This patch series comes with some minor fixes for Panfrost. Some of the
issues addressed were uncovered by LLM tools, while the one about RPM was
traditionally debugged.
The only proper bug fixes are the ones for perfcnt and RPM, and the others
are more about ensuring robustness. perfcnt bug was never observed in the
open, because no one had faced a HW reset when a perfcnt session was
ongoing. RPM fix addresses a well-known issue I had been observing for
quite some time, but that I had completely misunderstood.
Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
---
Changes in v5:
- Addressed more issues uncovered by Sashiko.
- Discarded two patches to avoid dealing with too many pre-existing issues at once.
- Biggest change is the re-arrangement of the start sequence, made to look like Panthor.
- Link to v4: https://patch.msgid.link/20260729-claude-fixes-v4-0-01968f2ec77a@collabora.com
Changes in v4:
- Fixed errors and issues uncovered by Sashiko in the previous revision.
- Changed the way RPM checks whether the device is initialised when resuming.
- Simplified perfcnt treatment of potential resets.
- Link to v3: https://patch.msgid.link/20260724-claude-fixes-v3-0-542af61abd0f@collabora.com
Changes in v3:
- Applied some minor suggestions for the first couple of patches in the series.
- Moved shrinker initialisation into gem initialisation.
- Fixed RPM bugs by moving all clock and power initialisation into RPM resume.
- Added patch for reset sequence fixes and also a userspace knob to trigger it.
- Reworked perfcnt fix by having the reset sequence restore its initial state.
- Link to v2: https://patch.msgid.link/20260604-claude-fixes-v2-0-57c6bd4c1655@collabora.com
Changes in v2:
- Fixed race conditions introduced by the previous revision, in the RPM and
HWPerf commits specifically. These can be consulted at [1]
- Don't attempt to suspend the device unconditionally at the end of
probe(), and do it through autosuspend instead.
- Broke the RPM patch into one that fixes PM refcnt proper and another one
for MMU enablement at device init time.
- Moved perfcnt GPU disable helper into its own commmit. Same for
transplating shrinker initialisation and unplug.
- Added 'Fixes' and 'Reported-by' tags to all the relevant commits
- [1] https://sashiko.dev/#/patchset/20260526-claude-fixes-v1-0-16e92eaa4949%40collabora.com
- Link to v1: https://patch.msgid.link/20260526-claude-fixes-v1-0-16e92eaa4949@collabora.com
To: Boris Brezillon <boris.brezillon@collabora.com>
To: Rob Herring <robh@kernel.org>
To: Steven Price <steven.price@arm.com>
To: Adrián Larumbe <adrian.larumbe@collabora.com>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: Maxime Ripard <mripard@kernel.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
To: David Airlie <airlied@gmail.com>
To: Simona Vetter <simona@ffwll.ch>
To: Faith Ekstrand <faith.ekstrand@collabora.com>
To: "Marty E. Plummer" <hanetzer@startmail.com>
To: Tomeu Vizoso <tomeu@tomeuvizoso.net>
To: Eric Anholt <eric@anholt.net>
To: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
To: Robin Murphy <robin.murphy@arm.com>
To: Philipp Zabel <p.zabel@pengutronix.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: Neil Armstrong <neil.armstrong@linaro.org>
---
Adrián Larumbe (11):
drm/panfrost: Check another bo field for cache option query
drm/panfrost: Prevent division by 0
drm/panfrost: Remove unnecessary header file include
drm/panfrost: Move shrinker initialization and unplug one level down
drm/panfrost: Move all device power up and down into RPM callbacks
drm/panfrost: Explicitly enable MMU interrupts at device init
drm/panfrost: Add debugfs knob for manually triggering a GPU reset
drm/panfrost: Move perfcnt GPU disable sequence into a helper
drm/panfrost: Introduce a reset lock
drm/panfrost: Fix races between perfcnt and reset sequence
drm/panfrost: Bump driver minor to reflect new DUMP IOCTL req field
drivers/gpu/drm/panfrost/panfrost_devfreq.c | 2 +-
drivers/gpu/drm/panfrost/panfrost_device.c | 412 ++++++++++++++---------
drivers/gpu/drm/panfrost/panfrost_device.h | 12 +
drivers/gpu/drm/panfrost/panfrost_drv.c | 32 +-
drivers/gpu/drm/panfrost/panfrost_gem.c | 25 +-
drivers/gpu/drm/panfrost/panfrost_gem.h | 7 +-
drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c | 8 +-
drivers/gpu/drm/panfrost/panfrost_gpu.c | 9 +-
drivers/gpu/drm/panfrost/panfrost_gpu.h | 1 -
drivers/gpu/drm/panfrost/panfrost_job.c | 8 +-
drivers/gpu/drm/panfrost/panfrost_mmu.c | 20 +-
drivers/gpu/drm/panfrost/panfrost_mmu.h | 1 -
drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 249 +++++++++-----
drivers/gpu/drm/panfrost/panfrost_perfcnt.h | 2 +
include/uapi/drm/panfrost_drm.h | 3 +-
15 files changed, 495 insertions(+), 296 deletions(-)
---
base-commit: 671b7825dbfe9ea6e3ad3001003aeee0df48d1b5
change-id: 20260523-claude-fixes-82b03a134a8c
Best regards,
--
Adrián Larumbe <adrian.larumbe@collabora.com>