[igt-dev] [PATCH] [i-g-t] tests/amdgpu/amd_bypass: Skip test when DP Rx output bpc < 8 bpc

[Hersen Wu]

Check DP or eDP Rx output bpc, skip test when output bpc is
less than 8bpc.

This test compares CRC of CRTC and Rx. It needs both CRTC_CRC
and Rx-CRC with 8bpc. If CRTC-CRC with 8bpc, but Rx-CRC with
6bpc, then their values  will not match.

Signed-off-by: Hersen Wu <hersenxs.wu at amd.com>
---
 tests/amdgpu/amd_bypass.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/amdgpu/amd_bypass.c b/tests/amdgpu/amd_bypass.c
index d191779b0..d192a30ea 100644
--- a/tests/amdgpu/amd_bypass.c
+++ b/tests/amdgpu/amd_bypass.c
@@ -331,6 +331,13 @@ static void bypass_8bpc_test(data_t *data)
 	igt_skip_on_f(igt_amd_read_dsc_clock_status(data->drm_fd, data->output->name) == 1,
 		      "DSC enabled on %s and no sense to validate bypass mode\n", data->output->name);
 
+	/* 8bpc bypass only valid when DP or eDP Rx supports 8bpc or up. When
+	 * Rx supports only up to 6bpc, Rx-crc will different from crtc-crc
+	 * with 8bpc.
+	 */
+	igt_skip_on_f(igt_get_output_max_bpc(data->drm_fd, data->output->name) <= 6,
+		      "check /sys/kernel/debug/dri/0/eDP-1 (connector)/output_bpc\n");
+
 	igt_create_fb(data->drm_fd, data->width, data->height,
 		      DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_LINEAR, &fb);
 
-- 
2.25.1