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drm: Validate encoder->possible_crtcs

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WARN if the encoder possible_crtcs is effectively empty or contains
bits for non-existing crtcs.

v2: Move to drm_mode_config_validate() (Daniel)
    Make the docs say we WARN when this is wrong (Daniel)
    Extract full_crtc_mask()

Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211162208.16224-7-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä
2020-03-18 18:38:27 +02:00
parent 74d2aacbe8
commit 0df1082374
2 changed files with 27 additions and 2 deletions
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include/drm/drm_encoder.h
+1 -1
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@@ -142,7 +142,7 @@ struct drm_encoder {
* the bits for all &drm_crtc objects this encoder can be connected to
* before calling drm_dev_register().
*
* In reality almost every driver gets this wrong.
* You will get a WARN if you get this wrong in the driver.
*
* Note that since CRTC objects can't be hotplugged the assigned indices
* are stable and hence known before registering all objects.