| Message ID | 20240714-linux-next-24-07-13-camss-fixes-v1-1-8f8954bc8c85@linaro.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | media: qcom: camss: Fix two CAMSS bugs found by dogfooding with SoftISP | expand |
On Sun, Jul 14, 2024 at 11:53:58PM +0100, Bryan O'Donoghue wrote: > The use_count check was introduced so that multiple concurrent Raw Data > Interfaces RDIs could be driven by different virtual channels VCs on the > CSIPHY input driving the video pipeline. > > This is an invalid use of use_count though as use_count pertains to the > number of times a video entity has been opened by user-space not the number > of active streams. > > If use_count and stream-on count don't agree then stop_streaming() will > break as is currently the case and has become apparent when using CAMSS > with libcamera's released softisp 0.3. > > The use of use_count like this is a bit hacky and right now breaks regular > usage of CAMSS for a single stream case. Please be a bit more specific about how this manifest itself to the user. I see error message when stopping a stream (e.g. stopping qcam) and the stream cannot be restarted (e.g. qcam fails with -EBUSY). > One CAMSS specific way to handle multiple VCs on the same RDI might be: > > - Reference count each pipeline enable for CSIPHY, CSID, VFE and RDIx. > - The video buffers are already associated with msm_vfeN_rdiX so > release video buffers when told to do so by stop_streaming. > - Only release the power-domains for the CSIPHY, CSID and VFE when > their internal refcounts drop. > > Either way refusing to release video buffers based on use_count is > erroneous and should be reverted. The silicon enabling code for selecting > VCs is perfectly fine. Its a "known missing feature" that concurrent VCs > won't work with CAMSS right now. > > Initial testing with this code didn't show an error but, SoftISP and "real" > usage with Google Hangouts breaks the upstream code pretty quickly, we need > to do a partial revert and take another pass at VCs. Please include the error messages that users see so that people can find this patch, for example: [ 1265.509831] WARNING: CPU: 5 PID: 919 at drivers/media/common/videobuf2/videobuf2-core.c:2183 __vb2_queue_cancel+0x230/0x2c8 [videobuf2_common] ... [ 1265.510630] Call trace: [ 1265.510636] __vb2_queue_cancel+0x230/0x2c8 [videobuf2_common] [ 1265.510648] vb2_core_streamoff+0x24/0xcc [videobuf2_common] [ 1265.510660] vb2_ioctl_streamoff+0x5c/0xa8 [videobuf2_v4l2] [ 1265.510673] v4l_streamoff+0x24/0x30 [videodev] [ 1265.510707] __video_do_ioctl+0x190/0x3f4 [videodev] [ 1265.510732] video_usercopy+0x304/0x8c4 [videodev] [ 1265.510757] video_ioctl2+0x18/0x34 [videodev] [ 1265.510782] v4l2_ioctl+0x40/0x60 [videodev] ... [ 1265.510944] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 0 in active state [ 1265.511175] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 1 in active state [ 1265.511398] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 2 in active state > This commit partially reverts commit 89013969e232 ("media: camss: sm8250: > Pipeline starting and stopping for multiple virtual channels") > > Fixes: 89013969e232 ("media: camss: sm8250: Pipeline starting and stopping for multiple virtual channels") Looks like you're missing a CC stable tag here? > Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Reported-by: Johan Hovold <johan+linaro@kernel.org> Link: https://lore.kernel.org/lkml/ZoVNHOTI0PKMNt4_@hovoldconsulting.com/ Tested-by: Johan Hovold <johan+linaro@kernel.org> Johan
diff --git a/drivers/media/platform/qcom/camss/camss-video.c b/drivers/media/platform/qcom/camss/camss-video.c index cd72feca618c..3b8fc31d957c 100644 --- a/drivers/media/platform/qcom/camss/camss-video.c +++ b/drivers/media/platform/qcom/camss/camss-video.c @@ -297,12 +297,6 @@ static void video_stop_streaming(struct vb2_queue *q) ret = v4l2_subdev_call(subdev, video, s_stream, 0); - if (entity->use_count > 1) { - /* Don't stop if other instances of the pipeline are still running */ - dev_dbg(video->camss->dev, "Video pipeline still used, don't stop streaming.\n"); - return; - } - if (ret) { dev_err(video->camss->dev, "Video pipeline stop failed: %d\n", ret); return;
The use_count check was introduced so that multiple concurrent Raw Data Interfaces RDIs could be driven by different virtual channels VCs on the CSIPHY input driving the video pipeline. This is an invalid use of use_count though as use_count pertains to the number of times a video entity has been opened by user-space not the number of active streams. If use_count and stream-on count don't agree then stop_streaming() will break as is currently the case and has become apparent when using CAMSS with libcamera's released softisp 0.3. The use of use_count like this is a bit hacky and right now breaks regular usage of CAMSS for a single stream case. One CAMSS specific way to handle multiple VCs on the same RDI might be: - Reference count each pipeline enable for CSIPHY, CSID, VFE and RDIx. - The video buffers are already associated with msm_vfeN_rdiX so release video buffers when told to do so by stop_streaming. - Only release the power-domains for the CSIPHY, CSID and VFE when their internal refcounts drop. Either way refusing to release video buffers based on use_count is erroneous and should be reverted. The silicon enabling code for selecting VCs is perfectly fine. Its a "known missing feature" that concurrent VCs won't work with CAMSS right now. Initial testing with this code didn't show an error but, SoftISP and "real" usage with Google Hangouts breaks the upstream code pretty quickly, we need to do a partial revert and take another pass at VCs. This commit partially reverts commit 89013969e232 ("media: camss: sm8250: Pipeline starting and stopping for multiple virtual channels") Fixes: 89013969e232 ("media: camss: sm8250: Pipeline starting and stopping for multiple virtual channels") Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> --- drivers/media/platform/qcom/camss/camss-video.c | 6 ------ 1 file changed, 6 deletions(-)