Re: [PATCH 55/59] drm/aspeed: Use devm_drm_dev_alloc

[Sam Ravnborg <sam@ravnborg.org>]

On Wed, Apr 15, 2020 at 09:40:30AM +0200, Daniel Vetter wrote:
> As usual, we can drop the drm_dev_put() and need to embed the
> drm_device. Since it's so few, also go right ahead and leave
> drm_device->dev_private set to NULL, so that we always use the
> container_of() upcast, which is faster anyway.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Joel Stanley <joel@jms.id.au>
> Cc: Andrew Jeffery <andrew@aj.id.au>
> Cc: linux-aspeed@lists.ozlabs.org
> Cc: linux-arm-kernel@lists.infradead.org
Acked-by: Sam Ravnborg <sam@ravnborg.org>
> ---
>  drivers/gpu/drm/aspeed/aspeed_gfx.h      |  2 ++
>  drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c |  2 +-
>  drivers/gpu/drm/aspeed/aspeed_gfx_drv.c  | 31 +++++++++---------------
>  drivers/gpu/drm/aspeed/aspeed_gfx_out.c  |  2 +-
>  4 files changed, 15 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx.h b/drivers/gpu/drm/aspeed/aspeed_gfx.h
> index adc02940de6f..e7ca95827ae8 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx.h
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx.h
> @@ -5,6 +5,7 @@
>  #include <drm/drm_simple_kms_helper.h>
>  
>  struct aspeed_gfx {
> +	struct drm_device		drm;
>  	void __iomem			*base;
>  	struct clk			*clk;
>  	struct reset_control		*rst;
> @@ -13,6 +14,7 @@ struct aspeed_gfx {
>  	struct drm_simple_display_pipe	pipe;
>  	struct drm_connector		connector;
>  };
> +#define to_aspeed_gfx(x) container_of(x, struct aspeed_gfx, drm)
>  
>  int aspeed_gfx_create_pipe(struct drm_device *drm);
>  int aspeed_gfx_create_output(struct drm_device *drm);
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
> index 2184b8be6fd4..e54686c31a90 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
> @@ -231,7 +231,7 @@ static const uint32_t aspeed_gfx_formats[] = {
>  
>  int aspeed_gfx_create_pipe(struct drm_device *drm)
>  {
> -	struct aspeed_gfx *priv = drm->dev_private;
> +	struct aspeed_gfx *priv = to_aspeed_gfx(drm);
>  
>  	return drm_simple_display_pipe_init(drm, &priv->pipe, &aspeed_gfx_funcs,
>  					    aspeed_gfx_formats,
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> index ada2f6aca906..6b27242b9ee3 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> @@ -77,7 +77,7 @@ static void aspeed_gfx_setup_mode_config(struct drm_device *drm)
>  static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
>  {
>  	struct drm_device *drm = data;
> -	struct aspeed_gfx *priv = drm->dev_private;
> +	struct aspeed_gfx *priv = to_aspeed_gfx(drm);
>  	u32 reg;
>  
>  	reg = readl(priv->base + CRT_CTRL1);
> @@ -96,15 +96,10 @@ static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
>  static int aspeed_gfx_load(struct drm_device *drm)
>  {
>  	struct platform_device *pdev = to_platform_device(drm->dev);
> -	struct aspeed_gfx *priv;
> +	struct aspeed_gfx *priv = to_aspeed_gfx(drm);
>  	struct resource *res;
>  	int ret;
>  
> -	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> -	if (!priv)
> -		return -ENOMEM;
> -	drm->dev_private = priv;
> -
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	priv->base = devm_ioremap_resource(drm->dev, res);
>  	if (IS_ERR(priv->base))
> @@ -187,8 +182,6 @@ static void aspeed_gfx_unload(struct drm_device *drm)
>  {
>  	drm_kms_helper_poll_fini(drm);
>  	drm_mode_config_cleanup(drm);
> -
> -	drm->dev_private = NULL;
>  }
>  
>  DEFINE_DRM_GEM_CMA_FOPS(fops);
> @@ -216,27 +209,26 @@ static const struct of_device_id aspeed_gfx_match[] = {
>  
>  static int aspeed_gfx_probe(struct platform_device *pdev)
>  {
> -	struct drm_device *drm;
> +	struct aspeed_gfx *priv;
>  	int ret;
>  
> -	drm = drm_dev_alloc(&aspeed_gfx_driver, &pdev->dev);
> -	if (IS_ERR(drm))
> -		return PTR_ERR(drm);
> +	priv = devm_drm_dev_alloc(&pdev->dev, &aspeed_gfx_driver,
> +				  struct aspeed_gfx, drm);
> +	if (IS_ERR(priv))
> +		return PTR_ERR(priv);
>  
> -	ret = aspeed_gfx_load(drm);
> +	ret = aspeed_gfx_load(&priv->drm);
>  	if (ret)
> -		goto err_free;
> +		return ret;
>  
> -	ret = drm_dev_register(drm, 0);
> +	ret = drm_dev_register(&priv->drm, 0);
>  	if (ret)
>  		goto err_unload;
>  
>  	return 0;
>  
>  err_unload:
> -	aspeed_gfx_unload(drm);
> -err_free:
> -	drm_dev_put(drm);
> +	aspeed_gfx_unload(&priv->drm);
>  
>  	return ret;
>  }
> @@ -247,7 +239,6 @@ static int aspeed_gfx_remove(struct platform_device *pdev)
>  
>  	drm_dev_unregister(drm);
>  	aspeed_gfx_unload(drm);
> -	drm_dev_put(drm);
>  
>  	return 0;
>  }
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_out.c b/drivers/gpu/drm/aspeed/aspeed_gfx_out.c
> index 67ee5fa10055..6759cb88415a 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_out.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_out.c
> @@ -28,7 +28,7 @@ static const struct drm_connector_funcs aspeed_gfx_connector_funcs = {
>  
>  int aspeed_gfx_create_output(struct drm_device *drm)
>  {
> -	struct aspeed_gfx *priv = drm->dev_private;
> +	struct aspeed_gfx *priv = to_aspeed_gfx(drm);
>  	int ret;
>  
>  	priv->connector.dpms = DRM_MODE_DPMS_OFF;
> -- 
> 2.25.1
> 
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