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    SubjectRe: [PATCH] ARM: exynos_defconfig: Disable simplefb support
    Date
    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@osg.samsung.com>

    Reviewed-by/Tested-by: Michael Turquette <mturquette@baylibre.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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