tests/psr: Share the code check if sink supports PSR

The same code checking if sink supports PSR was spread into 3 tests,
better move it to lib and reuse.

v2: splitted previous patch into this one and the next one(Dhinakaran)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/igt_psr.c b/lib/igt_psr.c
index c105bb6e..82012e6d 100644
--- a/lib/igt_psr.c
+++ b/lib/igt_psr.c
@@ -129,3 +129,13 @@ bool psr_disable(int debugfs_fd)
 {
 	return psr_set(debugfs_fd, false);
 }
+
+bool psr_sink_support(int debugfs_fd)
+{
+	char buf[PSR_STATUS_MAX_LEN];
+	int ret;
+
+	ret = igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
+				      sizeof(buf));
+	return ret > 0 && strstr(buf, "Sink_Support: yes\n");
+}