[PATCH 2/2] drm/radeon: Fix max_vblank_count value for current display engines

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

The value was much too low, which could cause the userspace visible
vblank counter to move backwards when the hardware counter wrapped
around.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 drivers/gpu/drm/radeon/radeon_irq_kms.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 7162c93..d5c392b 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -143,7 +143,13 @@ void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
  */
 int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
 {
-	dev->max_vblank_count = 0x001fffff;
+	struct radeon_device *rdev = dev->dev_private;
+
+	if (ASIC_IS_AVIVO(rdev))
+		dev->max_vblank_count = 0x00ffffff;
+	else
+		dev->max_vblank_count = 0x001fffff;
+
 	return 0;
 }
 
-- 
2.1.4