[Intel-gfx] [RFC 07/60] drm/i915/dg1: Initialize RAWCLK properly

[Matthew Auld]

From: Matt Roper <matthew.d.roper at intel.com>

DG1 always uses a 38.4 MHz rawclk rather than the 19.2/24 MHz
frequencies on CNP+.  Note that register bits associated with this
frequency confusingly use 37 for the divider field rather than 38 as you
might expect.

For simplicity, let's just assume that this 38.4 MHz frequency will hold
true for other future platforms with "fake" PCH south displays and that
the CNP-style behavior will remain for other platforms with a real PCH.

Bspec: 49950
Bspec: 49309
Cc: Aditya Swarup <aditya.swarup at intel.com>
Cc: Clinton Taylor <Clinton.A.Taylor at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/display/intel_cdclk.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index bb91dace304a..a779da701ad5 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -2680,6 +2680,18 @@ void intel_update_cdclk(struct drm_i915_private *dev_priv)
 		               DIV_ROUND_UP(dev_priv->cdclk.hw.cdclk, 1000));
 }
 
+static int dg1_rawclk(struct drm_i915_private *dev_priv)
+{
+	/*
+	 * DG1 always uses a 38.4 MHz rawclk.  The bspec tells us
+	 * "Program Numerator=2, Denominator=4, Divider=37 decimal."
+	 */
+	I915_WRITE(PCH_RAWCLK_FREQ,
+		   CNP_RAWCLK_DEN(4) | CNP_RAWCLK_DIV(37) | ICP_RAWCLK_NUM(2));
+
+	return 38400;
+}
+
 static int cnp_rawclk(struct drm_i915_private *dev_priv)
 {
 	u32 rawclk;
@@ -2788,7 +2800,9 @@ u32 intel_read_rawclk(struct drm_i915_private *dev_priv)
 {
 	u32 freq;
 
-	if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP)
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
+		freq = dg1_rawclk(dev_priv);
+	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP)
 		freq = cnp_rawclk(dev_priv);
 	else if (HAS_PCH_SPLIT(dev_priv))
 		freq = pch_rawclk(dev_priv);
-- 
2.26.2