drm/radeon: Workaround radeon driver bug for Loongson

Radeon driver can not handle the interrupt is faster than DMA data, so irq handler must update an old ih.rptr value in IH_RB_RPTR register to enable interrupt again when interrupt is faster than DMA data. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Zhijie Zhang <zhangzhijie@loongson.cn>
chenhuacai · Mar 23, 2024 · 741913c · 741913c
1 parent e841f70
commit 741913c
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diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
@@ -8093,6 +8093,7 @@ int cik_irq_process(struct radeon_device *rdev)
 	if (queue_thermal)
 		schedule_work(&rdev->pm.dpm.thermal.work);
 	rdev->ih.rptr = rptr;
+	WREG32(IH_RB_RPTR, rptr);
 	atomic_set(&rdev->ih.lock, 0);
 
 	/* make sure wptr hasn't changed while processing */

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
@@ -4919,6 +4919,7 @@ int evergreen_irq_process(struct radeon_device *rdev)
 	if (queue_thermal && rdev->pm.dpm_enabled)
 		schedule_work(&rdev->pm.dpm.thermal.work);
 	rdev->ih.rptr = rptr;
+	WREG32(IH_RB_RPTR, rptr);
 	atomic_set(&rdev->ih.lock, 0);
 
 	/* make sure wptr hasn't changed while processing */

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
@@ -4327,6 +4327,7 @@ int r600_irq_process(struct radeon_device *rdev)
 	if (queue_thermal && rdev->pm.dpm_enabled)
 		schedule_work(&rdev->pm.dpm.thermal.work);
 	rdev->ih.rptr = rptr;
+	WREG32(IH_RB_RPTR, rptr);
 	atomic_set(&rdev->ih.lock, 0);
 
 	/* make sure wptr hasn't changed while processing */

diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
@@ -6423,6 +6423,7 @@ int si_irq_process(struct radeon_device *rdev)
 	if (queue_thermal && rdev->pm.dpm_enabled)
 		schedule_work(&rdev->pm.dpm.thermal.work);
 	rdev->ih.rptr = rptr;
+	WREG32(IH_RB_RPTR, rptr);
 	atomic_set(&rdev->ih.lock, 0);
 
 	/* make sure wptr hasn't changed while processing */