linux-kernel - Re: [PATCH] ARM: exynos_defconfig: Disable simplefb support

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Date:	Fri, 11 Sep 2015 08:25:51 -0700
From:	Michael Turquette <mturquette@...libre.com>
To:	Javier Martinez Canillas <javier@....samsung.com>,
	linux-kernel@...r.kernel.org
Cc:	"Javier Martinez Canillas" <javier@....samsung.com>,
	"Kukjin Kim" <kgene@...nel.org>,
	"Thierry Reding" <treding@...dia.com>,
	"Anand Moon" <linux.amoon@...il.com>,
	"Russell King" <linux@....linux.org.uk>,
	linux-samsung-soc@...r.kernel.org,
	"Krzysztof Kozlowski" <k.kozlowski@...sung.com>,
	"Lukasz Majewski" <l.majewski@...sung.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: exynos_defconfig: Disable simplefb support

Quoting Javier Martinez Canillas (2015-09-10 06:42:32)
> The simplefb driver allows the kernel to render on a pre-allocated
> buffer that's been initialized by firmware before the kernel boots.
> 
> This option was enabled to have display working on the Exynos5250
> Snow Chromebook by commit da9d0fbf5e9a ("ARM: exynos: defconfig
> update") since proper DRM/KMS support did not exist at that time.
> 
> But now that the Exynos DRM driver has support for this hardware,
> there is no need to have simplefb enabled. In fact, if a user has
> a u-boot that injects the simplefb dev node to the FDT before pass
> it to the kernel, display won't be properly initialized and only a
> blank screen will be shown since there isn't a proper handoff from
> the simplefb driver to the Exynos DRM driver.
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

Reviewed-by/Tested-by: Michael Turquette <mturquette@...libre.com>

Thanks, this resolved one of the issues I had with U-boot that injected
the simplefb node.

Regards,
Mike

> 
> ---
> 
>  arch/arm/configs/exynos_defconfig | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
> index 62f677f76a0b..20d878c83193 100644
> --- a/arch/arm/configs/exynos_defconfig
> +++ b/arch/arm/configs/exynos_defconfig
> @@ -139,7 +139,6 @@ CONFIG_DRM_EXYNOS_DSI=y
>  CONFIG_DRM_EXYNOS_HDMI=y
>  CONFIG_DRM_PANEL_SIMPLE=y
>  CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0=y
> -CONFIG_FB_SIMPLE=y
>  CONFIG_EXYNOS_VIDEO=y
>  CONFIG_EXYNOS_MIPI_DSI=y
>  CONFIG_LCD_CLASS_DEVICE=y
> -- 
> 2.4.3
> 
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