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drm: simple_kms_helper: Fix .mode_valid() documentation

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This fixes up the .mode_valid() vtable entry documentation
by copyediting the documentation from the .mode_valid()
documentation in the drm_modeset_helper_vtables.h file.

Fixes: 40275dc4ed ("drm: simple_kms_helper: Add mode_valid() callback support")
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180227101109.6088-1-linus.walleij@linaro.org
This commit is contained in:
Linus Walleij 2018-02-27 11:11:09 +01:00
parent bbce9ad9c2
commit afe09e43b4
1 changed files with 24 additions and 3 deletions
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27
include/drm/drm_simple_kms_helper.h
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@ -24,9 +24,30 @@ struct drm_simple_display_pipe_funcs {
/**
* @mode_valid:
*
* This function is called to filter out valid modes from the
* suggestions suggested by the bridge or display. This optional
* hook is passed in when initializing the pipeline.
* This callback is used to check if a specific mode is valid in the
* crtc used in this simple display pipe. This should be implemented
* if the display pipe has some sort of restriction in the modes
* it can display. For example, a given display pipe may be responsible
* to set a clock value. If the clock can not produce all the values
* for the available modes then this callback can be used to restrict
* the number of modes to only the ones that can be displayed. Another
* reason can be bandwidth mitigation: the memory port on the display
* controller can have bandwidth limitations not allowing pixel data
* to be fetched at any rate.
*
* This hook is used by the probe helpers to filter the mode list in
* drm_helper_probe_single_connector_modes(), and it is used by the
* atomic helpers to validate modes supplied by userspace in
* drm_atomic_helper_check_modeset().
*
* This function is optional.
*
* NOTE:
*
* Since this function is both called from the check phase of an atomic
* commit, and the mode validation in the probe paths it is not allowed
* to look at anything else but the passed-in mode, and validate it
* against configuration-invariant hardware constraints.
*
* RETURNS:
*