linux-kernel - Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko

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Date:	Tue, 29 Dec 2015 14:49:13 +0100
From:	Frans Klaver <fransklaver@...il.com>
To:	Sebastian Frias <sf84@...oste.net>
Cc:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	mason <slash.tmp@...e.fr>,
	Måns Rullgård <mans@...sr.com>
Subject: Re: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko

On Tue, Dec 29, 2015 at 2:15 PM, Sebastian Frias <sf84@...oste.net> wrote:
> Hi,
>
> We are wondering what is the recommended way of adding support for a
> framebuffer driver on the Linux kernel.
> Below you can find a patch with a proposed solution.

That's not really a solution to add a driver to the kernel. You'd have
to include some actual driver code as well.


> Our frambuffer driver source code is provided separately, but right now it
> requires "cfb_fillrect", "cfb_copyarea" and "cfb_imageblit" to be provided
> by the kernel.
>
> Our current kernel fork (based on 3.4) hardcodes FB_CFB_FILLRECT,
> FB_CFB_COPYAREA and FB_CFB_IMAGEBLIT to yes.
> Since we are in the process of migrating to 4.x and upstreaming changes
> along the way, we would like to know if the patch below is the way to go
> with it or if you have suggestions to improve it.

Is the below patch really a patch you intend to upstream, or are you
just wondering about what your Kconfig entry should look like when you
upstream your driver?


> Subject: [RFC PATCH] fbdev: add support for Sigma Designs' smp8xxxfb.ko
>
> Signed-off-by: Sebastian Frias <sf84@...oste.net>
> ---
>  drivers/video/fbdev/Kconfig |   10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
> index e6d16d6..46c4ab2 100644
> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -615,6 +615,16 @@ config FB_BF537_LQ035
>           To compile this driver as a module, choose M here: the
>           module will be called bf537-lq035.
>
> +config FB_TANGO
> +       bool "Sigma Designs FrameBuffer support"
> +       depends on FB && ARCH_TANGO
> +       select FB_CFB_FILLRECT
> +       select FB_CFB_COPYAREA
> +       select FB_CFB_IMAGEBLIT
> +       help
> +         You need to enable this if you intend to use Sigma
> +         Designs' smp8xxxfb.ko driver.
> +
>  config FB_BFIN_7393
>         tristate "Blackfin ADV7393 Video encoder"
>         depends on FB && BLACKFIN

Frans
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