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kms_rotation_crc: Document the two steps in prepare_crtc()

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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau 2014-07-10 17:44:28 +01:00
parent 05f3897dc1
commit 282f5605b0
1 changed files with 6 additions and 1 deletions
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7
tests/kms_rotation_crc.c
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@ -104,14 +104,19 @@ static bool prepare_crtc(data_t *data, igt_output_t *output, enum pipe pipe,
&data->fb);
igt_assert(fb_id);
/* Step 1: create a reference CRC for a software-rotated fb */
paint_squares(data, &data->fb, mode, DRM_ROTATE_180);
igt_plane_set_fb(plane, &data->fb);
igt_display_commit(display);
/* Collect reference crc */
igt_pipe_crc_collect_crc(data->pipe_crc, &data->ref_crc);
/*
* Step 2: prepare the plane with an non-rotated fb let the hw
* rotate it.
*/
paint_squares(data, &data->fb, mode, DRM_ROTATE_0);
igt_plane_set_fb(plane, &data->fb);