drm/i915/bxt: Expose DC5 entry count

For bxt CSR firmware exposes a count of dc5 entries. Expose
it through debugs
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: NImre Deak <imre.deak@intel.com>
Tested-by: Daniel Stone <daniels@collabora.com> # SKL
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2818,6 +2818,9 @@ static int i915_dmc_info(struct seq_file *m, void *unused)
 			   I915_READ(SKL_CSR_DC3_DC5_COUNT));
 		seq_printf(m, "DC5 -> DC6 count: %d\n",
 			   I915_READ(SKL_CSR_DC5_DC6_COUNT));
+	} else if (IS_BROXTON(dev) && csr->version >= CSR_VERSION(1, 4)) {
+		seq_printf(m, "DC3 -> DC5 count: %d\n",
+			   I915_READ(BXT_CSR_DC3_DC5_COUNT));
 	}
 
 	intel_runtime_pm_put(dev_priv);

drivers/gpu/drm/i915/i915_reg.h

@@ -5700,6 +5700,7 @@ enum skl_disp_power_wells {
 /* DMC/CSR */
 #define SKL_CSR_DC3_DC5_COUNT	0x80030
 #define SKL_CSR_DC5_DC6_COUNT	0x8002C
+#define BXT_CSR_DC3_DC5_COUNT	0x80038
 
 /* interrupts */
 #define DE_MASTER_IRQ_CONTROL   (1 << 31)