[Intel-gfx] [PATCH v2] drm/i915/debugfs : PM_REQ and PM_RES registers

[Saichandana S]

From: Saichandana <saichandana.s at intel.com>

PM_REQ register provides the value of the last PM request from PCU to
Display Engine.PM_RES register provides the value of the last PM
response from Display Engine to PCU.This debugfs will be used by
DC9 IGT test to know about "DC9 Ready" status.

B.Spec : 49501, 49502

Signed-off-by: Saichandana <saichandana.s at intel.com>
---
 .../drm/i915/display/intel_display_debugfs.c  | 30 +++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h               |  8 +++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index cd7e5519ee7d..551fb1a90bb3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -559,6 +559,36 @@ static int i915_dmc_info(struct seq_file *m, void *unused)
 	return 0;
 }
 
+static int i915_pm_req_res_info(struct seq_file *m, void *unused)
+{
+	struct drm_i915_private *dev_priv = node_to_i915(m->private);
+	struct intel_csr *csr = &dev_priv->csr;
+	const char *status;
+
+	if (!HAS_CSR(dev_priv))
+		return -ENODEV;
+	if (!csr->dmc_payload)
+		return 0;
+	seq_printf(m, "PM debug request 0 (0x45284): 0x%08x\n",
+		   intel_de_read(dev_priv, PM_REQ_DBG_0));
+	seq_printf(m, "PM debug request 1 (0x45288): 0x%08x\n",
+		   intel_de_read(dev_priv, PM_REQ_DBG_1));
+	seq_printf(m, "PM debug response 0 (0x4528C): 0x%08x\n",
+		   intel_de_read(dev_priv, PM_RSP_DBG_0));
+	seq_printf(m, "PM debug response 1 (0x45290): 0x%08x\n",
+		   intel_de_read(dev_priv, PM_RSP_DBG_1));
+	status = (intel_de_read(dev_priv, PM_RSP_DBG_1) & MASK_DC9_BIT) ? "yes" : "no";
+
+	seq_printf(m, "Time to Next Fill = 0x%0x\n",
+		   (intel_de_read(dev_priv, PM_RSP_DBG_0) & ~MASK_RSP_0));
+	seq_printf(m, "Time to Next VBI = 0x%0x\n",
+		   ((intel_de_read(dev_priv, PM_RSP_DBG_0) & MASK_RSP_0)) >> 16);
+	seq_printf(m, "Selective Exit Latency = 0x%0x\n",
+		   (intel_de_read(dev_priv, PM_RSP_DBG_1) & MASK_RSP_1));
+	seq_printf(m, "DC9 Ready = %s\n", status);
+	return 0;
+}
+
 static void intel_seq_print_mode(struct seq_file *m, int tabs,
 				 const struct drm_display_mode *mode)
 {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0023c023f472..3e9ed555f928 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -371,6 +371,14 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define VLV_G3DCTL		_MMIO(0x9024)
 #define VLV_GSCKGCTL		_MMIO(0x9028)
 
+#define PM_REQ_DBG_0		_MMIO(0x45284)
+#define PM_REQ_DBG_1		_MMIO(0x45288)
+#define PM_RSP_DBG_0		_MMIO(0x4528C)
+#define PM_RSP_DBG_1		_MMIO(0x45290)
+#define MASK_RSP_0		(0xFFFF << 16)
+#define MASK_RSP_1		(7 << 0)
+#define MASK_DC9_BIT		(1 << 17)
+
 #define GEN6_MBCTL		_MMIO(0x0907c)
 #define   GEN6_MBCTL_ENABLE_BOOT_FETCH	(1 << 4)
 #define   GEN6_MBCTL_CTX_FETCH_NEEDED	(1 << 3)
-- 
2.17.1