linux-kernel - Re: [PATCH] ARM: imx_v6_v7_defconfig: Select CONFIG_FB

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Date:	Thu, 8 Jan 2015 11:30:24 +0800
From:	Liu Ying <liu.y.victor@...il.com>
To:	Fabio Estevam <festevam@...il.com>
Cc:	Shawn Guo <shawn.guo@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: [PATCH] ARM: imx_v6_v7_defconfig: Select CONFIG_FB_MXS

2015-01-08 7:35 GMT+08:00 Fabio Estevam <festevam@...il.com>:
> From: Fabio Estevam <fabio.estevam@...escale.com>
>
> CONFIG_FB_MXS is the LCD driver for mx6solo-lite and mx6solox.
>
> Enable it by default.

I'm not sure if it is suitable to enable CONFIG_FB_MXS by default.
At least, I have no strong objections.

I am considering to add a LCDIF CRTC driver to the imx-drm framework
so that we may use the existing LDB drm driver to support the mx6solox
LVDS interface.

I see the i915 and omap2 fb drivers depend on !DRM_XXXX:

grep DRM_ drivers/video/fbdev/ -nr
drivers/video/fbdev/omap2/omapfb/Kconfig:3:        depends on FB &&
OMAP2_DSS && !DRM_OMAP
drivers/video/fbdev/Kconfig:1197:       depends on !DRM_I915

So, similarly, we'll probably have two LCDIF drivers and make the DRM
one enabled by default - finally, CONFIG_FB_MXS is disabled.

Another concern is the compatibility. Since both the framebuffer driver
and the imx-drm driver would export the framebuffer interface to the
user space, we'd better to keep the interface behavior the same.
Maybe, this is not a big problem, because we need to keep the compatibility
anyway...

Regards,
Liu Ying

>
> Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
> ---
>  arch/arm/configs/imx_v6_v7_defconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
> index 9575af8..1f36977 100644
> --- a/arch/arm/configs/imx_v6_v7_defconfig
> +++ b/arch/arm/configs/imx_v6_v7_defconfig
> @@ -203,6 +203,7 @@ CONFIG_DRM_PANEL_SIMPLE=y
>  CONFIG_LCD_CLASS_DEVICE=y
>  CONFIG_LCD_L4F00242T03=y
>  CONFIG_LCD_PLATFORM=y
> +CONFIG_FB_MXS=y
>  CONFIG_BACKLIGHT_PWM=y
>  CONFIG_BACKLIGHT_GPIO=y
>  CONFIG_FRAMEBUFFER_CONSOLE=y
> --
> 1.9.1
>
> --
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-- 
Best Regards,
Liu Ying
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