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 <ajaykumar...@samsung.com>
---
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
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