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lib: Add igt_pipe_crc_new_nonblock()

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Add support for reading the CRC in non-blocking mode. Useful for tests
that want to start the CRC capture, then do a bunch of operations, then
collect however many CRCs that got generated. The current
igt_pipe_crc_new() + igt_pipe_crc_get_crcs() method would block until
it gets the requested number of CRCs, whreas in non-blocking mode we
can just read as many as got generated thus far.

v2: __attribute__((warn_unused_result)), document the
    new igt_pipe_crc_get_crcs() return value (Daniel)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Ville Syrjälä
2015-12-18 14:35:05 +02:00
parent 5b113d323d
commit 9090745030
3 changed files with 101 additions and 50 deletions
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tests/kms_pipe_crc_basic.c
+3 -1
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@@ -124,6 +124,7 @@ test_read_crc_for_output(data_t *data, int pipe, igt_output_t *output,
for (c = 0; c < ARRAY_SIZE(colors); c++) {
char *crc_str;
int n_crcs;
igt_output_set_pipe(output, pipe);
igt_display_commit(display);
@@ -156,7 +157,8 @@ test_read_crc_for_output(data_t *data, int pipe, igt_output_t *output,
igt_pipe_crc_start(pipe_crc);
/* wait for N_CRCS vblanks and the corresponding N_CRCS CRCs */
igt_pipe_crc_get_crcs(pipe_crc, N_CRCS, &crcs);
n_crcs = igt_pipe_crc_get_crcs(pipe_crc, N_CRCS, &crcs);
igt_assert_eq(n_crcs, N_CRCS);
igt_pipe_crc_stop(pipe_crc);