[Intel-gfx] [PATCH] drm/i915: re-run init_clock_gating after gpu reset

[Daniel Vetter]

Over time we've added more and more workarounds in there for render
core issues, so these register settings will revert back to their
reset state. To avoid making a bad situation worse, re-run the clock
gating code after reset so that we don't crash right away with a known
hw issue.

Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/i915_drv.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 96f8efc..aafb942 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -850,6 +850,9 @@ int i915_reset(struct drm_device *dev, u8 flags)
 
 		i915_gem_init_ppgtt(dev);
 
+		/* Clock gating also touches registers in the GT core. */
+		intel_init_clock_gating(dev);
+
 		mutex_unlock(&dev->struct_mutex);
 		drm_irq_uninstall(dev);
 		drm_mode_config_reset(dev);
-- 
1.7.9.1