Re: [PATCH 2/3] drm/fb-helper: Rename preferred_bpp drm_fbdev_generic_setup() parameter

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Javier,

Thank you for the patch.

On Mon, May 02, 2022 at 10:48:29AM +0200, Javier Martinez Canillas wrote:
> By default the bits per pixel for the emulated framebuffer device is set
> to dev->mode_config.preferred_depth, but some devices need another value.
> 
> Since this second parameter is only used by a few drivers, and to allow
> drivers to use it for passing other configurations when registering the
> fbdev, rename @preferred_bpp to @options and make it a multi-field param.
> 
> The DRM_FB_SET_OPTION() and DRM_FB_GET_OPTION() macros are provided for
> drivers to set and get an option respectively. For now, only DRM_FB_BPP
> option exists but other options would be added later.
> 
> Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
> ---
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c         |  6 ++++--
>  drivers/gpu/drm/arm/hdlcd_drv.c                 |  2 +-
>  drivers/gpu/drm/arm/malidp_drv.c                |  2 +-
>  drivers/gpu/drm/aspeed/aspeed_gfx_drv.c         |  2 +-
>  drivers/gpu/drm/ast/ast_drv.c                   |  2 +-
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c    |  2 +-
>  drivers/gpu/drm/drm_drv.c                       |  2 +-
>  drivers/gpu/drm/drm_fb_helper.c                 | 16 ++++++++++++----
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c       |  2 +-
>  drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c |  2 +-
>  drivers/gpu/drm/imx/dcss/dcss-kms.c             |  2 +-
>  drivers/gpu/drm/imx/imx-drm-core.c              |  2 +-
>  drivers/gpu/drm/ingenic/ingenic-drm-drv.c       |  2 +-
>  drivers/gpu/drm/mcde/mcde_drv.c                 |  2 +-
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c          |  2 +-
>  drivers/gpu/drm/meson/meson_drv.c               |  2 +-
>  drivers/gpu/drm/mxsfb/mxsfb_drv.c               |  2 +-
>  drivers/gpu/drm/pl111/pl111_drv.c               |  2 +-
>  drivers/gpu/drm/qxl/qxl_drv.c                   |  2 +-
>  drivers/gpu/drm/rcar-du/rcar_du_drv.c           |  2 +-
>  drivers/gpu/drm/sti/sti_drv.c                   |  2 +-
>  drivers/gpu/drm/stm/drv.c                       |  2 +-
>  drivers/gpu/drm/sun4i/sun4i_drv.c               |  2 +-
>  drivers/gpu/drm/tidss/tidss_drv.c               |  2 +-
>  drivers/gpu/drm/tilcdc/tilcdc_drv.c             |  2 +-
>  drivers/gpu/drm/tiny/arcpgu.c                   |  2 +-
>  drivers/gpu/drm/tiny/bochs.c                    |  2 +-
>  drivers/gpu/drm/tve200/tve200_drv.c             |  2 +-
>  drivers/gpu/drm/vboxvideo/vbox_drv.c            |  2 +-
>  drivers/gpu/drm/vc4/vc4_drv.c                   |  2 +-
>  drivers/gpu/drm/virtio/virtgpu_drv.c            |  2 +-
>  drivers/gpu/drm/xlnx/zynqmp_dpsub.c             |  2 +-
>  include/drm/drm_fb_helper.h                     | 12 ++++++++++++
>  33 files changed, 58 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index b03663f42cc9..f5fae3838cdc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -2118,9 +2118,11 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
>  	    !list_empty(&adev_to_drm(adev)->mode_config.connector_list)) {
>  		/* select 8 bpp console on low vram cards */
>  		if (adev->gmc.real_vram_size <= (32*1024*1024))
> -			drm_fbdev_generic_setup(adev_to_drm(adev), 8);
> +			drm_fbdev_generic_setup(adev_to_drm(adev),
> +						DRM_FB_SET_OPTION(DRM_FB_BPP, 8));
>  		else
> -			drm_fbdev_generic_setup(adev_to_drm(adev), 32);
> +			drm_fbdev_generic_setup(adev_to_drm(adev),
> +						DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  	}
>  
>  	ret = amdgpu_debugfs_init(adev);
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index e89ae0ec60eb..636b0e989398 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -321,7 +321,7 @@ static int hdlcd_drm_bind(struct device *dev)
>  	if (ret)
>  		goto err_register;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index d5aef21426cf..8f7c4f3136d5 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -863,7 +863,7 @@ static int malidp_bind(struct device *dev)
>  	if (ret)
>  		goto register_fail;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> index 7780b72de9e8..c16837fd1f8d 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> @@ -343,7 +343,7 @@ static int aspeed_gfx_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_unload;
>  
> -	drm_fbdev_generic_setup(&priv->drm, 32);
> +	drm_fbdev_generic_setup(&priv->drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  	return 0;
>  
>  err_unload:
> diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
> index 7465c4f0156a..813e9af00983 100644
> --- a/drivers/gpu/drm/ast/ast_drv.c
> +++ b/drivers/gpu/drm/ast/ast_drv.c
> @@ -126,7 +126,7 @@ static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	if (ret)
>  		return ret;
>  
> -	drm_fbdev_generic_setup(dev, 32);
> +	drm_fbdev_generic_setup(dev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  }
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index 651e3c109360..e18dcd16ff8a 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -760,7 +760,7 @@ static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_unload;
>  
> -	drm_fbdev_generic_setup(ddev, 24);
> +	drm_fbdev_generic_setup(ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, 24));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 8214a0b1ab7f..6695937945a5 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -324,7 +324,7 @@ void drm_minor_release(struct drm_minor *minor)
>   *		if (ret)
>   *			return ret;
>   *
> - *		drm_fbdev_generic_setup(drm, 32);
> + *		drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>   *
>   *		return 0;
>   *	}
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index d265a73313c9..f626947bb9b9 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2501,8 +2501,16 @@ static const struct drm_client_funcs drm_fbdev_client_funcs = {
>  /**
>   * drm_fbdev_generic_setup() - Setup generic fbdev emulation
>   * @dev: DRM device
> - * @preferred_bpp: Preferred bits per pixel for the device.
> - *                 @dev->mode_config.preferred_depth is used if this is zero.
> + * @options: options for the registered framebuffer.
> + *
> + * The @options parameter is a multi-field parameter that can contain
> + * different options for the emulated framebuffer device registered.
> + *
> + * The options must be set using DRM_FB_SET_OPTION() and obtained using
> + * DRM_FB_GET_OPTION(). The options field are the following:
> + *
> + * * DRM_FB_BPP: bits per pixel for the device. If the field is not set,
> + *               @dev->mode_config.preferred_depth is used instead.

