From: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Introduce correspondent definitions and for choosing between CD2X CDCLK
and PLL CDCLK as a source.
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_cdclk.c | 14 ++++++++++++--
drivers/gpu/drm/i915/i915_reg.h | 3 +++
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index ed45a2cf5c9a..04937aaabcee 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -1932,8 +1932,7 @@ static void _bxt_set_cdclk(struct drm_i915_private *dev_priv,
dg2_cdclk_squash_program(dev_priv, waveform);
val = bxt_cdclk_cd2x_div_sel(dev_priv, clock, vco) |
- bxt_cdclk_cd2x_pipe(dev_priv, pipe) |
- skl_cdclk_decimal(cdclk);
+ bxt_cdclk_cd2x_pipe(dev_priv, pipe);
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
@@ -1942,6 +1941,17 @@ static void _bxt_set_cdclk(struct drm_i915_private *dev_priv,
if ((IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) &&
cdclk >= 500000)
val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
+
+ if (DISPLAY_VER(dev_priv) >= 20)
+ /*
+ * Using CDCLK through PLL seems to be always better option when
+ * its supported, both in terms of performance and power
+ * consumption.
+ */
+ val |= CDCLK_SOURCE_SEL_CDCLK_PLL;
+ else
+ val |= skl_cdclk_decimal(cdclk);
+
intel_de_write(dev_priv, CDCLK_CTL, val);
if (pipe != INVALID_PIPE)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fa85530afac3..d5850761a75a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5933,6 +5933,9 @@ enum skl_power_gate {
#define CDCLK_FREQ_540 REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 1)
#define CDCLK_FREQ_337_308 REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 2)
#define CDCLK_FREQ_675_617 REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 3)
+#define CDCLK_SOURCE_SEL_MASK REG_BIT(25)
+#define CDCLK_SOURCE_SEL_CD2X REG_FIELD_PREP(CDCLK_SOURCE_SEL_MASK, 0)
+#define CDCLK_SOURCE_SEL_CDCLK_PLL REG_FIELD_PREP(CDCLK_SOURCE_SEL_MASK, 1)
#define BXT_CDCLK_CD2X_DIV_SEL_MASK REG_GENMASK(23, 22)
#define BXT_CDCLK_CD2X_DIV_SEL_1 REG_FIELD_PREP(BXT_CDCLK_CD2X_DIV_SEL_MASK, 0)
#define BXT_CDCLK_CD2X_DIV_SEL_1_5 REG_FIELD_PREP(BXT_CDCLK_CD2X_DIV_SEL_MASK, 1)
--
2.40.1
