linux-kernel - Re: [PATCH 04/11] drm/ingenic: Move no

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Message-ID: <YLZWvFDJzZ6Ij2qy@phenom.ffwll.local>
Date:   Tue, 1 Jun 2021 17:48:12 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <mripard@...nel.org>, list@...ndingux.net,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [PATCH 04/11] drm/ingenic: Move no_vblank to private state

On Fri, May 28, 2021 at 12:20:58AM +0100, Paul Cercueil wrote:
> This information is carried from the ".atomic_check" to the
> ".atomic_commit_tail"; as such it is state-specific, and should be moved
> to the private state structure.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

Not sure this applies to your hw, but drm_crtc_state.no_vblank exists.
Might want to move to that instead of rolling your own. Or explain why you
need your own here in your own private state. It does look quite a bit
like you're just rolling your own version of this support that helpers
gained meanwhile.
-Daniel


> ---
>  drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 41 ++++++++++++++++++++---
>  1 file changed, 37 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> index e81084eb3b0e..639994329c60 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> @@ -66,6 +66,8 @@ struct jz_soc_info {
>  
>  struct ingenic_drm_private_state {
>  	struct drm_private_state base;
> +
> +	bool no_vblank;
>  };
>  
>  struct ingenic_drm {
> @@ -87,7 +89,6 @@ struct ingenic_drm {
>  	dma_addr_t dma_hwdescs_phys;
>  
>  	bool panel_is_sharp;
> -	bool no_vblank;
>  
>  	/*
>  	 * clk_mutex is used to synchronize the pixel clock rate update with
> @@ -113,6 +114,30 @@ to_ingenic_drm_priv_state(struct drm_private_state *state)
>  	return container_of(state, struct ingenic_drm_private_state, base);
>  }
>  
> +static struct ingenic_drm_private_state *
> +ingenic_drm_get_priv_state(struct ingenic_drm *priv, struct drm_atomic_state *state)
> +{
> +	struct drm_private_state *priv_state;
> +
> +	priv_state = drm_atomic_get_private_obj_state(state, &priv->private_obj);
> +	if (IS_ERR(priv_state))
> +		return ERR_CAST(priv_state);
> +
> +	return to_ingenic_drm_priv_state(priv_state);
> +}
> +
> +static struct ingenic_drm_private_state *
> +ingenic_drm_get_new_priv_state(struct ingenic_drm *priv, struct drm_atomic_state *state)
> +{
> +	struct drm_private_state *priv_state;
> +
> +	priv_state = drm_atomic_get_new_private_obj_state(state, &priv->private_obj);
> +	if (!priv_state)
> +		return NULL;
> +
> +	return to_ingenic_drm_priv_state(priv_state);
> +}
> +
>  static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg)
>  {
>  	switch (reg) {
> @@ -268,6 +293,7 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
>  									  crtc);
>  	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>  	struct drm_plane_state *f1_state, *f0_state, *ipu_state = NULL;
> +	struct ingenic_drm_private_state *priv_state;
>  
>  	if (crtc_state->gamma_lut &&
>  	    drm_color_lut_size(crtc_state->gamma_lut) != ARRAY_SIZE(priv->dma_hwdescs->palette)) {
> @@ -299,9 +325,13 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
>  			}
>  		}
>  
> +		priv_state = ingenic_drm_get_priv_state(priv, state);
> +		if (IS_ERR(priv_state))
> +			return PTR_ERR(priv_state);
> +
>  		/* If all the planes are disabled, we won't get a VBLANK IRQ */
> -		priv->no_vblank = !f1_state->fb && !f0_state->fb &&
> -				  !(ipu_state && ipu_state->fb);
> +		priv_state->no_vblank = !f1_state->fb && !f0_state->fb &&
> +					!(ipu_state && ipu_state->fb);
>  	}
>  
>  	return 0;
> @@ -727,6 +757,7 @@ static void ingenic_drm_atomic_helper_commit_tail(struct drm_atomic_state *old_s
>  	 */
>  	struct drm_device *dev = old_state->dev;
>  	struct ingenic_drm *priv = drm_device_get_priv(dev);
> +	struct ingenic_drm_private_state *priv_state;
>  
>  	drm_atomic_helper_commit_modeset_disables(dev, old_state);
>  
> @@ -736,7 +767,9 @@ static void ingenic_drm_atomic_helper_commit_tail(struct drm_atomic_state *old_s
>  
>  	drm_atomic_helper_commit_hw_done(old_state);
>  
> -	if (!priv->no_vblank)
> +	priv_state = ingenic_drm_get_new_priv_state(priv, old_state);
> +
> +	if (!priv_state || !priv_state->no_vblank)
>  		drm_atomic_helper_wait_for_vblanks(dev, old_state);
>  
>  	drm_atomic_helper_cleanup_planes(dev, old_state);
> -- 
> 2.30.2
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch