lib/igt_amd: return negative if PSR state debugfs open fails

[why & how]
The PSR state read helper should return an integer which is not
the same as PSR state enumeration item for the case of debugfs
interface opening fail. Currently it return false which is casted
to 0 that is the same as PSR_STATE0, this is incorrect.

Instead of returning 0, a negative (e.g. -1) value is returned
when debugfs interface of PSR state opening fails. And adding the
check of such negative value in amd_psr test case as well.

Cc: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Wayne Lin <wayne.lin@amd.com>

Signed-off-by: David Zhang <dingchen.zhang@amd.com>
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/igt_amd.c b/lib/igt_amd.c
index f6ca2237..bef9c193 100644
--- a/lib/igt_amd.c
+++ b/lib/igt_amd.c
@@ -1097,7 +1097,7 @@ int igt_amd_read_psr_state(int drm_fd, char *connector_name)
 	fd = igt_debugfs_connector_dir(drm_fd, connector_name, O_RDONLY);
 	if (fd < 0) {
 		igt_info("Couldn't open connector %s debugfs directory\n", connector_name);
-		return false;
+		return -1;
 	}
 
 	ret = igt_debugfs_simple_read(fd, DEBUGFS_EDP_PSR_STATE, buf, sizeof(buf));