Do I assume correctly that a driver that would need to set multiple
options would do something like

	drm_fbdev_generic_setup(dev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32) |
				DRM_FB_SET_OPTION(DRM_FB_FW, 1));

? If so, I would rename DRM_FB_SET_OPTION() to DRM_FB_OPTION() as it's
computing the value of the option bitfield, it doesn't actually set it.
Apart from that,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

>   *
>   * This function sets up generic fbdev emulation for drivers that supports
>   * dumb buffers with a virtual address and that can be mmap'ed.
> @@ -2525,10 +2533,10 @@ static const struct drm_client_funcs drm_fbdev_client_funcs = {
>   *
>   * The fbdev is destroyed by drm_dev_unregister().
>   */
> -void drm_fbdev_generic_setup(struct drm_device *dev,
> -			     unsigned int preferred_bpp)
> +void drm_fbdev_generic_setup(struct drm_device *dev, unsigned int options)
>  {
>  	struct drm_fb_helper *fb_helper;
> +	unsigned int preferred_bpp = DRM_FB_GET_OPTION(DRM_FB_BPP, options);
>  	int ret;
>  
>  	drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
> 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 7a503bf08d0f..7bd8129388f2 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -334,7 +334,7 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
>  	if (ret < 0)
>  		goto put;
>  
> -	drm_fbdev_generic_setup(drm, legacyfb_depth);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, legacyfb_depth));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> index 2af51df6dca7..90aa59b77d31 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> @@ -237,7 +237,7 @@ static int kirin_drm_bind(struct device *dev)
>  	if (ret)
>  		goto err_kms_cleanup;
>  
> -	drm_fbdev_generic_setup(drm_dev, 32);
> +	drm_fbdev_generic_setup(drm_dev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-kms.c b/drivers/gpu/drm/imx/dcss/dcss-kms.c
> index 9b84df34a6a1..a4736ae85881 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-kms.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-kms.c
> @@ -148,7 +148,7 @@ struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
>  	if (ret)
>  		goto cleanup_crtc;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return kms;
>  
> diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
> index a57812ec36b1..4151f9b1b645 100644
> --- a/drivers/gpu/drm/imx/imx-drm-core.c
> +++ b/drivers/gpu/drm/imx/imx-drm-core.c
> @@ -251,7 +251,7 @@ static int imx_drm_bind(struct device *dev)
>  	if (ret)
>  		goto err_poll_fini;
>  
> -	drm_fbdev_generic_setup(drm, legacyfb_depth);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, legacyfb_depth));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> index 8eb0ad501a7b..9726c901677c 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> @@ -1388,7 +1388,7 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
>  		goto err_clk_notifier_unregister;
>  	}
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
> index e601baa87e55..1382a818c66b 100644
> --- a/drivers/gpu/drm/mcde/mcde_drv.c
> +++ b/drivers/gpu/drm/mcde/mcde_drv.c
> @@ -238,7 +238,7 @@ static int mcde_drm_bind(struct device *dev)
>  	if (ret < 0)
>  		goto unbind;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 247c6ff277ef..146f3f064e3e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -393,7 +393,7 @@ static int mtk_drm_bind(struct device *dev)
>  	if (ret < 0)
>  		goto err_deinit;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
> index 1b70938cfd2c..76463b940349 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -350,7 +350,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
>  	if (ret)
