[Intel-gfx] [PATCH 1/7] drm/i915: Don't set cursor pipe select bits on g4x+

[Ville Syrjala]

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

G4x cursor control registers still allow us to write to the pipe select
bits even though cursors are supposed to be fixed to a specific pipe.
Bspec tells us that we should only ever write 0 to these bits. Let's
follow that recommendation. On ilk+ the bits become hardwired to 0.

Also looks like ICL repurposes these bits for some other use, so
we had better stop setting them to bogus values there.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index af659d25943b..cccc1126f1d5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9532,7 +9532,8 @@ static u32 i9xx_cursor_ctl(const struct intel_crtc_state *crtc_state,
 	if (HAS_DDI(dev_priv))
 		cntl |= CURSOR_PIPE_CSC_ENABLE;
 
-	cntl |= MCURSOR_PIPE_SELECT(crtc->pipe);
+	if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
+		cntl |= MCURSOR_PIPE_SELECT(crtc->pipe);
 
 	switch (plane_state->base.crtc_w) {
 	case 64:
-- 
2.13.6