[igt-dev] [PATCH i-g-t 1/2] lib/igt_debugfs: added helper to enable/disable dark screen detection

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

added helper function for dark screen detection

Cc: Nemesa Garg <nemesa.garg@intel.com>
Cc: Arun R Murthy <arun.r.murthy@intel.com>
Cc: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Signed-off-by: Kunal Joshi <kunal1.joshi@intel.com>
---
 lib/igt_debugfs.c | 41 +++++++++++++++++++++++++++++++++++++++++
 lib/igt_debugfs.h |  3 +++
 2 files changed, 44 insertions(+)

diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index a7b54bae5..e2a4b17ea 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -743,3 +743,44 @@ void __igt_debugfs_dump(int device, const char *filename, int level)
 	igt_log(IGT_LOG_DOMAIN, level, "%s:\n%s\n", filename, contents);
 	free(contents);
 }
+
+bool igt_is_dark_screen_supported(int drm_fd, enum pipe pipe)
+{
+        char buf[256];
+        int dir;
+
+        dir = igt_debugfs_pipe_dir(drm_fd, pipe, O_DIRECTORY);
+        igt_require_fd(dir);
+        igt_debugfs_simple_read(dir, "i915_darkscreen_status", buf, sizeof(buf));
+        close(dir);
+        if (*buf == '\0')
+                return false;
+
+        return strcasestr(buf, "0") || strcasestr(buf, "1");
+}
+
+ssize_t igt_enable_dark_screen_detection(int drm_fd, enum pipe pipe)
+{
+        char buf[2];
+        int dir;
+	int enable_dark_screen_detection;
+
+	enable_dark_screen_detection = 1;
+        snprintf(buf, sizeof(buf), "%d", enable_dark_screen_detection);
+        dir = igt_debugfs_pipe_dir(drm_fd, pipe, O_DIRECTORY);
+        igt_require_fd(dir);
+        return igt_sysfs_write(dir, "i915_darkscreen_status", buf, sizeof(buf) - 1);
+}
+
+ssize_t igt_disable_dark_screen_detection(int drm_fd, enum pipe pipe)
+{
+        char buf[2];
+        int dir;
+	int disable_dark_screen_detection;
+
+	disable_dark_screen_detection = 0;
+        snprintf(buf, sizeof(buf), "%d", disable_dark_screen_detection);
+        dir = igt_debugfs_pipe_dir(drm_fd, pipe, O_DIRECTORY);
+        igt_require_fd(dir);
+        return igt_sysfs_write(dir, "i915_darkscreen_status", buf, sizeof(buf) - 1);
+}
diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h
index 3e6194ade..bd539f54d 100644
--- a/lib/igt_debugfs.h
+++ b/lib/igt_debugfs.h
@@ -77,6 +77,9 @@ void igt_hpd_storm_reset(int fd);
 bool igt_hpd_storm_detected(int fd);
 void igt_require_hpd_storm_ctl(int fd);
 bool igt_ignore_long_hpd(int fd, bool enable);
+bool igt_is_dark_screen_supported(int drm_fd, enum pipe pipe);
+ssize_t igt_enable_dark_screen_detection(int drm_fd, enum pipe pipe);
+ssize_t igt_disable_dark_screen_detection(int drm_fd, enum pipe pipe);
 
 /*
  * Drop caches
-- 
2.25.1