[Intel-gfx] [PATCH 38/62] drm/i915/bdw: get the correct LCPLL frequency on Broadwell

[Ben Widawsky]

From: Paulo Zanoni <paulo.r.zan...@intel.com>

v2: Rebased onto Paulo's MHz->kHz change.

v3: Rebased on top of the Haswell pc8+ adjustements.

Reviewed-by: Jani Nikula <jani.nik...@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com> (v1)
Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_reg.h  |  3 +++
 drivers/gpu/drm/i915/intel_ddi.c | 25 ++++++++++++++++++-------
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 68b877d..d5995dd 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5282,6 +5282,9 @@
 #define  LCPLL_PLL_LOCK                        (1<<30)
 #define  LCPLL_CLK_FREQ_MASK           (3<<26)
 #define  LCPLL_CLK_FREQ_450            (0<<26)
+#define  LCPLL_CLK_FREQ_54O_BDW                (1<<26)
+#define  LCPLL_CLK_FREQ_337_5_BDW      (2<<26)
+#define  LCPLL_CLK_FREQ_675_BDW                (3<<26)
 #define  LCPLL_CD_CLOCK_DISABLE                (1<<25)
 #define  LCPLL_CD2X_CLOCK_DISABLE      (1<<23)
 #define  LCPLL_POWER_DOWN_ALLOW                (1<<22)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 31f4fe2..d464fd2 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1156,18 +1156,29 @@ static void intel_disable_ddi(struct intel_encoder 
*intel_encoder)
 
 int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
 {
+       struct drm_device *dev = dev_priv->dev;
        uint32_t lcpll = I915_READ(LCPLL_CTL);
+       uint32_t freq = lcpll & LCPLL_CLK_FREQ_MASK;
 
-       if (lcpll & LCPLL_CD_SOURCE_FCLK)
+       if (lcpll & LCPLL_CD_SOURCE_FCLK) {
                return 800000;
-       else if (I915_READ(HSW_FUSE_STRAP) & HSW_CDCLK_LIMIT)
+       } else if (I915_READ(HSW_FUSE_STRAP) & HSW_CDCLK_LIMIT) {
                return 450000;
-       else if ((lcpll & LCPLL_CLK_FREQ_MASK) == LCPLL_CLK_FREQ_450)
+       } else if (freq == LCPLL_CLK_FREQ_450) {
                return 450000;
-       else if (IS_ULT(dev_priv->dev))
-               return 337500;
-       else
-               return 540000;
+       } else if (IS_HASWELL(dev)) {
+               if (IS_ULT(dev))
+                       return 338000;
+               else
+                       return 540000;
+       } else {
+               if (freq == LCPLL_CLK_FREQ_54O_BDW)
+                       return 540000;
+               else if (freq == LCPLL_CLK_FREQ_337_5_BDW)
+                       return 338000;
+               else
+                       return 675000;
+       }
 }
 
 void intel_ddi_pll_init(struct drm_device *dev)
-- 
1.8.4.2

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