[Intel-gfx] [PATCH 4/7] drm/i915/skl: Expose DC5/DC6 entry counts

[Mika Kuoppala]

From: Damien Lespiau <damien.lespiau at intel.com>

The CSR firmware expose two counters, handy to check if we are indeed
entering DC5/DC6.

v2: Rebase
v3: Take RPM ref before reading (Imre)

Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com> (v1)
Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
Reviewed-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 11 +++++++++++
 drivers/gpu/drm/i915/i915_reg.h     |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 4ed2797..c30580b 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2810,6 +2810,17 @@ static int i915_dmc_info(struct seq_file *m, void *unused)
 	seq_printf(m, "version: %d.%d\n", CSR_VERSION_MAJOR(csr->version),
 		   CSR_VERSION_MINOR(csr->version));
 
+	intel_runtime_pm_get(dev_priv);
+
+	if (IS_SKYLAKE(dev) && csr->version >= CSR_VERSION(1, 6)) {
+		seq_printf(m, "DC3 -> DC5 count: %d\n",
+			   I915_READ(SKL_CSR_DC3_DC5_COUNT));
+		seq_printf(m, "DC5 -> DC6 count: %d\n",
+			   I915_READ(SKL_CSR_DC5_DC6_COUNT));
+	}
+
+	intel_runtime_pm_put(dev_priv);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8942532..bf9bddd 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5696,6 +5696,10 @@ enum skl_disp_power_wells {
 #define GAMMA_MODE_MODE_12BIT	(2 << 0)
 #define GAMMA_MODE_MODE_SPLIT	(3 << 0)
 
+/* DMC/CSR */
+#define SKL_CSR_DC3_DC5_COUNT	0x80030
+#define SKL_CSR_DC5_DC6_COUNT	0x8002C
+
 /* interrupts */
 #define DE_MASTER_IRQ_CONTROL   (1 << 31)
 #define DE_SPRITEB_FLIP_DONE    (1 << 29)
-- 
2.5.0