Re: [PATCH v3 3/5] drm/rcar-du: Use drm_fbdev_generic_setup()

[Noralf Trønnes <noralf@xxxxxxxxxxx>]

Den 28.11.2018 22.27, skrev Noralf Trønnes:
> 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.
>
> drm_fbdev_generic_setup() handles mode_config.num_connector being zero.
> In that case it retries fbdev setup on the next .output_poll_changed.
>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
> Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---


Applied to drm-misc-next.


Noralf.


>   drivers/gpu/drm/rcar-du/rcar_du_drv.c | 14 +++-----------
>   drivers/gpu/drm/rcar-du/rcar_du_drv.h |  2 --
>   drivers/gpu/drm/rcar-du/rcar_du_kms.c | 21 ---------------------
>   3 files changed, 3 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> index c6770043dcdc..c24aabe3e3e9 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> @@ -21,6 +21,7 @@
>   #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 "rcar_du_drv.h"
> @@ -363,19 +364,11 @@ MODULE_DEVICE_TABLE(of, rcar_du_of_table);
>    * DRM operations
>    */
>   
> -static void rcar_du_lastclose(struct drm_device *dev)
> -{
> -	struct rcar_du_device *rcdu = dev->dev_private;
> -
> -	drm_fbdev_cma_restore_mode(rcdu->fbdev);
> -}
> -
>   DEFINE_DRM_GEM_CMA_FOPS(rcar_du_fops);
>   
>   static struct drm_driver rcar_du_driver = {
>   	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME
>   				| DRIVER_ATOMIC,
> -	.lastclose		= rcar_du_lastclose,
>   	.gem_free_object_unlocked = drm_gem_cma_free_object,
>   	.gem_vm_ops		= &drm_gem_cma_vm_ops,
>   	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
> @@ -431,9 +424,6 @@ static int rcar_du_remove(struct platform_device *pdev)
>   
>   	drm_dev_unregister(ddev);
>   
> -	if (rcdu->fbdev)
> -		drm_fbdev_cma_fini(rcdu->fbdev);
> -
>   	drm_kms_helper_poll_fini(ddev);
>   	drm_mode_config_cleanup(ddev);
>   
> @@ -493,6 +483,8 @@ static int rcar_du_probe(struct platform_device *pdev)
>   
>   	DRM_INFO("Device %s probed\n", dev_name(&pdev->dev));
>   
> +	drm_fbdev_generic_setup(ddev, 32);
> +
>   	return 0;
>   
>   error:
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> index 9f5563296c5a..a68da79b424e 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> @@ -20,7 +20,6 @@
>   struct clk;
>   struct device;
>   struct drm_device;
> -struct drm_fbdev_cma;
>   struct rcar_du_device;
>   
>   #define RCAR_DU_FEATURE_CRTC_IRQ_CLOCK	BIT(0)	/* Per-CRTC IRQ and clock */
> @@ -78,7 +77,6 @@ struct rcar_du_device {
>   	void __iomem *mmio;
>   
>   	struct drm_device *ddev;
> -	struct drm_fbdev_cma *fbdev;
>   
>   	struct rcar_du_crtc crtcs[RCAR_DU_MAX_CRTCS];
>   	unsigned int num_crtcs;
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> index 4ebd61ecbee1..6562871aa706 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> @@ -255,13 +255,6 @@ rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
>   	return drm_gem_fb_create(dev, file_priv, mode_cmd);
>   }
>   
> -static void rcar_du_output_poll_changed(struct drm_device *dev)
> -{
> -	struct rcar_du_device *rcdu = dev->dev_private;
> -
> -	drm_fbdev_cma_hotplug_event(rcdu->fbdev);
> -}
> -
>   /* -----------------------------------------------------------------------------
>    * Atomic Check and Update
>    */
> @@ -308,7 +301,6 @@ static const struct drm_mode_config_helper_funcs rcar_du_mode_config_helper = {
>   
>   static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
>   	.fb_create = rcar_du_fb_create,
> -	.output_poll_changed = rcar_du_output_poll_changed,
>   	.atomic_check = rcar_du_atomic_check,
>   	.atomic_commit = drm_atomic_helper_commit,
>   };
> @@ -543,7 +535,6 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
>   
>   	struct drm_device *dev = rcdu->ddev;
>   	struct drm_encoder *encoder;
> -	struct drm_fbdev_cma *fbdev;
>   	unsigned int dpad0_sources;
>   	unsigned int num_encoders;
>   	unsigned int num_groups;
> @@ -682,17 +673,5 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
>   
>   	drm_kms_helper_poll_init(dev);
>   
> -	if (dev->mode_config.num_connector) {
> -		fbdev = drm_fbdev_cma_init(dev, 32,
> -					   dev->mode_config.num_connector);
> -		if (IS_ERR(fbdev))
> -			return PTR_ERR(fbdev);
> -
> -		rcdu->fbdev = fbdev;
> -	} else {
> -		dev_info(rcdu->dev,
> -			 "no connector found, disabling fbdev emulation\n");
> -	}
> -
>   	return 0;
>   }
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