[Intel-gfx] [PATCH 3/4] drm/i915: Make the CHV CGM CSC register writes lockless

[Ville Syrjala]

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

The CHV CGM CSC registers are single buffered and so we
may have to write them from the vblank worker, which
imposes very tight dealines. Drop the pointless locking
for the register accessess to reduce the overhead.
All the other registers we bash from the vblank worker
(LUTs) were already made lockless earlier.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index a41da9e3f9dc..8e05fb40d2bf 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -377,16 +377,16 @@ static void chv_load_cgm_csc(struct intel_crtc *crtc,
 		coeffs[i] |= (abs_coeff >> 20) & 0xfff;
 	}
 
-	intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF01(pipe),
-		       coeffs[1] << 16 | coeffs[0]);
-	intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF23(pipe),
-		       coeffs[3] << 16 | coeffs[2]);
-	intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF45(pipe),
-		       coeffs[5] << 16 | coeffs[4]);
-	intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF67(pipe),
-		       coeffs[7] << 16 | coeffs[6]);
-	intel_de_write(dev_priv, CGM_PIPE_CSC_COEFF8(pipe),
-		       coeffs[8]);
+	intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF01(pipe),
+			  coeffs[1] << 16 | coeffs[0]);
+	intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF23(pipe),
+			  coeffs[3] << 16 | coeffs[2]);
+	intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF45(pipe),
+			  coeffs[5] << 16 | coeffs[4]);
+	intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF67(pipe),
+			  coeffs[7] << 16 | coeffs[6]);
+	intel_de_write_fw(dev_priv, CGM_PIPE_CSC_COEFF8(pipe),
+			  coeffs[8]);
 }
 
 /* convert hw value with given bit_precision to lut property val */
-- 
2.34.1