[PATCH 03/20] drm/fsl-dcu: Use drm_fbdev_generic_setup()

[Stefan Agner]

On 08.09.2018 15:46, Noralf Trønnes wrote:
> The CMA helper is already using the drm_fb_helper_generic_probe part of
> the generic fbdev emulation. This patch makes full use of the generic
> fbdev emulation by using its drm_client callbacks. This means that
> drm_mode_config_funcs->output_poll_changed and drm_driver->lastclose are
> now handled by the emulation code. Additionally fbdev unregister happens
> automatically on drm_dev_unregister().
> 
> The drm_fbdev_generic_setup() call is put after drm_dev_register() in the
> driver. This is done to highlight the fact that fbdev emulation is an
> internal client that makes use of the driver, it is not part of the
> driver as such. If fbdev setup fails, an error is printed, but the driver
> succeeds probing.

I think the last sentence is currently not implemented, I think it will
silently succeed probing. Can we add something like this, similar to
tinydrm-core.c?

	if (ret)
		DRM_ERROR("Failed to initialize fbdev: %d\n", ret);

--
Stefan

> 
> Cc: Stefan Agner <stefan at agner.ch>
> Cc: Alison Wang <alison.wang at nxp.com>
> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 25 +++----------------------
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h |  1 -
>  2 files changed, 3 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> index 80232321a244..15816141e5fb 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -26,6 +26,7 @@
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_fb_helper.h>
>  #include <drm/drm_gem_cma_helper.h>
>  #include <drm/drm_modeset_helper.h>
>  
> @@ -89,20 +90,11 @@ static int fsl_dcu_load(struct drm_device *dev,
> unsigned long flags)
>  			"Invalid legacyfb_depth.  Defaulting to 24bpp\n");
>  		legacyfb_depth = 24;
>  	}
> -	fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1);
> -	if (IS_ERR(fsl_dev->fbdev)) {
> -		ret = PTR_ERR(fsl_dev->fbdev);
> -		fsl_dev->fbdev = NULL;
> -		goto done;
> -	}
>  
>  	return 0;
>  done:
>  	drm_kms_helper_poll_fini(dev);
>  
> -	if (fsl_dev->fbdev)
> -		drm_fbdev_cma_fini(fsl_dev->fbdev);
> -
>  	drm_mode_config_cleanup(dev);
>  	drm_irq_uninstall(dev);
>  	dev->dev_private = NULL;
> @@ -112,14 +104,9 @@ static int fsl_dcu_load(struct drm_device *dev,
> unsigned long flags)
>  
>  static void fsl_dcu_unload(struct drm_device *dev)
>  {
> -	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
> -
>  	drm_atomic_helper_shutdown(dev);
>  	drm_kms_helper_poll_fini(dev);
>  
> -	if (fsl_dev->fbdev)
> -		drm_fbdev_cma_fini(fsl_dev->fbdev);
> -
>  	drm_mode_config_cleanup(dev);
>  	drm_irq_uninstall(dev);
>  
> @@ -147,19 +134,11 @@ static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
>  	return IRQ_HANDLED;
>  }
>  
> -static void fsl_dcu_drm_lastclose(struct drm_device *dev)
> -{
> -	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
> -
> -	drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
> -}
> -
>  DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
>  
>  static struct drm_driver fsl_dcu_drm_driver = {
>  	.driver_features	= DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
>  				| DRIVER_PRIME | DRIVER_ATOMIC,
> -	.lastclose		= fsl_dcu_drm_lastclose,
>  	.load			= fsl_dcu_load,
>  	.unload			= fsl_dcu_unload,
>  	.irq_handler		= fsl_dcu_drm_irq,
> @@ -355,6 +334,8 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
>  	if (ret < 0)
>  		goto unref;
>  
> +	drm_fbdev_generic_setup(drm, legacyfb_depth);
> +
>  	return 0;
>  
>  unref:
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
> index 93bfb98012d4..cb87bb74cb87 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
> @@ -191,7 +191,6 @@ struct fsl_dcu_drm_device {
>  	/*protects hardware register*/
>  	spinlock_t irq_lock;
>  	struct drm_device *drm;
> -	struct drm_fbdev_cma *fbdev;
>  	struct drm_crtc crtc;
>  	struct drm_encoder encoder;
>  	struct fsl_dcu_drm_connector connector;