>  		goto uninstall_irq;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index 9d71c55a31c0..5e4c8e15eca7 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -357,7 +357,7 @@ static int mxsfb_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_unload;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
> index 520301b405f1..b9d1762051c8 100644
> --- a/drivers/gpu/drm/pl111/pl111_drv.c
> +++ b/drivers/gpu/drm/pl111/pl111_drv.c
> @@ -308,7 +308,7 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
>  	if (ret < 0)
>  		goto dev_put;
>  
> -	drm_fbdev_generic_setup(drm, priv->variant->fb_bpp);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, priv->variant->fb_bpp));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
> index 1cb6f0c224bb..fb7936bbdea8 100644
> --- a/drivers/gpu/drm/qxl/qxl_drv.c
> +++ b/drivers/gpu/drm/qxl/qxl_drv.c
> @@ -122,7 +122,7 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	if (ret)
>  		goto modeset_cleanup;
>  
> -	drm_fbdev_generic_setup(&qdev->ddev, 32);
> +	drm_fbdev_generic_setup(&qdev->ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  	return 0;
>  
>  modeset_cleanup:
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> index 957ea97541d5..c2c1523c5c47 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> @@ -681,7 +681,7 @@ static int rcar_du_probe(struct platform_device *pdev)
>  
>  	DRM_INFO("Device %s probed\n", dev_name(&pdev->dev));
>  
> -	drm_fbdev_generic_setup(&rcdu->ddev, 32);
> +	drm_fbdev_generic_setup(&rcdu->ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
> index d858209cf8de..7fa653b28233 100644
> --- a/drivers/gpu/drm/sti/sti_drv.c
> +++ b/drivers/gpu/drm/sti/sti_drv.c
> @@ -200,7 +200,7 @@ static int sti_bind(struct device *dev)
>  
>  	drm_mode_config_reset(ddev);
>  
> -	drm_fbdev_generic_setup(ddev, 32);
> +	drm_fbdev_generic_setup(ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
> index 0da7cce2a1a2..36301d93e566 100644
> --- a/drivers/gpu/drm/stm/drv.c
> +++ b/drivers/gpu/drm/stm/drv.c
> @@ -203,7 +203,7 @@ static int stm_drm_platform_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_put;
>  
> -	drm_fbdev_generic_setup(ddev, 16);
> +	drm_fbdev_generic_setup(ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, 16));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
> index 275f7e4a03ae..2ec41525fe86 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_drv.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
> @@ -112,7 +112,7 @@ static int sun4i_drv_bind(struct device *dev)
>  	if (ret)
>  		goto finish_poll;
>  
> -	drm_fbdev_generic_setup(drm, 32);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/tidss/tidss_drv.c b/drivers/gpu/drm/tidss/tidss_drv.c
> index 04cfff89ee51..83bcfdc6d654 100644
> --- a/drivers/gpu/drm/tidss/tidss_drv.c
> +++ b/drivers/gpu/drm/tidss/tidss_drv.c
> @@ -180,7 +180,7 @@ static int tidss_probe(struct platform_device *pdev)
>  		goto err_irq_uninstall;
>  	}
>  
> -	drm_fbdev_generic_setup(ddev, 32);
> +	drm_fbdev_generic_setup(ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	dev_dbg(dev, "%s done\n", __func__);
>  
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> index eee3c447fbac..e342ea5031c8 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> @@ -384,7 +384,7 @@ static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
>  		goto init_failed;
>  	priv->is_registered = true;
>  
> -	drm_fbdev_generic_setup(ddev, bpp);
> +	drm_fbdev_generic_setup(ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, bpp));
>  	return 0;
>  
>  init_failed:
> diff --git a/drivers/gpu/drm/tiny/arcpgu.c b/drivers/gpu/drm/tiny/arcpgu.c
> index f0fa3b15c341..7f291db460e9 100644
> --- a/drivers/gpu/drm/tiny/arcpgu.c
> +++ b/drivers/gpu/drm/tiny/arcpgu.c
> @@ -392,7 +392,7 @@ static int arcpgu_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_unload;
>  
