[PATCH v3 2/3] drm/panthor: Fix ordering in _irq_suspend()

[Boris Brezillon]

Make sure we set suspended=true last to avoid generating an irq storm
in the unlikely case where an IRQ happens between the suspended=true
assignment and the _INT_MASK update.

We also move the mask=0 assignment before writing to the _INT_MASK
register to prevent the thread handler from unmasking the interrupt
behind our back. This means we might lose events if there were some
pending when we get to suspend the IRQ, but that's fine.
The synchronize_irq() we have in the _irq_suspend() path was not
there to make sure all IRQs are processed, just to make sure we don't
have registers accesses coming from the irq handlers after
_irq_suspend() has been called. If there's a need to have all pending
IRQs processed, it should happen before _irq_suspend() is called.

v3:
- Add Steve's R-b

v2:
- New patch

Fixes: 5fe909cae118 ("drm/panthor: Add the device logical block")
Reported-by: Steven Price <steven.price at arm.com>
Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
Reviewed-by: Steven Price <steven.price at arm.com>
---
 drivers/gpu/drm/panthor/panthor_device.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
index 7ee4987a3796..3a930a368ae1 100644
--- a/drivers/gpu/drm/panthor/panthor_device.h
+++ b/drivers/gpu/drm/panthor/panthor_device.h
@@ -325,7 +325,7 @@ static inline void panthor_ ## __name ## _irq_suspend(struct panthor_irq *pirq)
 {												\
 	int cookie;										\
 												\
-	atomic_set(&pirq->suspended, true);							\
+	pirq->mask = 0;										\
 												\
 	if (drm_dev_enter(&pirq->ptdev->base, &cookie)) {					\
 		gpu_write(pirq->ptdev, __reg_prefix ## _INT_MASK, 0);				\
@@ -333,7 +333,7 @@ static inline void panthor_ ## __name ## _irq_suspend(struct panthor_irq *pirq)
 		drm_dev_exit(cookie);								\
 	}											\
 												\
-	pirq->mask = 0;										\
+	atomic_set(&pirq->suspended, true);							\
 }												\
 												\
 static inline void panthor_ ## __name ## _irq_resume(struct panthor_irq *pirq, u32 mask)	\
-- 
2.44.0