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

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Message-ID: <f2783a49-c60c-42ac-9b37-b71c253fb1cf@suse.de>
Date: Wed, 17 Sep 2025 16:41:15 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Prasanna Kumar T S M <ptsm@...ux.microsoft.com>,
 dri-devel@...ts.freedesktop.org, linux-hyperv@...r.kernel.org,
 linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 ssengar@...ux.microsoft.com, mhklinux@...look.com, rdunlap@...radead.org,
 bartosz.golaszewski@...aro.org, gonzalo.silvalde@...il.com, arnd@...db.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



Am 17.09.25 um 16:03 schrieb Prasanna Kumar T S M:
> 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>

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   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;
>   

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)