linux-kernel - Re: [PATCH 1/2] fbdev/hyperv_fb: deprecate this in favor of Hyper-V DRM driver

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Message-ID: <20250918080453.GA17773@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Thu, 18 Sep 2025 01:04:53 -0700
From: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To: Prasanna Kumar T S M <ptsm@...ux.microsoft.com>
Cc: dri-devel@...ts.freedesktop.org, linux-hyperv@...r.kernel.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	mhklinux@...look.com, rdunlap@...radead.org,
	bartosz.golaszewski@...aro.org, gonzalo.silvalde@...il.com,
	arnd@...db.de, tzimmermann@...e.de, decui@...rosoft.com,
	wei.liu@...nel.org, deller@....de, kys@...rosoft.com,
	haiyangz@...rosoft.com
Subject: Re: [PATCH 1/2] fbdev/hyperv_fb: deprecate this in favor of Hyper-V
 DRM driver

On Wed, Sep 17, 2025 at 07:03:05AM -0700, Prasanna Kumar T S M wrote:
> The Hyper-V DRM driver is available since kernel version 5.14 and it
> provides full KMS support and fbdev emulation via the DRM fbdev helpers.
> Deprecate this driver in favor of Hyper-V DRM driver.
> 
> Signed-off-by: Prasanna Kumar T S M <ptsm@...ux.microsoft.com>
> ---
>  drivers/video/fbdev/Kconfig     | 5 ++++-
>  drivers/video/fbdev/hyperv_fb.c | 2 ++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
> index c21484d15f0c..48c1c7417f6d 100644
> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -1773,13 +1773,16 @@ config FB_BROADSHEET
>  	  a bridge adapter.
>  
>  config FB_HYPERV
> -	tristate "Microsoft Hyper-V Synthetic Video support"
> +	tristate "Microsoft Hyper-V Synthetic Video support (DEPRECATED)"
>  	depends on FB && HYPERV
>  	select DMA_CMA if HAVE_DMA_CONTIGUOUS && CMA
>  	select FB_IOMEM_HELPERS_DEFERRED
>  	help
>  	  This framebuffer driver supports Microsoft Hyper-V Synthetic Video.
>  
> +	  This driver is deprecated, please use the Hyper-V DRM driver at
> +	  drivers/gpu/drm/hyperv (CONFIG_DRM_HYPERV) instead.
> +
>  config FB_SIMPLE
>  	tristate "Simple framebuffer support"
>  	depends on FB
> diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
> index 75338ffc703f..c99e2ea4b3de 100644
> --- a/drivers/video/fbdev/hyperv_fb.c
> +++ b/drivers/video/fbdev/hyperv_fb.c
> @@ -1357,6 +1357,8 @@ static int __init hvfb_drv_init(void)
>  {
>  	int ret;
>  
> +	pr_warn("Deprecated: use Hyper-V DRM driver instead\n");
> +
>  	if (fb_modesetting_disabled("hyper_fb"))
>  		return -ENODEV;
>  
> -- 
> 2.49.0

Thanks for the patch. I hope it makes to the next LTS as planned.

Reviewed-by: Saurabh Sengar <ssengar@...ux.microsoft.com>