isp/ispresizer.c > index d11fb26..fea98f7 100644 > --- a/drivers/media/platform/omap3isp/ispresizer.c > +++ b/drivers/media/platform/omap3isp/ispresizer.c > @@ -1145,6 +1145,7 @@ static int resizer_set_stream(struct v4l2_subdev *sd, > int enable) struct isp_video *video_out = &res->video_out; > struct isp_device *isp = to_isp_device(res); > struct device *dev = to_device(res); > + unsigned long timeout = 0; > > if (res->state == ISP_PIPELINE_STREAM_STOPPED) { > if (enable == ISP_PIPELINE_STREAM_STOPPED) > @@ -1176,6 +1177,15 @@ static int resizer_set_stream(struct v4l2_subdev *sd, > int enable) if (omap3isp_module_sync_idle(&sd->entity, &res->wait, > &res->stopping)) > dev_dbg(dev, "%s: module stop timeout.\n", > sd->name); > + > + while (omap3isp_resizer_busy(res)) { > + if (timeout++ > 1000) { > + dev_alert(isp->dev, "ISP resizer does not > become idle\n"); > + return -ETIMEDOUT; > + } > + udelay(100); > + } > + Let's try to avoid busy loops if possible. Does it help if you comment out the condition at the top of omap3isp_module_sync_idle() ? > omap3isp_sbl_disable(isp, OMAP3_ISP_SBL_RESIZER_READ | > OMAP3_ISP_SBL_RESIZER_WRITE); > omap3isp_subclk_disable(isp, OMAP3_ISP_SUBCLK_RESIZER); -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
