diff options
Diffstat (limited to 'drivers/video/exynos_fimd.c')
| -rw-r--r-- | drivers/video/exynos_fimd.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/video/exynos_fimd.c b/drivers/video/exynos_fimd.c index cebbba7..f67fa81 100644 --- a/drivers/video/exynos_fimd.c +++ b/drivers/video/exynos_fimd.c @@ -251,6 +251,45 @@ void exynos_fimd_window_off(unsigned int win_id) writel(cfg, &fimd_ctrl->winshmap); } +#ifdef CONFIG_OF_CONTROL +/* +* The reset value for FIMD SYSMMU register MMU_CTRL is 3 +* on Exynos5420 and newer versions. +* This means FIMD SYSMMU is on by default on Exynos5420 +* and newer versions. +* Since in u-boot we don't use SYSMMU, we should disable +* those FIMD SYSMMU. +* Note that there are 2 SYSMMU for FIMD: m0 and m1. +* m0 handles windows 0 and 4, and m1 handles windows 1, 2 and 3. +* We disable both of them here. +*/ +void exynos_fimd_disable_sysmmu(void) +{ + u32 *sysmmufimd; + unsigned int node; + int node_list[2]; + int count; + int i; + + count = fdtdec_find_aliases_for_id(gd->fdt_blob, "fimd", + COMPAT_SAMSUNG_EXYNOS_SYSMMU, node_list, 2); + for (i = 0; i < count; i++) { + node = node_list[i]; + if (node <= 0) { + debug("Can't get device node for fimd sysmmu\n"); + return; + } + + sysmmufimd = (u32 *)fdtdec_get_addr(gd->fdt_blob, node, "reg"); + if (!sysmmufimd) { + debug("Can't get base address for sysmmu fimdm0"); + return; + } + + writel(0x0, sysmmufimd); + } +} +#endif void exynos_fimd_lcd_init(vidinfo_t *vid) { @@ -268,6 +307,10 @@ 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")) + exynos_fimd_disable_sysmmu(); + #else fimd_ctrl = (struct exynos_fb *)samsung_get_base_fimd(); #endif |