Pispbe/rpi 6.6.y/split jobs handling v2 #6324
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added 4 commits
August 26, 2024 12:24
A comment in the pisp_be driver references to the pispbe_schedule_internal() which doesn't exist. Drop it. Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
The config parameters buffer is already validated in pisp_be_validate_config() at .buf_prepare() time. However some of the same validations are also performed at pispbe_schedule() time. In particular the function checks that: 1) config.num_tiles is valid 2) At least one of the BAYER or RGB input is enabled The input validation is already performed in pisp_be_validate_config() and there is no need to repeat that at pispbe_schedule() time. The num_tiles validation can be moved to pisp_be_validate_config() as well. As num_tiles is a u32 it can'be be < 0, so change the sanity check accordingly. Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Currently the 'pispbe_schedule()' function does two things: 1) Tries to assemble a job by inspecting all the video node queues to make sure all the required buffers are available 2) Submit the job to the hardware The pispbe_schedule() function is called at: - video device start_streaming() time - video device qbuf() time - irq handler As assembling a job requires inspecting all queues, it is a rather time consuming operation which is better not run in IRQ context. To avoid the executing the time consuming job creation in interrupt context split the job creation and job scheduling in two distinct operations. When a well-formed job is created, append it to the newly introduced 'pispbe->job_queue' where it will be dequeued from by the scheduling routine. At start_streaming() and qbuf() time immediately try to schedule a job if one has been created as the irq handler routing is only called when a job has completed, and we can't solely rely on it for scheduling new jobs. Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
The pisp_be driver uses and depends on runtime_pm. During the probe() routine, the driver needs to power up the interface in order to identify and initialize the hardware and it later suspends it at the end of probe(). The driver erroneously resumes the interface by calling the pispbe_runtime_resume() function directly, without going through the pm_runtime helpers, but later suspends it by calling pm_runtime_put_autosuspend(). This causes a PM usage count imbalance at probe time, notified by the runtime_pm framework with the below message in the system log: pispbe 1000880000.pisp_be: Runtime PM usage count underflow! Fix this by resuming the interface using the pm runtime helpers instead of calling the resume function directly. Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
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All changes look reasonable to me. @jmondi did you test with dual camera running? |
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PS: Sorry for the delay, but I will respond on the linux-media list shortly as well. |
Yup! Same results as v1, I was puzzled that I got the ov5647 running at 10fps and thought it was something related to this patch, but I get the same results with plain rpi-6.6.y |
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LGTM. Merging now. |
Or should we wait for comments upstream so that we're merging the same version ? |
Ok sounds sensible. |
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closing as I've update the original one in #6302 |
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