[Intel-gfx] [PATCH 3/3] drm/i915: Correctly enable CLKOUT_DP for ULT platoforms

[Damien Lespiau]

From: Damien Lespiau <damien.lespiau at intel.com>

SBI_GEN0 is used instead of SBI_DBUFF0 on ULT platforms.

Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      |    2 ++
 drivers/gpu/drm/i915/intel_display.c |   12 +++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index acf768d..90c4f43 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4563,6 +4563,8 @@
 #define   SBI_SSCAUXDIV_FINALDIV2SEL(x)		((x)<<4)
 #define  SBI_DBUFF0				0x2a00
 #define   SBI_DBUFF0_ENABLE			(1<<0)
+#define  SBI_GEN0				0x1f00
+#define   SBI_GEN0_ENABLE			(1<<0)
 
 /* LPT PIXCLK_GATE */
 #define PIXCLK_GATE			0xC6020
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0eba466..6472065 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5132,9 +5132,15 @@ static void lpt_init_pch_refclk(struct drm_device *dev)
 		intel_sbi_write(dev_priv, 0x21EC, tmp, SBI_MPHY);
 	}
 
-	tmp = intel_sbi_read(dev_priv, SBI_DBUFF0, SBI_ICLK);
-	tmp |= SBI_DBUFF0_ENABLE;
-	intel_sbi_write(dev_priv, SBI_DBUFF0, tmp, SBI_ICLK);
+	if (IS_ULT(dev)) {
+		tmp = intel_sbi_read(dev_priv, SBI_GEN0, SBI_ICLK);
+		tmp |= SBI_GEN0_ENABLE;
+		intel_sbi_write(dev_priv, SBI_GEN0, tmp, SBI_ICLK);
+	} else {
+		tmp = intel_sbi_read(dev_priv, SBI_DBUFF0, SBI_ICLK);
+		tmp |= SBI_DBUFF0_ENABLE;
+		intel_sbi_write(dev_priv, SBI_DBUFF0, tmp, SBI_ICLK);
+	}
 }
 
 /*
-- 
1.7.7.5