[PATCH] drm/i915/dmc: Add debugfs for dc6 counter

[Mohammed Thasleem <mohammed.thasleem@intel.com>]

Starting from MTl we don't have a platform agnostic way to validate DC6 state
due to dc6 counter has been removed to validate DC state.
Adding dc6_entry_counter at display dirver to validate dc6 state.

Signed-off-by: Mohammed Thasleem <mohammed.thasleem@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_core.h       | 1 +
 drivers/gpu/drm/i915/display/intel_display_power_well.c | 2 ++
 drivers/gpu/drm/i915/display/intel_dmc.c                | 1 +
 3 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
index 554870d2494b..cc244617011f 100644
--- a/drivers/gpu/drm/i915/display/intel_display_core.h
+++ b/drivers/gpu/drm/i915/display/intel_display_core.h
@@ -376,6 +376,7 @@ struct intel_display {
 	struct {
 		struct intel_dmc *dmc;
 		intel_wakeref_t wakeref;
+		u32 dc6_entry_counter;
 	} dmc;
 
 	struct {
diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c b/drivers/gpu/drm/i915/display/intel_display_power_well.c
index f45a4f9ba23c..0eb178aa618d 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
@@ -869,6 +869,8 @@ void skl_enable_dc6(struct intel_display *display)
 	intel_dmc_wl_enable(display, DC_STATE_EN_UPTO_DC6);
 
 	gen9_set_dc_state(display, DC_STATE_EN_UPTO_DC6);
+
+	display->dmc.dc6_entry_counter++;
 }
 
 void bxt_enable_dc9(struct intel_display *display)
diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
index 221d3abda791..f51bd8e6011d 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -1293,6 +1293,7 @@ static int intel_dmc_debugfs_status_show(struct seq_file *m, void *unused)
 	if (i915_mmio_reg_valid(dc6_reg))
 		seq_printf(m, "DC5 -> DC6 count: %d\n",
 			   intel_de_read(display, dc6_reg));
+	seq_printf(m, "DC6 entry count: %d\n", display->dmc.dc6_entry_counter);
 
 	seq_printf(m, "program base: 0x%08x\n",
 		   intel_de_read(display, DMC_PROGRAM(dmc->dmc_info[DMC_FW_MAIN].start_mmioaddr, 0)));
-- 
2.43.0