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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 Reported-by: Johan Hovold Tested-by: Johan Hovold --- drivers/media/platform/qcom/camss/camss-video.c | 6 ------ 1 file changed, 6 deletions(-) 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; From patchwork Sun Jul 14 22:53:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bryan O'Donoghue X-Patchwork-Id: 13732812 Received: from mail-wm1-f47.google.com (mail-wm1-f47.google.com [209.85.128.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7516F13D28F for ; Sun, 14 Jul 2024 22:53:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720997638; cv=none; b=TxJ4WF6iyUGFJ4BBNrcOAG/dB9LTAWfku2uA48WVFuMBPEOI/1GKGVzUfPw/IRPQmVLAFdSs6CNsBb5Zjtw5VJflW2nYoCVehDBg+i9+PKR23D9bXIeJ7Q2vVgJcyVdKvFjUQ5mIPKWz1IyJNBGWES/FBy8U+KshptubCRMBD0M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; 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Sun, 14 Jul 2024 15:53:53 -0700 (PDT) From: Bryan O'Donoghue Date: Sun, 14 Jul 2024 23:53:59 +0100 Subject: [PATCH 2/2] media: qcom: camss: Fix ordering of pm_runtime_enable Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240714-linux-next-24-07-13-camss-fixes-v1-2-8f8954bc8c85@linaro.org> References: <20240714-linux-next-24-07-13-camss-fixes-v1-0-8f8954bc8c85@linaro.org> In-Reply-To: <20240714-linux-next-24-07-13-camss-fixes-v1-0-8f8954bc8c85@linaro.org> To: Robert Foss , Todor Tomov , Mauro Carvalho Chehab , Hans Verkuil , Hans Verkuil , Milen Mitkov Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , Johan Hovold , Bryan O'Donoghue X-Mailer: b4 0.15-dev-13183 pm_runtime_enable() should happen prior to vfe_get() since vfe_get() calls pm_runtime_resume_and_get(). This is a basic race condition that doesn't show up for most users so is not widely reported. If you blacklist qcom-camss in modules.d and then subsequently modprobe the module post-boot it is possible to reliably show this error up. Fixes: 02afa816dbbf ("media: camss: Add basic runtime PM support") Signed-off-by: Bryan O'Donoghue Reported-by: Johan Hovold Tested-by: Johan Hovold --- drivers/media/platform/qcom/camss/camss.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c index 51b1d3550421..d64985ca6e88 100644 --- a/drivers/media/platform/qcom/camss/camss.c +++ b/drivers/media/platform/qcom/camss/camss.c @@ -2283,6 +2283,8 @@ static int camss_probe(struct platform_device *pdev) v4l2_async_nf_init(&camss->notifier, &camss->v4l2_dev); + pm_runtime_enable(dev); + num_subdevs = camss_of_parse_ports(camss); if (num_subdevs < 0) { ret = num_subdevs; @@ -2323,8 +2325,6 @@ static int camss_probe(struct platform_device *pdev) } } - pm_runtime_enable(dev); - return 0; err_register_subdevs: @@ -2332,6 +2332,7 @@ static int camss_probe(struct platform_device *pdev) err_v4l2_device_unregister: v4l2_device_unregister(&camss->v4l2_dev); v4l2_async_nf_cleanup(&camss->notifier); + pm_runtime_disable(dev); err_genpd_cleanup: camss_genpd_cleanup(camss);