[Intel-gfx] [PATCH 12/15] drm/i915: Force CL2 off in CHV x1 PHY

[ville.syrjala at linux.intel.com]

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

We can choose to leave the display PHY CL2 powerdown up to some hardware
signals, or we can force it. The BXT code forces the nonexistent CL2 in
the x1 PHY to power down. Follow suit on CHV. Maybe it can still save
some extra power by disabling some extra logic in CL1, or something.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h         | 1 +
 drivers/gpu/drm/i915/intel_runtime_pm.c | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8010200..395f556 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1139,6 +1139,7 @@ enum skl_disp_power_wells {
 #define   DPIO_SUS_CLK_CONFIG_GATE_CLKREQ	(3 << 0)
 
 #define CHV_CMN_DW30			0x8178
+#define   DPIO_CL2_LDOFUSE_PWRENB	(1 << 6)
 #define   DPIO_LRC_BYPASS		(1 << 3)
 
 #define _TXLANE(ch, lane, offset) ((ch ? 0x2400 : 0) + \
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 37e4375..002b78f 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -980,6 +980,15 @@ static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 		tmp = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW6_CH1);
 		tmp |= DPIO_DYNPWRDOWNEN_CH1;
 		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW6_CH1, tmp);
+	} else {
+		/*
+		 * Force the non-existing CL2 off. BXT does this
+		 * too, so maybe it saves some power even though
+		 * CL2 doesn't exist?
+		 */
+		tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30);
+		tmp |= DPIO_CL2_LDOFUSE_PWRENB;
+		vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, tmp);
 	}
 
 	mutex_unlock(&dev_priv->sb_lock);
-- 
2.3.6