Adding DC3CO counter in i915_dmc_info debugfs will be
useful for DC3CO validation.
DMC firmware uses DMC_DEBUG3 register as DC3CO counter
register on TGL, as per B.Specs DMC_DEBUG3 is general
purpose register.
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Animesh Manna <animesh.manna@xxxxxxxxx>
Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 6 ++++++
drivers/gpu/drm/i915/i915_reg.h | 2 ++
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 8953336f2ae5..2e4b7d0ec3aa 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2417,6 +2417,12 @@ 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));
+ /*
+ * TGL DMC f/w uses DMC_DEBUG3 register for DC3CO counter.
+ */
+ if (IS_TIGERLAKE(dev_priv))
+ seq_printf(m, "DC3CO count: %d\n", I915_READ(DMC_DEBUG3));
+
if (INTEL_GEN(dev_priv) >= 12) {
dc5_reg = TGL_DMC_DEBUG_DC5_COUNT;
dc6_reg = TGL_DMC_DEBUG_DC6_COUNT;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index efd351c882d3..fa3e5f5340ef 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7280,6 +7280,8 @@ enum {
#define TGL_DMC_DEBUG_DC5_COUNT _MMIO(0x101084)
#define TGL_DMC_DEBUG_DC6_COUNT _MMIO(0x101088)
+#define DMC_DEBUG3 _MMIO(0x101090)
+
/* interrupts */
#define DE_MASTER_IRQ_CONTROL (1 << 31)
#define DE_SPRITEB_FLIP_DONE (1 << 29)
--
2.21.0
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