[Intel-gfx] [RFC 7/7] drm/i915/tgl: Add DC3CO counter in i915_dmc_info

[Anshuman Gupta]

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 at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Animesh Manna <animesh.manna at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
 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 5e81c4fc13ae..820b9b8febec 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2397,6 +2397,12 @@ 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 d6b6181c1ffd..a0b9289152e9 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7238,6 +7238,8 @@ 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