drm/i915: vlv: increase timeout when forcing on the GFX clock

I've seen latencies up to 15msec, so increase the timeout to 20msec.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 9f3e977d1877..208e185c16a9 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -944,7 +944,7 @@ int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool force_on)
 #define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) & VLV_GFX_CLK_STATUS_BIT)
         /* Wait for a previous force-off to settle */
         if (force_on) {
-                err = wait_for(!COND, 5);
+                err = wait_for(!COND, 20);
                 if (err) {
                         DRM_ERROR("timeout waiting for GFX clock force-off (%08x)\n",
                                   I915_READ(VLV_GTLC_SURVIVABILITY_REG));
@@ -961,7 +961,7 @@ int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool force_on)
         if (!force_on)
                 return 0;
 
-        err = wait_for(COND, 5);
+        err = wait_for(COND, 20);
         if (err)
                 DRM_ERROR("timeout waiting for GFX clock force-on (%08x)\n",
                           I915_READ(VLV_GTLC_SURVIVABILITY_REG));