[Intel-gfx] [PATCH 3/3] drm/i915: Read out hrawclk on all gen3+ platforms

[Ville Syrjala <ville.syrjala@linux.intel.com>]

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

I've checked a bunch of gen3/4 machines and all seem to have
consistent FSB frequency information in the CLKCFG register.
So let's read out hrawclk on all gen3+ machines. Although
apart from g4x/pnv aux/pps dividers we only really need this
for for i965g/gm cs timestamp increment.

The CLKCFG memory clock values seem less consistent but we
don't care about those here.

For posterity here's a list of CLKCFG vs. FSB dumps from
a bunch of machines (only missing lpt for a full set):
machine CLKCFG     FSB
alv     0x00001411 533
gdg1    0x20000022 800
gdg2    0x20000022 800
cst     0x00010043 666
blb     0x00002034 1333
pnv1    0x00000423 666
pnv2    0x00000433 666
965gm   0x00004342 800
946gz   0x00000022 800
965g    0x00000422 800
g35     0x00000430 1066
        0x00000434 1333
ctg1    0x00644056 1066
ctg2    0x00644066 1066
elk1    0x00012420 1066
        0x00012424 1333
        0x00012436 1600
        0x00012422 800
elk2    0x00012040 1066

Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_cdclk.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index a71e65312ba0..a008aa25cc92 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -2678,7 +2678,7 @@ static int vlv_hrawclk(struct drm_i915_private *dev_priv)
 				      CCK_DISPLAY_REF_CLOCK_CONTROL);
 }
 
-static int g4x_hrawclk(struct drm_i915_private *dev_priv)
+static int i9xx_hrawclk(struct drm_i915_private *dev_priv)
 {
 	u32 clkcfg;
 
@@ -2735,8 +2735,8 @@ u32 intel_read_rawclk(struct drm_i915_private *dev_priv)
 		freq = pch_rawclk(dev_priv);
 	else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 		freq = vlv_hrawclk(dev_priv);
-	else if (IS_G4X(dev_priv) || IS_PINEVIEW(dev_priv))
-		freq = g4x_hrawclk(dev_priv);
+	else if (INTEL_GEN(dev_priv) >= 3)
+		freq = i9xx_hrawclk(dev_priv);
 	else
 		/* no rawclk on other platforms, or no need to know it */
 		return 0;
-- 
2.24.1

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