[Intel-gfx] [PATCH v3 28/30] drm/i915/dg2: Update lane disable power state during PSR

[Matt Roper]

From: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>

The PSR enable/disable sequences now require that we program an extra
register in the PHY to adjust the lane disable power setting.

Bspec: 49274
Bspec: 53885
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c      |  7 +++++++
 drivers/gpu/drm/i915/display/intel_snps_phy.c | 14 ++++++++++++++
 drivers/gpu/drm/i915/display/intel_snps_phy.h |  3 +++
 drivers/gpu/drm/i915/i915_reg.h               |  3 +++
 4 files changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index f84930e7c6dd..a3fcd5ebfe48 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -32,6 +32,7 @@
 #include "intel_dp_aux.h"
 #include "intel_hdmi.h"
 #include "intel_psr.h"
+#include "intel_snps_phy.h"
 #include "intel_sprite.h"
 #include "skl_universal_plane.h"
 
@@ -1212,6 +1213,7 @@ static void intel_psr_enable_locked(struct intel_dp *intel_dp,
 {
 	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	enum phy phy = intel_port_to_phy(dev_priv, dig_port->base.port);
 	struct intel_encoder *encoder = &dig_port->base;
 	u32 val;
 
@@ -1237,6 +1239,7 @@ static void intel_psr_enable_locked(struct intel_dp *intel_dp,
 	intel_dp_compute_psr_vsc_sdp(intel_dp, crtc_state, conn_state,
 				     &intel_dp->psr.vsc);
 	intel_write_dp_vsc_sdp(encoder, crtc_state, &intel_dp->psr.vsc);
+	intel_snps_phy_update_psr_power_state(dev_priv, phy, true);
 	intel_psr_enable_sink(intel_dp);
 	intel_psr_enable_source(intel_dp);
 	intel_dp->psr.enabled = true;
@@ -1333,6 +1336,8 @@ static void intel_psr_wait_exit_locked(struct intel_dp *intel_dp)
 static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	enum phy phy = intel_port_to_phy(dev_priv,
+					 dp_to_dig_port(intel_dp)->base.port);
 
 	lockdep_assert_held(&intel_dp->psr.lock);
 
@@ -1358,6 +1363,8 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 			     TRANS_SET_CONTEXT_LATENCY(intel_dp->psr.transcoder),
 			     TRANS_SET_CONTEXT_LATENCY_MASK, 0);
 
+	intel_snps_phy_update_psr_power_state(dev_priv, phy, false);
+
 	/* Disable PSR on Sink */
 	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
 
diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.c b/drivers/gpu/drm/i915/display/intel_snps_phy.c
index f0c30d3d2dfb..18b52b64af95 100644
--- a/drivers/gpu/drm/i915/display/intel_snps_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_snps_phy.c
@@ -36,6 +36,20 @@ void intel_snps_phy_wait_for_calibration(struct drm_i915_private *dev_priv)
 	}
 }
 
+void intel_snps_phy_update_psr_power_state(struct drm_i915_private *dev_priv,
+					   enum phy phy, bool enable)
+{
+	u32 val;
+
+	if (!intel_phy_is_snps(dev_priv, phy))
+		return;
+
+	val = REG_FIELD_PREP(SNPS_PHY_TX_REQ_LN_DIS_PWR_STATE_PSR,
+			     enable ? 2 : 3);
+	intel_uncore_rmw(&dev_priv->uncore, SNPS_PHY_TX_REQ(phy),
+			 SNPS_PHY_TX_REQ_LN_DIS_PWR_STATE_PSR, val);
+}
+
 static const u32 dg2_ddi_translations[] = {
 	/* VS 0, pre-emph 0 */
 	REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 26),
diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.h b/drivers/gpu/drm/i915/display/intel_snps_phy.h
index 6aa33ff729ec..6261ff88ef5c 100644
--- a/drivers/gpu/drm/i915/display/intel_snps_phy.h
+++ b/drivers/gpu/drm/i915/display/intel_snps_phy.h
@@ -12,8 +12,11 @@ struct drm_i915_private;
 struct intel_encoder;
 struct intel_crtc_state;
 struct intel_mpllb_state;
+enum phy;
 
 void intel_snps_phy_wait_for_calibration(struct drm_i915_private *dev_priv);
+void intel_snps_phy_update_psr_power_state(struct drm_i915_private *dev_priv,
+					   enum phy phy, bool enable);
 
 int intel_mpllb_calc_state(struct intel_crtc_state *crtc_state,
 			   struct intel_encoder *encoder);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index d990f9364157..86fc34f1e949 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2340,6 +2340,9 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define SNPS_PHY_REF_CONTROL(phy)		_MMIO_SNPS(phy, 0x168188)
 #define   SNPS_PHY_REF_CONTROL_REF_RANGE	REG_GENMASK(31, 27)
 
+#define SNPS_PHY_TX_REQ(phy)			_MMIO_SNPS(phy, 0x168200)
+#define   SNPS_PHY_TX_REQ_LN_DIS_PWR_STATE_PSR	REG_GENMASK(31, 30)
+
 #define SNPS_PHY_TX_EQ(ln, phy)			_MMIO_SNPS_LN(ln, phy, 0x168300)
 #define   SNPS_PHY_TX_EQ_MAIN			REG_GENMASK(23, 18)
 #define   SNPS_PHY_TX_EQ_POST			REG_GENMASK(15, 10)
-- 
2.25.4