diff options
| author | Dmitry Osipenko <dmitry.osipenko@collabora.com> | 2023-08-07 03:04:44 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@collabora.com> | 2023-08-10 09:41:21 +0300 |
| commit | 2da20c92ce22e3e0356d0b3e3cdfc307bb24a1a0 (patch) | |
| tree | 837e3ae669db4b24c0d70f6f633967267de38fc0 | |
| parent | 991eb531f482a4ebf2265028add882f149ef1bdc (diff) | |
| download | linux-2da20c92ce22e3e0356d0b3e3cdfc307bb24a1a0.tar.xz | |
drm/panfrost: Sync IRQ by job's timeout handler
Panfrost IRQ handler may stuck for a long time, for example this happens
when there is a bad HDMI connection and HDMI handler takes a long time to
finish processing, holding Panfrost. Make Panfrost's job timeout handler
to sync IRQ before checking fence signal status in order to prevent
spurious job timeouts due to a slow IRQ processing.
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> # MediaTek MT8192 and MT8195 Chromebooks
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230807000444.14926-1-dmitry.osipenko@collabora.com
| -rw-r--r-- | drivers/gpu/drm/panfrost/panfrost_job.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c index dbc597ab46fb..a8b4827dc425 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -720,6 +720,22 @@ static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job if (dma_fence_is_signaled(job->done_fence)) return DRM_GPU_SCHED_STAT_NOMINAL; + /* + * Panfrost IRQ handler may take a long time to process an interrupt + * if there is another IRQ handler hogging the processing. + * For example, the HDMI encoder driver might be stuck in the IRQ + * handler for a significant time in a case of bad cable connection. + * In order to catch such cases and not report spurious Panfrost + * job timeouts, synchronize the IRQ handler and re-check the fence + * status. + */ + synchronize_irq(pfdev->js->irq); + + if (dma_fence_is_signaled(job->done_fence)) { + dev_warn(pfdev->dev, "unexpectedly high interrupt latency\n"); + return DRM_GPU_SCHED_STAT_NOMINAL; + } + dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p", js, job_read(pfdev, JS_CONFIG(js)), |