[PATCH 1/5] drm/i915: Increase maximum polling time to 50ms for forcewake request/clear ack

Sagar Arun Kamble
2015-08-23T12:21:38Z

On BXT, We Observe timeout for forcewake request completion with 2ms polling period as given here:
[drm:fw_domains_get] ERROR render: timed out waiting for forcewake ack request.
Polling for 50ms is recommended to avoid these timeouts.

Change-Id: Ie715b0069a3049606e9602bc5e97a6511890864d
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
drivers/gpu/drm/i915/intel_uncore.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 9d3c2e4..2df03b1 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -27,7 +27,7 @@

#include <linux/pm_runtime.h>

-#define FORCEWAKE_ACK_TIMEOUT_MS 2
+#define FORCEWAKE_ACK_TIMEOUT_MS 50

#define __raw_i915_read8(dev_priv__, reg__) readb((dev_priv__)->regs + (reg__))
#define __raw_i915_write8(dev_priv__, reg__, val__) writeb(val__, (dev_priv__)->regs + (reg__))
--
1.9.1