[Intel-gfx] [PATCH 3/3] drm/i915: add ICP support to cnp_rawclk() and kill icp_rawclk()

[Paulo Zanoni]

I think I'm probably the one who argued in favor of having separate
implementations for both PCHs, but the calculations are actually the
same, the clocks are the same and the only difference is that on ICP
we write the numerator to the register.

I have previously suggested to kill cnp_rawclk() and keep the
icp_rawclk() style, but Ville gave some good arguments that what's in
this patch may be the better choice.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/intel_cdclk.c | 37 ++++++++-----------------------------
 1 file changed, 8 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 928671936286..60437675354e 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -2661,36 +2661,17 @@ static int cnp_rawclk(struct drm_i915_private *dev_priv)
 	}
 
 	rawclk = CNP_RAWCLK_DIV(divider / 1000);
-	if (fraction)
-		rawclk |= CNP_RAWCLK_DEN(DIV_ROUND_CLOSEST(1000,
-							   fraction) - 1);
+	if (fraction) {
+		int numerator = 1000;
 
-	I915_WRITE(PCH_RAWCLK_FREQ, rawclk);
-	return divider + fraction;
-}
-
-static int icp_rawclk(struct drm_i915_private *dev_priv)
-{
-	u32 rawclk;
-	int divider, numerator, denominator, frequency;
-
-	if (I915_READ(SFUSE_STRAP) & SFUSE_STRAP_RAW_FREQUENCY) {
-		frequency = 24000;
-		divider = 24;
-		numerator = 0;
-		denominator = 0;
-	} else {
-		frequency = 19200;
-		divider = 19;
-		numerator = 1;
-		denominator = 4;
+		rawclk |= CNP_RAWCLK_DEN(DIV_ROUND_CLOSEST(numerator,
+							   fraction) - 1);
+		if (HAS_PCH_ICP(dev_priv))
+			rawclk |= ICP_RAWCLK_NUM(numerator / 1000);
 	}
 
-	rawclk = CNP_RAWCLK_DIV(divider) | ICP_RAWCLK_NUM(numerator) |
-		 CNP_RAWCLK_DEN(denominator);
-
 	I915_WRITE(PCH_RAWCLK_FREQ, rawclk);
-	return frequency;
+	return divider + fraction;
 }
 
 static int pch_rawclk(struct drm_i915_private *dev_priv)
@@ -2740,9 +2721,7 @@ static int g4x_hrawclk(struct drm_i915_private *dev_priv)
  */
 void intel_update_rawclk(struct drm_i915_private *dev_priv)
 {
-	if (HAS_PCH_ICP(dev_priv))
-		dev_priv->rawclk_freq = icp_rawclk(dev_priv);
-	else if (HAS_PCH_CNP(dev_priv))
+	if (HAS_PCH_CNP(dev_priv) || HAS_PCH_ICP(dev_priv))
 		dev_priv->rawclk_freq = cnp_rawclk(dev_priv);
 	else if (HAS_PCH_SPLIT(dev_priv))
 		dev_priv->rawclk_freq = pch_rawclk(dev_priv);
-- 
2.14.4