[PATCH i-g-t 5/9] lib/igt_kms: add igt_reset_connectors_debugfs

[Kunal Joshi <kunal1.joshi@intel.com>]

add igt_reset_connectors_debugfs to clean the state
along with some helpers to get debugfs attribute and default value
to set.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Cc: Karthik B S <karthik.b.s@intel.com>
Signed-off-by: Kunal Joshi <kunal1.joshi@intel.com>
---
 lib/igt_kms.c | 38 ++++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h | 11 +++++++++++
 2 files changed, 49 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index dac822c7a..18605531b 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1495,6 +1495,26 @@ int igt_connector_sysfs_open(int drm_fd,
 	return conn_dir;
 }
 
+static const char *get_debugfs_default_value(enum kmstest_force_debugfs debugfs)
+{
+	switch (debugfs) {
+	case FORCE_JOINER:
+		return "0";
+	default:
+		return "0";
+	}
+}
+
+static const char *get_debugfs_default_attr(enum kmstest_force_debugfs debugfs)
+{
+	switch (debugfs) {
+	case FORCE_JOINER:
+		return "i915_bigjoiner_force_enable";
+	default:
+		return "0";
+	}
+}
+
 static bool connector_is_forced(int idx, drmModeConnector *connector, enum kmstest_force_type type)
 {
 	struct forced_connector *connectors;
@@ -5320,6 +5340,24 @@ void igt_reset_connectors(void)
 		igt_sysfs_set(forced_connectors[i].dir, "status",  "detect");
 }
 
+/**
+ * igt_reset_connectors_debugfs:
+ *
+ * Remove any forced state from the connectors debugfs.
+ */
+void igt_reset_connectors_debugfs(void)
+{
+	/*
+	 * reset the connectors debugfs avoiding any
+	 * functions that are not safe to call in signal handlers
+	 */
+	for (int i = FORCE_JOINER; i < FORCE_DEBUGFS_MAX; i++)
+		for (int j = 0; j < forced_connectors_debugfs[j].connector_type; j++)
+			igt_sysfs_set(forced_connectors_debugfs[i].dir,
+				      get_debugfs_default_attr(i),
+				      get_debugfs_default_value(i));
+}
+
 /**
  * igt_watch_uevents:
  *
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 561edf98b..f676de737 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -256,6 +256,16 @@ enum kmstest_force_type {
 	FORCED_CONNECTOR_MAX
 };
 
+/**
+ * kmstest_force_type:
+ * @FORCED_CONNECTOR: Uses sysfs
+ * @FORCED_CONNECTOR_DEBUGFS: Uses debugfs
+*/
+enum kmstest_force_debugfs {
+	FORCE_JOINER,
+	FORCE_DEBUGFS_MAX
+};
+
 /**
  * intel_broadcast_rgb_mode:
  * @BROADCAST_RGB_AUTO: Choose the color range to use automatically
@@ -1094,6 +1104,7 @@ void igt_pipe_refresh(igt_display_t *display, enum pipe pipe, bool force);
 
 void igt_enable_connectors(int drm_fd);
 void igt_reset_connectors(void);
+void igt_reset_connectors_debugfs(void);
 
 uint32_t kmstest_get_vbl_flag(int crtc_offset);
 
-- 
2.34.1