lib/igt_debugfs: Add igt_pipe_crc_get_single and igt_pipe_crc_drain, v4.

Collecting CRC may result in a modeset and extra vblank waits. On some
tests this will increase the runtime a lot, so it makes sense to
keep it enabled, and only collect the most recent CRC when needed.

Changes since v1:
- Fix read_crc semantics. (Ville)
Changes since v2:
- Remove EAGAIN assert, can be reached from drain_crc.
Changes since v3:
- Do not infinitely loop in igt_pipe_crc_drain().

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com> #v2
Tested-by: Vidya Srinivas <vidya.srinivas@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h
index d90dd7a6..8d25abfe 100644
--- a/lib/igt_debugfs.h
+++ b/lib/igt_debugfs.h
@@ -130,6 +130,8 @@ void igt_pipe_crc_stop(igt_pipe_crc_t *pipe_crc);
 __attribute__((warn_unused_result))
 int igt_pipe_crc_get_crcs(igt_pipe_crc_t *pipe_crc, int n_crcs,
 			  igt_crc_t **out_crcs);
+void igt_pipe_crc_drain(igt_pipe_crc_t *pipe_crc);
+bool igt_pipe_crc_get_single(igt_pipe_crc_t *pipe_crc, igt_crc_t *out_crc);
 void igt_pipe_crc_collect_crc(igt_pipe_crc_t *pipe_crc, igt_crc_t *out_crc);
 
 void igt_hpd_storm_set_threshold(int fd, unsigned int threshold);