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

[Ramalingam C <ramalingam.c@xxxxxxxxx>]

From: Vandana Kannan <vandana.kannan@xxxxxxxxx>

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

Signed-off-by: Vandana Kannan <vandana.kannan@xxxxxxxxx>
Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_debugfs.c |   93 +++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 2ad4c48..47f1f65 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2819,6 +2819,98 @@ static int i915_ddb_info(struct seq_file *m, void *unused)
 	return 0;
 }
 
+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 drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_drrs *drrs = &dev_priv->drrs;
+	struct intel_crtc *intel_crtc;
+	struct intel_encoder *intel_encoder;
+	int active_crtc_cnt = 0, vrefresh = 0;
+
+	for_each_intel_crtc(dev, intel_crtc) {
+		if (intel_crtc->active) {
+			active_crtc_cnt++;
+			seq_puts(m, "CRTC");
+			seq_put_decimal_ull(m, ' ', active_crtc_cnt);
+			seq_puts(m, ":  ");
+			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_puts(m, "Output: Others (id");
+					seq_put_decimal_ull(m, '=',
+							intel_encoder->type);
+					seq_puts(m, "), ");
+				}
+			}
+
+			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), ");
+				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_puts(m, "DRRS_State: Unknown");
+					seq_put_decimal_ull(m, '(',
+						drrs->refresh_rate_type);
+					seq_puts(m, "), ");
+				}
+				seq_puts(m, "Vrefresh:");
+				seq_put_decimal_ull(m, ' ', 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");
+				}
+			}
+			seq_puts(m, "\n");
+		}
+	}
+
+	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;
@@ -4433,6 +4525,7 @@ 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

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