@@ -2413,6 +2413,13 @@ static int i915_dmc_info(struct seq_file *m, void *unused)
if (INTEL_GEN(dev_priv) >= 12) {
dc5_reg = TGL_DMC_DEBUG_DC5_COUNT;
dc6_reg = TGL_DMC_DEBUG_DC6_COUNT;
+ /*
+ * NOTE: DMC_DEBUG3 is a general purpose reg.
+ * According to B.Specs:49196 DMC f/w reuses DC5/6 counter
+ * reg for DC3CO debugging and validation,
+ * but TGL DMC f/w is using DMC_DEBUG3 reg for DC3CO counter.
+ */
+ seq_printf(m, "DC3CO count: %d\n", I915_READ(DMC_DEBUG3));
} else {
dc5_reg = IS_BROXTON(dev_priv) ? BXT_CSR_DC3_DC5_COUNT :
SKL_CSR_DC3_DC5_COUNT;
@@ -7267,6 +7267,8 @@ 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)
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. v1: comment modification for DMC_DBUG3. using GEN >= 12 check instead of IS_TIGERLAKE() to print DMC_DEBUG3 counter value. Cc: Jani Nikula <jani.nikula@intel.com> Cc: Imre Deak <imre.deak@intel.com> Cc: Animesh Manna <animesh.manna@intel.com> Reviewed-by: Imre Deak <imre.deak@intel.com> Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com> --- drivers/gpu/drm/i915/i915_debugfs.c | 7 +++++++ drivers/gpu/drm/i915/i915_reg.h | 2 ++ 2 files changed, 9 insertions(+)