drm/i915/skl: SKL pipe misc programming

Pipe misc programming in gen9 is similar to BDW. Extending the BDW
implementation to gen 9.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Satheeshakrishna M <satheeshakrishna.m@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 40f73fc..901c035 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7064,7 +7064,7 @@
 	I915_WRITE(GAMMA_MODE(intel_crtc->pipe), GAMMA_MODE_MODE_8BIT);
 	POSTING_READ(GAMMA_MODE(intel_crtc->pipe));
 
-	if (IS_BROADWELL(dev)) {
+	if (IS_BROADWELL(dev) || INTEL_INFO(dev)->gen >= 9) {
 		val = 0;
 
 		switch (intel_crtc->config.pipe_bpp) {