Platforms do not support psr and drrs simultaneously.
Adding a subtest to make the check.

Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
Signed-off-by: Radhakrishna Sripada <radhakrishna.srip...@intel.com>
---
 tests/kms_psr_sink_crc.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/kms_psr_sink_crc.c b/tests/kms_psr_sink_crc.c
index bd3fa5e94d85..1c25f2c81a34 100644
--- a/tests/kms_psr_sink_crc.c
+++ b/tests/kms_psr_sink_crc.c
@@ -284,6 +284,15 @@ static void assert_or_manual(bool condition, const char 
*expected)
        igt_assert(igt_interactive_debug || condition);
 }
 
+static bool drrs_disabled(data_t *data)
+{
+       char buf[512];
+
+       igt_debugfs_read(data->drm_fd, "i915_drrs_status", buf);
+
+       return strstr(buf, "DRRS Support: No\n");
+}
+
 static void run_test(data_t *data)
 {
        uint32_t handle = data->fb_white.gem_handle;
@@ -524,6 +533,11 @@ int main(int argc, char *argv[])
                igt_assert(wait_psr_entry(&data));
        }
 
+       igt_subtest("psr_drrs") {
+               setup_test_plane(&data);
+               igt_assert(drrs_disabled(&data));
+       }
+
        for (op = PAGE_FLIP; op <= RENDER; op++) {
                igt_subtest_f("primary_%s", op_str(op)) {
                        data.test_plane = DRM_PLANE_TYPE_PRIMARY;
-- 
2.9.3

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