drm/radeon/dpm: add debugfs support for cayman

This allows you to look at the current DPM state via
debugfs.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ni_dpm.c

@@ -4287,6 +4287,26 @@ void ni_dpm_print_power_state(struct radeon_device *rdev,
 	r600_dpm_print_ps_status(rdev, rps);
 }
 
+void ni_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						    struct seq_file *m)
+{
+	struct radeon_ps *rps = rdev->pm.dpm.current_ps;
+	struct ni_ps *ps = ni_get_ps(rps);
+	struct rv7xx_pl *pl;
+	u32 current_index =
+		(RREG32(TARGET_AND_CURRENT_PROFILE_INDEX) & CURRENT_STATE_INDEX_MASK) >>
+		CURRENT_STATE_INDEX_SHIFT;
+
+	if (current_index >= ps->performance_level_count) {
+		seq_printf(m, "invalid dpm profile %d\n", current_index);
+	} else {
+		pl = &ps->performance_levels[current_index];
+		seq_printf(m, "uvd    vclk: %d dclk: %d\n", rps->vclk, rps->dclk);
+		seq_printf(m, "power level %d    sclk: %u mclk: %u vddc: %u vddci: %u\n",
+			   current_index, pl->sclk, pl->mclk, pl->vddc, pl->vddci);
+	}
+}
+
 u32 ni_dpm_get_sclk(struct radeon_device *rdev, bool low)
 {
 	struct evergreen_power_info *eg_pi = evergreen_get_pi(rdev);

drivers/gpu/drm/radeon/nid.h

@@ -618,6 +618,10 @@
 #       define MRDCKD0_BYPASS                           (1 << 30)
 #       define MRDCKD1_BYPASS                           (1 << 31)
 
+#define TARGET_AND_CURRENT_PROFILE_INDEX                  0x66c
+#       define CURRENT_STATE_INDEX_MASK                   (0xf << 4)
+#       define CURRENT_STATE_INDEX_SHIFT                  4
+
 #define CG_AT                                           0x6d4
 #       define CG_R(x)					((x) << 0)
 #       define CG_R_MASK				(0xffff << 0)

drivers/gpu/drm/radeon/radeon_asic.c

@@ -1936,6 +1936,7 @@ static struct radeon_asic cayman_asic = {
 		.get_sclk = &ni_dpm_get_sclk,
 		.get_mclk = &ni_dpm_get_mclk,
 		.print_power_state = &ni_dpm_print_power_state,
+		.debugfs_print_current_performance_level = &ni_dpm_debugfs_print_current_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -613,6 +613,8 @@ u32 ni_dpm_get_sclk(struct radeon_device *rdev, bool low);
 u32 ni_dpm_get_mclk(struct radeon_device *rdev, bool low);
 void ni_dpm_print_power_state(struct radeon_device *rdev,
 			      struct radeon_ps *ps);
+void ni_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						    struct seq_file *m);
 int trinity_dpm_init(struct radeon_device *rdev);
 int trinity_dpm_enable(struct radeon_device *rdev);
 void trinity_dpm_disable(struct radeon_device *rdev);