[Intel-gfx] [PATCH] drm/i915/bdw: Don't use forcewake needlessly

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Not all registers need forcewake even if they're not shadowed.
Add the missing NEEDS_FORCE_WAKE() check to gen8_writeX() to
avoid needless forcewake usage when writing eg. display
registers.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
I didn't test this at all, so be warned.

 drivers/gpu/drm/i915/intel_uncore.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index e63658e..78fe8d6 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -616,7 +616,8 @@ static bool is_gen8_shadowed(struct drm_i915_private *dev_priv, u32 reg)
 #define __gen8_write(x) \
 static void \
 gen8_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
-	bool __needs_put = !is_gen8_shadowed(dev_priv, reg); \
+	bool __needs_put = NEEDS_FORCE_WAKE(dev_priv, reg) && \
+		!is_gen8_shadowed(dev_priv, reg); \
 	REG_WRITE_HEADER; \
 	if (__needs_put) { \
 		dev_priv->uncore.funcs.force_wake_get(dev_priv, \
-- 
1.8.3.2