lib/psr: Add a macro with the maximum lenght of i915_edp_psr_status and use it

So every function reading i915_edp_psr_status can allocate a buffer
long enough.

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, 1 insertions, 1 deletions

diff --git a/tests/kms_psr.c b/tests/kms_psr.c
index d00e552f..20b69892 100644
--- a/tests/kms_psr.c
+++ b/tests/kms_psr.c
@@ -191,7 +191,7 @@ static void fill_render(data_t *data, uint32_t handle, unsigned char color)
 
 static bool sink_support(data_t *data)
 {
-	char buf[512];
+	char buf[PSR_STATUS_MAX_LEN];
 
 	igt_debugfs_simple_read(data->debugfs_fd, "i915_edp_psr_status",
 			 buf, sizeof(buf));