[Intel-gfx] [PATCH] drm/i915: Add debugfs entry for DRRS

[Ramalingam C]

From: Vandana Kannan <vandana.kannan at intel.com>

Adding a debugfs entry to determine if DRRS is supported or not

V2: [By Ram]: Following details about the active crtc will be filled
	in seq-file of the debugfs
	1. Encoder output type
	2. DRRS Support on this CRTC
	3. DRRS current state
	4. Current Vrefresh
Format is as follows:
CRTC 1:  Output: eDP, DRRS Supported: Yes (Seamless), DRRS_State: DRRS_HIGH_RR, Vrefresh: 60
CRTC 2:  Output: HDMI, DRRS Supported : No, VBT DRRS_type: Seamless
CRTC 1:  Output: eDP, DRRS Supported: Yes (Seamless), DRRS_State: DRRS_LOW_RR, Vrefresh: 40
CRTC 2:  Output: HDMI, DRRS Supported : No, VBT DRRS_type: Seamless

V3: [By Ram]: Readability is improved.
	Another error case is covered [Daniel]

V4: [By Ram]: Current status of the Idleness DRRS along with
	the Front buffer bits are added to the debugfs. [Rodrigo]

Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c |   99 +++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 9af17fb..a2f702a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2855,6 +2855,104 @@ static int i915_ddb_info(struct seq_file *m, void *unused)
 	return 0;
 }
 
+static void drrs_status_per_crtc(struct seq_file *m,
+		struct drm_device *dev, struct intel_crtc *intel_crtc)
+{
+	struct intel_encoder *intel_encoder;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_drrs *drrs = &dev_priv->drrs;
+	int vrefresh = 0;
+
+	for_each_encoder_on_crtc(dev, &intel_crtc->base, intel_encoder) {
+		/* Encoder connected on this CRTC */
+		switch (intel_encoder->type) {
+		case INTEL_OUTPUT_EDP:
+			seq_puts(m, "Output: eDP, ");
+			break;
+		case INTEL_OUTPUT_DSI:
+			seq_puts(m, "Output: DSI, ");
+			break;
+		case INTEL_OUTPUT_HDMI:
+			seq_puts(m, "Output: HDMI, ");
+			break;
+		case INTEL_OUTPUT_DISPLAYPORT:
+			seq_puts(m, "Output: DP, ");
+			break;
+		default:
+			seq_printf(m, "Output: Others (id=%d), ",
+						intel_encoder->type);
+		}
+	}
+
+	if (intel_crtc->config->has_drrs) {
+		struct intel_panel *panel;
+
+		panel = &drrs->dp->attached_connector->panel;
+		/* DRRS Supported */
+		seq_puts(m, "DRRS Supported: Yes (Seamless), ");
+		seq_printf(m, "busy_frontbuffer_bits: 0x%X,\n\t",
+					drrs->busy_frontbuffer_bits);
+
+		if (drrs->busy_frontbuffer_bits) {
+			seq_puts(m, "Front buffer: busy, ");
+			seq_puts(m, "Idleness Timer: Suspended, ");
+		} else {
+			seq_puts(m, "Front buffer: Idle, ");
+			if (drrs->refresh_rate_type == DRRS_HIGH_RR)
+				seq_puts(m, "Idleness Timer: Ticking, ");
+			else
+				seq_puts(m, "Idleness Timer: Suspended, ");
+		}
+
+		if (drrs->refresh_rate_type == DRRS_HIGH_RR) {
+			seq_puts(m, "DRRS_State: DRRS_HIGH_RR, ");
+			vrefresh = panel->fixed_mode->vrefresh;
+		} else if (drrs->refresh_rate_type == DRRS_LOW_RR) {
+			seq_puts(m, "DRRS_State: DRRS_LOW_RR, ");
+			vrefresh = panel->downclock_mode->vrefresh;
+		} else {
+			seq_printf(m, "DRRS_State: Unknown(%d), ",
+						drrs->refresh_rate_type);
+		}
+		seq_printf(m, "Vrefresh: %d", vrefresh);
+
+	} else {
+		/* DRRS not supported. Print the VBT parameter*/
+		seq_puts(m, "DRRS Supported : No, ");
+		if (dev_priv->vbt.drrs_type == STATIC_DRRS_SUPPORT)
+			seq_puts(m, "VBT DRRS_type: Static");
+		else if (dev_priv->vbt.drrs_type == SEAMLESS_DRRS_SUPPORT)
+			seq_puts(m, "VBT DRRS_type: Seamless");
+		else if (dev_priv->vbt.drrs_type == DRRS_NOT_SUPPORTED)
+			seq_puts(m, "VBT DRRS_type: None");
+		else
+			seq_puts(m, "VBT DRRS_type: Unrecognized Value");
+	}
+	seq_puts(m, "\n");
+}
+
+static int i915_drrs_status(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct intel_crtc *intel_crtc;
+	int active_crtc_cnt = 0;
+
+	for_each_intel_crtc(dev, intel_crtc) {
+		if (intel_crtc->active) {
+			active_crtc_cnt++;
+			seq_printf(m, "CRTC %d:  ", active_crtc_cnt);
+
+			drrs_status_per_crtc(m, dev, intel_crtc);
+		}
+	}
+
+	if (!active_crtc_cnt)
+		seq_puts(m, "No active crtc found\n");
+
+	return 0;
+}
+
 struct pipe_crc_info {
 	const char *name;
 	struct drm_device *dev;
@@ -4469,6 +4567,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_dp_mst_info", i915_dp_mst_info, 0},
 	{"i915_wa_registers", i915_wa_registers, 0},
 	{"i915_ddb_info", i915_ddb_info, 0},
+	{"i915_drrs_status", i915_drrs_status, 0},
 };
 #define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)
 
-- 
1.7.9.5