[igt-dev] [PATCH i-g-t 1/3] igt/kms_fbcon_fbt: Handle ENODEV when checking i915_edp_psr_status for chipset support

[Marta Lofstedt]

If the machine doesn't support PSR, it will return -ENODEV from
i915_edp_psr_status, which we want to interpret as unsupported.
This is in line with what Chris just fixed for FBC.

Signed-off-by: Marta Lofstedt <marta.lofstedt at intel.com>
---
 tests/kms_fbcon_fbt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/kms_fbcon_fbt.c b/tests/kms_fbcon_fbt.c
index 1b236f8b..6aa171e6 100644
--- a/tests/kms_fbcon_fbt.c
+++ b/tests/kms_fbcon_fbt.c
@@ -164,6 +164,8 @@ static bool psr_supported_on_chipset(int fd)
 {
 	char buf[256];
 
+	if (*buf == '\0') /* !HAS_PSR -> -ENODEV*/
+		return false;
 	igt_debugfs_read(fd, "i915_edp_psr_status", buf);
 	return strstr(buf, "Sink_Support: yes\n");
 }
-- 
2.11.0