Re: [PATCH 17/21] drm: Unexport drm_plane_helper_check_update

[Sam Ravnborg <sam@ravnborg.org>]

On Thu, Oct 04, 2018 at 10:24:42PM +0200, Daniel Vetter wrote:
> It's for legacy drivers only (atomic ones should use
> drm_atomic_helper_check_plane_state() instead), and there's no users
> left except the one in the primary plane helpers.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/drm_plane_helper.c | 49 +++++++-----------------------
>  include/drm/drm_plane_helper.h     | 11 -------
>  2 files changed, 11 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
> index 965286231600..33b3e6892787 100644
> --- a/drivers/gpu/drm/drm_plane_helper.c
> +++ b/drivers/gpu/drm/drm_plane_helper.c
> @@ -100,43 +100,17 @@ static int get_connectors_for_crtc(struct drm_crtc *crtc,
>  	return count;
>  }
>  
> -/**
> - * drm_plane_helper_check_update() - Check plane update for validity
> - * @plane: plane object to update
> - * @crtc: owning CRTC of owning plane
> - * @fb: framebuffer to flip onto plane
> - * @src: source coordinates in 16.16 fixed point
> - * @dst: integer destination coordinates
> - * @rotation: plane rotation
> - * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
> - * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
> - * @can_position: is it legal to position the plane such that it
> - *                doesn't cover the entire crtc?  This will generally
> - *                only be false for primary planes.
> - * @can_update_disabled: can the plane be updated while the crtc
> - *                       is disabled?
> - * @visible: output parameter indicating whether plane is still visible after
> - *           clipping
> - *
> - * Checks that a desired plane update is valid.  Drivers that provide
> - * their own plane handling rather than helper-provided implementations may
> - * still wish to call this function to avoid duplication of error checking
> - * code.
> - *
> - * RETURNS:
> - * Zero if update appears valid, error code on failure
> - */
> -int drm_plane_helper_check_update(struct drm_plane *plane,
> -				  struct drm_crtc *crtc,
> -				  struct drm_framebuffer *fb,
> -				  struct drm_rect *src,
> -				  struct drm_rect *dst,
> -				  unsigned int rotation,
> -				  int min_scale,
> -				  int max_scale,
> -				  bool can_position,
> -				  bool can_update_disabled,
> -				  bool *visible)
> +static int drm_plane_helper_check_update(struct drm_plane *plane,

This patch makes the function static, which does not render the comment useless.
It would make sense to keep the comment around, but maybe in a more dense
format without all paramters explained.

Maybe just a simple:
/*
 * Checks that a desired plane update is valid.
 * Returns 0 if update appears valid, error code on failure
 */

	Sam
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