devfreq_{resume,suspend}_device() don't bother undoing the suspend_count
modifications if something fails, so either it assumes failures are
harmless, or it's super fragile/buggy. In either case it's not something
we can address at the driver level, so let's just assume failures are
harmless for now, like is done in panfrost.
v2:
- Add R-b
Signed-off-by: Boris Brezillon <boris.brezil...@collabora.com>
Reviewed-by: Steven Price <steven.pr...@arm.com>
---
drivers/gpu/drm/panthor/panthor_devfreq.c | 12 ++++----
drivers/gpu/drm/panthor/panthor_devfreq.h | 4 +--
drivers/gpu/drm/panthor/panthor_device.c | 35 ++---------------------
3 files changed, 11 insertions(+), 40 deletions(-)
diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.c
b/drivers/gpu/drm/panthor/panthor_devfreq.c
index ecc7a52bd688..3686515d368d 100644
--- a/drivers/gpu/drm/panthor/panthor_devfreq.c
+++ b/drivers/gpu/drm/panthor/panthor_devfreq.c
@@ -243,26 +243,26 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
return 0;
}
-int panthor_devfreq_resume(struct panthor_device *ptdev)
+void panthor_devfreq_resume(struct panthor_device *ptdev)
{
struct panthor_devfreq *pdevfreq = ptdev->devfreq;
if (!pdevfreq->devfreq)
- return 0;
+ return;
panthor_devfreq_reset(pdevfreq);
- return devfreq_resume_device(pdevfreq->devfreq);
+ drm_WARN_ON(&ptdev->base, devfreq_resume_device(pdevfreq->devfreq));
}
-int panthor_devfreq_suspend(struct panthor_device *ptdev)
+void panthor_devfreq_suspend(struct panthor_device *ptdev)
{
struct panthor_devfreq *pdevfreq = ptdev->devfreq;
if (!pdevfreq->devfreq)
- return 0;
+ return;
- return devfreq_suspend_device(pdevfreq->devfreq);
+ drm_WARN_ON(&ptdev->base, devfreq_suspend_device(pdevfreq->devfreq));
}
void panthor_devfreq_record_busy(struct panthor_device *ptdev)
diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.h
b/drivers/gpu/drm/panthor/panthor_devfreq.h
index 83a5c9522493..b7631de695f7 100644
--- a/drivers/gpu/drm/panthor/panthor_devfreq.h
+++ b/drivers/gpu/drm/panthor/panthor_devfreq.h
@@ -12,8 +12,8 @@ struct panthor_devfreq;
int panthor_devfreq_init(struct panthor_device *ptdev);
-int panthor_devfreq_resume(struct panthor_device *ptdev);
-int panthor_devfreq_suspend(struct panthor_device *ptdev);
+void panthor_devfreq_resume(struct panthor_device *ptdev);
+void panthor_devfreq_suspend(struct panthor_device *ptdev);
void panthor_devfreq_record_busy(struct panthor_device *ptdev);
void panthor_devfreq_record_idle(struct panthor_device *ptdev);
diff --git a/drivers/gpu/drm/panthor/panthor_device.c
b/drivers/gpu/drm/panthor/panthor_device.c
index e701e605d013..e3b22107b268 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -453,9 +453,7 @@ int panthor_device_resume(struct device *dev)
if (ret)
goto err_disable_stacks_clk;
- ret = panthor_devfreq_resume(ptdev);
- if (ret)
- goto err_disable_coregroup_clk;
+ panthor_devfreq_resume(ptdev);
if (panthor_device_is_initialized(ptdev) &&
drm_dev_enter(&ptdev->base, &cookie)) {
@@ -492,8 +490,6 @@ int panthor_device_resume(struct device *dev)
err_suspend_devfreq:
panthor_devfreq_suspend(ptdev);
-
-err_disable_coregroup_clk:
clk_disable_unprepare(ptdev->clks.coregroup);
err_disable_stacks_clk:
@@ -510,7 +506,7 @@ int panthor_device_resume(struct device *dev)
int panthor_device_suspend(struct device *dev)
{
struct panthor_device *ptdev = dev_get_drvdata(dev);
- int ret, cookie;
+ int cookie;
if (atomic_read(&ptdev->pm.state) != PANTHOR_DEVICE_PM_STATE_ACTIVE)
return -EINVAL;
@@ -542,36 +538,11 @@ int panthor_device_suspend(struct device *dev)
drm_dev_exit(cookie);
}
- ret = panthor_devfreq_suspend(ptdev);
- if (ret) {
- if (panthor_device_is_initialized(ptdev) &&
- drm_dev_enter(&ptdev->base, &cookie)) {
- panthor_gpu_resume(ptdev);
- panthor_mmu_resume(ptdev);
- drm_WARN_ON(&ptdev->base, panthor_fw_resume(ptdev));
- panthor_sched_resume(ptdev);
- drm_dev_exit(cookie);
- }
-
- goto err_set_active;
- }
+ panthor_devfreq_suspend(ptdev);
clk_disable_unprepare(ptdev->clks.coregroup);
clk_disable_unprepare(ptdev->clks.stacks);
clk_disable_unprepare(ptdev->clks.core);
atomic_set(&ptdev->pm.state, PANTHOR_DEVICE_PM_STATE_SUSPENDED);
return 0;
-
-err_set_active:
- /* If something failed and we have to revert back to an
- * active state, we also need to clear the MMIO userspace
- * mappings, so any dumb pages that were mapped while we
- * were trying to suspend gets invalidated.
- */
- mutex_lock(&ptdev->pm.mmio_lock);
- atomic_set(&ptdev->pm.state, PANTHOR_DEVICE_PM_STATE_ACTIVE);
- unmap_mapping_range(ptdev->base.anon_inode->i_mapping,
- DRM_PANTHOR_USER_MMIO_OFFSET, 0, 1);
- mutex_unlock(&ptdev->pm.mmio_lock);
- return ret;
}
--
2.46.2
