drm/i915: provide self-refresh status in debugfs

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 96e8b9b2cb32..56095b3d28ce 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -525,6 +525,26 @@ static int i915_fbc_status(struct seq_file *m, void *unused)
         return 0;
 }
 
+static int i915_sr_status(struct seq_file *m, void *unused)
+{
+        struct drm_info_node *node = (struct drm_info_node *) m->private;
+        struct drm_device *dev = node->minor->dev;
+        drm_i915_private_t *dev_priv = dev->dev_private;
+        bool sr_enabled = false;
+
+        if (IS_I965G(dev) || IS_I945G(dev) || IS_I945GM(dev))
+                sr_enabled = I915_READ(FW_BLC_SELF) & FW_BLC_SELF_EN;
+        else if (IS_I915GM(dev))
+                sr_enabled = I915_READ(INSTPM) & INSTPM_SELF_EN;
+        else if (IS_PINEVIEW(dev))
+                sr_enabled = I915_READ(DSPFW3) & PINEVIEW_SELF_REFRESH_EN;
+
+        seq_printf(m, "self-refresh: %s\n", sr_enabled ? "enabled" :
+                   "disabled");
+
+        return 0;
+}
+
 static int
 i915_wedged_open(struct inode *inode,
                  struct file *filp)
@@ -648,6 +668,7 @@ static struct drm_info_list i915_debugfs_list[] = {
         {"i915_inttoext_table", i915_inttoext_table, 0},
         {"i915_drpc_info", i915_drpc_info, 0},
         {"i915_fbc_status", i915_fbc_status, 0},
+        {"i915_sr_status", i915_sr_status, 0},
 };
 #define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)