lib: add igt_pipe_crc_check

No need to duplicate this all over the place.

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 19 insertions, 0 deletions

diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index 1ceaf59d..139be893 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -205,6 +205,24 @@ static void pipe_crc_exit_handler(int sig)
 	igt_pipe_crc_reset();
 }
 
+void igt_pipe_crc_check(igt_debugfs_t *debugfs)
+{
+	const char *cmd = "pipe A none";
+	FILE *ctl;
+	size_t written;
+	int ret;
+
+	ctl = igt_debugfs_fopen(debugfs, "i915_display_crc_ctl", "r+");
+	igt_require_f(ctl,
+		      "No display_crc_ctl found, kernel too old\n");
+	written = fwrite(cmd, 1, strlen(cmd), ctl);
+	ret = fflush(ctl);
+	igt_require_f((written == strlen(cmd) && ret == 0) || errno != ENODEV,
+		      "CRCs not supported on this platform\n");
+
+	fclose(ctl);
+}
+
 igt_pipe_crc_t *
 igt_pipe_crc_new(igt_debugfs_t *debugfs, int drm_fd, enum pipe pipe,
 		 enum intel_pipe_crc_source source)
diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h
index 40d9d28f..393b5767 100644
--- a/lib/igt_debugfs.h
+++ b/lib/igt_debugfs.h
@@ -70,6 +70,7 @@ bool igt_crc_is_null(igt_crc_t *crc);
 bool igt_crc_equal(igt_crc_t *a, igt_crc_t *b);
 char *igt_crc_to_string(igt_crc_t *crc);
 
+void igt_pipe_crc_check(igt_debugfs_t *debugfs);
 igt_pipe_crc_t *
 igt_pipe_crc_new(igt_debugfs_t *debugfs, int drm_fd, enum pipe pipe,
 		 enum intel_pipe_crc_source source);