drm/radeon/dpm: add debugfs support for 7xx/evergreen/btc

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

@@ -1392,6 +1392,7 @@ static struct radeon_asic rv770_asic = {
 		.get_sclk = &rv770_dpm_get_sclk,
 		.get_mclk = &rv770_dpm_get_mclk,
 		.print_power_state = &rv770_dpm_print_power_state,
+		.debugfs_print_current_performance_level = &rv770_dpm_debugfs_print_current_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &rs600_pre_page_flip,
@@ -1514,6 +1515,7 @@ static struct radeon_asic evergreen_asic = {
 		.get_sclk = &rv770_dpm_get_sclk,
 		.get_mclk = &rv770_dpm_get_mclk,
 		.print_power_state = &rv770_dpm_print_power_state,
+		.debugfs_print_current_performance_level = &rv770_dpm_debugfs_print_current_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,
@@ -1758,6 +1760,7 @@ static struct radeon_asic btc_asic = {
 		.get_sclk = &btc_dpm_get_sclk,
 		.get_mclk = &btc_dpm_get_mclk,
 		.print_power_state = &rv770_dpm_print_power_state,
+		.debugfs_print_current_performance_level = &rv770_dpm_debugfs_print_current_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -476,6 +476,8 @@ u32 rv770_dpm_get_sclk(struct radeon_device *rdev, bool low);
 u32 rv770_dpm_get_mclk(struct radeon_device *rdev, bool low);
 void rv770_dpm_print_power_state(struct radeon_device *rdev,
 				 struct radeon_ps *ps);
+void rv770_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						       struct seq_file *m);
 
 /*
  * evergreen

drivers/gpu/drm/radeon/rv770_dpm.c

@@ -2430,6 +2430,36 @@ void rv770_dpm_print_power_state(struct radeon_device *rdev,
 	r600_dpm_print_ps_status(rdev, rps);
 }
 
+void rv770_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						       struct seq_file *m)
+{
+	struct radeon_ps *rps = rdev->pm.dpm.current_ps;
+	struct rv7xx_ps *ps = rv770_get_ps(rps);
+	struct rv7xx_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);
+		if (rdev->family >= CHIP_CEDAR) {
+			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);
+		} else {
+			seq_printf(m, "power level %d    sclk: %u mclk: %u vddc: %u\n",
+				   current_index, pl->sclk, pl->mclk, pl->vddc);
+		}
+	}
+}
+
 void rv770_dpm_fini(struct radeon_device *rdev)
 {
 	int i;

drivers/gpu/drm/radeon/rv770d.h

@@ -207,6 +207,10 @@
 #       define MUX_TCLK_TO_XCLK                           (1 << 8)
 #       define XTALIN_DIVIDE                              (1 << 9)
 
+#define TARGET_AND_CURRENT_PROFILE_INDEX                  0x66c
+#       define CURRENT_PROFILE_INDEX_MASK                 (0xf << 4)
+#       define CURRENT_PROFILE_INDEX_SHIFT                4
+
 #define S0_VID_LOWER_SMIO_CNTL                            0x678
 #define S1_VID_LOWER_SMIO_CNTL                            0x67c
 #define S2_VID_LOWER_SMIO_CNTL                            0x680