[Intel-gfx] [PATCH 2/6] drm/i915: Parse EDID probed modes for DRRS support

[Vandana Kannan]

From: Pradeep Bhat <pradeep.bhat at intel.com>

This patch and finds out the lowest refresh rate supported for the resolution
same as the fixed_mode.
It also checks the VBT fields to see if panel supports seamless DRRS or not.
Based on above data it marks whether eDP panel supports seamless DRRS or not.
This information is needed for supporting seamless DRRS switch for certain
power saving usecases. This patch is tested by enabling the DRM logs and
user should see whether Seamless DRRS is supported or not.

v2: Daniel's review comments
Modified downclock deduction based on intel_find_panel_downclock

v3: Chris's review comments
Moved edp_downclock_avail and edp_downclock to intel_panel

v4: Jani's review comments.
Changed name of the enum edp_panel_type to drrs_support type.
Change is_drrs_supported to drrs_support of type enum drrs_support_type.

v5: Incorporated Jani's review comments
Modify intel_dp_drrs_initialize to return downclock mode. Support for Gen7
and above.

v6: Incorporated Chris's review comments.
Changed initialize to init in intel_drrs_initialize

v7: Incorporated Jani's review comments.
Removed edp_downclock and edp_downclock_avail. Return NULL explicitly.
Make drrs_state and unnamed struct. Move Gen based check inside drrs_init.

Signed-off-by: Pradeep Bhat <pradeep.bhat at intel.com>
Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c  |   53 +++++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_drv.h |   16 ++++++++++++
 2 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 59ee4dc..f2735de 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3611,6 +3611,51 @@ intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
 		      I915_READ(pp_div_reg));
 }
 
+static struct drm_display_mode *
+intel_dp_drrs_init(struct intel_digital_port *intel_dig_port,
+			struct intel_connector *intel_connector,
+			struct drm_display_mode *fixed_mode)
+{
+	struct drm_connector *connector = &intel_connector->base;
+	struct intel_dp *intel_dp = &intel_dig_port->dp;
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_display_mode *downclock_mode = NULL;
+
+	if (INTEL_INFO(dev)->gen <= 6) {
+		DRM_INFO("DRRS supported for Gen7 and above\n");
+		return NULL;
+	}
+
+	/**
+	 * Check if PSR is supported by panel and enabled
+	 * if so then DRRS is reported as not supported for Haswell.
+	 */
+	if (INTEL_INFO(dev)->gen < 8 &&	intel_edp_is_psr_enabled(dev)) {
+		DRM_INFO("eDP panel has PSR enabled. Cannot support DRRS\n");
+		return NULL;
+	}
+
+	/* First check if DRRS is enabled from VBT struct */
+	if (dev_priv->vbt.drrs_type == DRRS_NOT_SUPPORTED) {
+		DRM_INFO("VBT doesn't support DRRS\n");
+		return NULL;
+	}
+
+	downclock_mode = intel_find_panel_downclock
+					(dev, fixed_mode, connector);
+
+	if (downclock_mode != NULL &&
+		dev_priv->vbt.drrs_type == SEAMLESS_DRRS_SUPPORT) {
+		intel_dp->drrs_state.type = dev_priv->vbt.drrs_type;
+
+		intel_dp->drrs_state.refresh_rate_type = DRRS_HIGH_RR;
+		DRM_INFO("seamless DRRS supported for eDP panel.\n");
+	}
+
+	return downclock_mode;
+}
+
 static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 				     struct intel_connector *intel_connector,
 				     struct edp_power_seq *power_seq)
@@ -3620,10 +3665,13 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	struct drm_device *dev = intel_dig_port->base.base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_display_mode *fixed_mode = NULL;
+	struct drm_display_mode *downclock_mode = NULL;
 	bool has_dpcd;
 	struct drm_display_mode *scan;
 	struct edid *edid;
 
+	intel_dp->drrs_state.type = DRRS_NOT_SUPPORTED;
+
 	if (!is_edp(intel_dp))
 		return true;
 
@@ -3665,6 +3713,9 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	list_for_each_entry(scan, &connector->probed_modes, head) {
 		if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
 			fixed_mode = drm_mode_duplicate(dev, scan);
+			downclock_mode = intel_dp_drrs_init(
+						intel_dig_port,
+						intel_connector, fixed_mode);
 			break;
 		}
 	}
@@ -3677,7 +3728,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 			fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 	}
 
-	intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
+	intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
 	intel_panel_setup_backlight(connector);
 
 	return true;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index fa99104..d781165 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -483,6 +483,17 @@ struct intel_hdmi {
 
 #define DP_MAX_DOWNSTREAM_PORTS		0x10
 
+/**
+ * HIGH_RR is the highest eDP panel refresh rate read from EDID
+ * LOW_RR is the lowest eDP panel refresh rate found from EDID
+ * parsing for same resolution.
+ */
+enum edp_drrs_refresh_rate_type {
+	DRRS_HIGH_RR,
+	DRRS_LOW_RR,
+	DRRS_MAX_RR, /* RR count */
+};
+
 struct intel_dp {
 	uint32_t output_reg;
 	uint32_t aux_ch_ctl_reg;
@@ -521,6 +532,11 @@ struct intel_dp {
 				     bool has_aux_irq,
 				     int send_bytes,
 				     uint32_t aux_clock_divider);
+	struct {
+		enum drrs_support_type type;
+		enum edp_drrs_refresh_rate_type refresh_rate_type;
+	} drrs_state;
+
 };
 
 struct intel_digital_port {
-- 
1.7.9.5