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On Mon, Sep 30, 2013 at 4:50 PM, Ajay Kumar <[email protected]>wrote: > On Exynos5420, the FIMD sysmmus are in "on state" by default. > We have to disable them in order to make FIMD DMA work. > This patch adds the required framework to exynos_fimd driver > to disable FIMD sysmmu on Exynos5420. > > Signed-off-by: Ajay Kumar <[email protected]> > --- > arch/arm/dts/exynos5420.dtsi | 5 +++++ > doc/device-tree-bindings/video/exynos-fb.txt | 2 ++ > drivers/video/exynos_fimd.c | 12 ++++++++++++ > 3 files changed, 19 insertions(+) > > diff --git a/arch/arm/dts/exynos5420.dtsi b/arch/arm/dts/exynos5420.dtsi > index ca6c605..2d64df8 100644 > --- a/arch/arm/dts/exynos5420.dtsi > +++ b/arch/arm/dts/exynos5420.dtsi > @@ -71,4 +71,9 @@ > reg = <0x12E20000 0x100>; > interrupts = <0 203 0>; > }; > + > + fimd@14400000 { > + /* sysmmu is not used in U-Boot */ > + samsung,disable-sysmmu; > + }; > }; > diff --git a/doc/device-tree-bindings/video/exynos-fb.txt > b/doc/device-tree-bindings/video/exynos-fb.txt > index bb7441c..cddb505 100644 > --- a/doc/device-tree-bindings/video/exynos-fb.txt > +++ b/doc/device-tree-bindings/video/exynos-fb.txt > @@ -55,6 +55,8 @@ Board(panel specific): > samsung,pclk-name: parent clock identifier: 1(MPLL), 2(EPLL), > 3(VPLL) > samsung,sclk-div: parent_clock/source_clock ratio > samsung,dual-lcd-enabled: 1 if you support two LCD, else 0 > + samsung,disable-sysmmu: present if you want to disable the sysmmu > + (needed for Exynos5420) > > Example: > SOC specific part: > diff --git a/drivers/video/exynos_fimd.c b/drivers/video/exynos_fimd.c > index 8c2de4e..410fff1 100644 > --- a/drivers/video/exynos_fimd.c > +++ b/drivers/video/exynos_fimd.c > @@ -267,6 +267,18 @@ void exynos_fimd_lcd_init(vidinfo_t *vid) > node, > "reg"); > if (fimd_ctrl == NULL) > debug("Can't get the FIMD base address\n"); > + > + if (fdtdec_get_bool(gd->fdt_blob, node, "samsung,disable-sysmmu")) > { > + /* > + * The reset value for FIMD SYSMMU registers > + * MMU_CTRL:0x14640000 and MMU_CTRL:0x14680000 is 3. > + * This means FIMD SYSMMU is on by default on Exynos5420. > + * Since in u-boot we don't use SYSMMU, we are disabling > + * FIMD SYSMMU. > + */ > + writel(0x0, 0x14640000); > + writel(0x0, 0x14680000); > + } > #else > fimd_ctrl = (struct exynos_fb *)samsung_get_base_fimd(); > #endif > -- > 1.7.12.4 > > _______________________________________________ > U-Boot mailing list > [email protected] > http://lists.denx.de/mailman/listinfo/u-boot >
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