> -	drm_fbdev_generic_setup(&arcpgu->drm, 16);
> +	drm_fbdev_generic_setup(&arcpgu->drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 16));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
> index ed971c8bb446..fc52d9e7d50e 100644
> --- a/drivers/gpu/drm/tiny/bochs.c
> +++ b/drivers/gpu/drm/tiny/bochs.c
> @@ -663,7 +663,7 @@ static int bochs_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent
>  	if (ret)
>  		goto err_free_dev;
>  
> -	drm_fbdev_generic_setup(dev, 32);
> +	drm_fbdev_generic_setup(dev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  	return ret;
>  
>  err_free_dev:
> diff --git a/drivers/gpu/drm/tve200/tve200_drv.c b/drivers/gpu/drm/tve200/tve200_drv.c
> index 6d9d2921abf4..737cebb655a0 100644
> --- a/drivers/gpu/drm/tve200/tve200_drv.c
> +++ b/drivers/gpu/drm/tve200/tve200_drv.c
> @@ -226,7 +226,7 @@ static int tve200_probe(struct platform_device *pdev)
>  	 * Passing in 16 here will make the RGB565 mode the default
>  	 * Passing in 32 will use XRGB8888 mode
>  	 */
> -	drm_fbdev_generic_setup(drm, 16);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 16));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/vboxvideo/vbox_drv.c b/drivers/gpu/drm/vboxvideo/vbox_drv.c
> index f4f2bd79a7cb..fbe1f7368d53 100644
> --- a/drivers/gpu/drm/vboxvideo/vbox_drv.c
> +++ b/drivers/gpu/drm/vboxvideo/vbox_drv.c
> @@ -79,7 +79,7 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	if (ret)
>  		goto err_irq_fini;
>  
> -	drm_fbdev_generic_setup(&vbox->ddev, 32);
> +	drm_fbdev_generic_setup(&vbox->ddev, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
> index 162bc18e7497..ecd2b41b87b3 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.c
> +++ b/drivers/gpu/drm/vc4/vc4_drv.c
> @@ -291,7 +291,7 @@ static int vc4_drm_bind(struct device *dev)
>  	if (ret < 0)
>  		goto unbind_all;
>  
> -	drm_fbdev_generic_setup(drm, 16);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 16));
>  
>  	return 0;
>  
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
> index 5f25a8d15464..ef1e1b6e8cac 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
> @@ -128,7 +128,7 @@ static int virtio_gpu_probe(struct virtio_device *vdev)
>  	if (ret)
>  		goto err_deinit;
>  
> -	drm_fbdev_generic_setup(vdev->priv, 32);
> +	drm_fbdev_generic_setup(vdev->priv, DRM_FB_SET_OPTION(DRM_FB_BPP, 32));
>  	return 0;
>  
>  err_deinit:
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
> index 824b510e337b..2937e72d9fac 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
> @@ -135,7 +135,7 @@ static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
>  		goto err_poll_fini;
>  
>  	/* Initialize fbdev generic emulation. */
> -	drm_fbdev_generic_setup(drm, 24);
> +	drm_fbdev_generic_setup(drm, DRM_FB_SET_OPTION(DRM_FB_BPP, 24));
>  
>  	return 0;
>  
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index 3af4624368d8..1da3ef76f499 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -35,6 +35,7 @@ struct drm_fb_helper;
>  #include <drm/drm_client.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_device.h>
> +#include <linux/bitfield.h>
>  #include <linux/kgdb.h>
>  
>  enum mode_set_atomic {
> @@ -42,6 +43,17 @@ enum mode_set_atomic {
>  	ENTER_ATOMIC_MODE_SET,
>  };
>  
> +#define DRM_FB_BPP_MASK GENMASK(7, 0)
> +
> +/* Using the GNU statement expression extension */
> +#define DRM_FB_SET_OPTION(option, value)			\
> +	({							\
> +		WARN_ON(!FIELD_FIT(option##_MASK, value));	\
> +		FIELD_PREP(option##_MASK, value);		\
> +	})
> +
> +#define DRM_FB_GET_OPTION(option, word) FIELD_GET(option##_MASK, word)
> +
>  /**
>   * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
>   * @fb_width: fbdev width

-- 
Regards,

Laurent Pinchart

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