drm/radeon/dpm: add debugfs support for rv6xx

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/radeon_asic.c

@@ -1160,6 +1160,7 @@ static struct radeon_asic rv6xx_asic = {
 		.get_sclk = &rv6xx_dpm_get_sclk,
 		.get_mclk = &rv6xx_dpm_get_mclk,
 		.print_power_state = &rv6xx_dpm_print_power_state,
+		.debugfs_print_current_performance_level = &rv6xx_dpm_debugfs_print_current_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &rs600_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -416,6 +416,8 @@ u32 rv6xx_dpm_get_sclk(struct radeon_device *rdev, bool low);
 u32 rv6xx_dpm_get_mclk(struct radeon_device *rdev, bool low);
 void rv6xx_dpm_print_power_state(struct radeon_device *rdev,
 				 struct radeon_ps *ps);
+void rv6xx_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						       struct seq_file *m);
 /* rs780 dpm */
 int rs780_dpm_init(struct radeon_device *rdev);
 int rs780_dpm_enable(struct radeon_device *rdev);

drivers/gpu/drm/radeon/rv6xx_dpm.c

@@ -2027,6 +2027,31 @@ void rv6xx_dpm_print_power_state(struct radeon_device *rdev,
 	r600_dpm_print_ps_status(rdev, rps);
 }
 
+void rv6xx_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						       struct seq_file *m)
+{
+	struct radeon_ps *rps = rdev->pm.dpm.current_ps;
+	struct rv6xx_ps *ps = rv6xx_get_ps(rps);
+	struct rv6xx_pl *pl;
+	u32 current_index =
+		(RREG32(TARGET_AND_CURRENT_PROFILE_INDEX) & CURRENT_PROFILE_INDEX_MASK) >>
+		CURRENT_PROFILE_INDEX_SHIFT;
+
+	if (current_index > 2) {
+		seq_printf(m, "invalid dpm profile %d\n", current_index);
+	} else {
+		if (current_index == 0)
+			pl = &ps->low;
+		else if (current_index == 1)
+			pl = &ps->medium;
+		else /* current_index == 2 */
+			pl = &ps->high;
+		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\n",
+			   current_index, pl->sclk, pl->mclk, pl->vddc);
+	}
+}
+
 void rv6xx_dpm_fini(struct radeon_device *rdev)
 {
 	int i;