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drm/drm_debugfs_crc.c: Document that .verify_crc_source vfunc is required for enabling CRC support.

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drm_debugfs_crtc_crc_add() function checks that both .set_crc_source and
.verify_crc_source hooks are provided before enabling debugfs support for
reading per-frame CRC data. Make that explicit in the documentation.

Cc: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190703150330.21992-1-Liviu.Dudau@arm.com
This commit is contained in:
Liviu Dudau 2019-07-03 15:56:03 +01:00
parent 28ba1b1da4
commit 84a6810419
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/drm_debugfs_crc.c
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@ -66,9 +66,9 @@
* the reported CRCs of frames that should have the same contents.
*
* On the driver side the implementation effort is minimal, drivers only need to
* implement &drm_crtc_funcs.set_crc_source. The debugfs files are automatically
* set up if that vfunc is set. CRC samples need to be captured in the driver by
* calling drm_crtc_add_crc_entry().
* implement &drm_crtc_funcs.set_crc_source and &drm_crtc_funcs.verify_crc_source.
* The debugfs files are automatically set up if those vfuncs are set. CRC samples
* need to be captured in the driver by calling drm_crtc_add_crc_entry().
*/
static int crc_control_show(struct seq_file *m, void *data)