Re: [PATCH 15/17] drm/vc4: Convert to using __drm_atomic_helper_crtc_reset() for reset.

[Eric Anholt <eric@anholt.net>]

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Maarten Lankhorst <maarten.lankhorst@linux.intel.com> writes:

> Convert vc4 to using __drm_atomic_helper_crtc_reset(), instead of
> writing its own version. Instead of open coding destroy_state(),
> call it directly for freeing the old state.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Eric Anholt <eric@anholt.net>
> ---
>  drivers/gpu/drm/vc4/vc4_crtc.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index e7c04a9eb219..fdf21594b050 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -1041,12 +1041,13 @@ static void vc4_crtc_destroy_state(struct drm_crtc *crtc,
>  static void
>  vc4_crtc_reset(struct drm_crtc *crtc)
>  {
> -	if (crtc->state)
> -		vc4_crtc_destroy_state(crtc->state);
> +	struct vc4_crtc_state *crtc_state =
> +		kzalloc(sizeof(*crtc_state), GFP_KERNEL);
>  
> -	crtc->state = kzalloc(sizeof(struct vc4_crtc_state), GFP_KERNEL);
>  	if (crtc->state)
> -		crtc->state->crtc = crtc;
> +		vc4_crtc_destroy_state(crtc, crtc->state);
> +
> +	__drm_atomic_helper_crtc_reset(crtc, &crtc_state->base);

Wouldn't it be much easier if __drm_atomic_helper_crtc_reset took in a
new state and destroyed the old state for you?  It seems like hardly a
helper as is.

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