diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-omap/android-display.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/android-display.c b/arch/arm/plat-omap/android-display.c index c044b59..ad0acb7 100644 --- a/arch/arm/plat-omap/android-display.c +++ b/arch/arm/plat-omap/android-display.c @@ -28,6 +28,31 @@ #include <plat/dsscomp.h> #include <plat/vram.h> +/* Default IOBUFS size guaranteed that the memory used for early boot + * framebuffer will be overlapped by IOBUFS allocation, therefore + * won't be written to and there will be no extra output until video + * driver is initialized properly. + * + * With smaller IOBUFS size that framebuffer area becomes exposed + * to the system, hence the phone displays all the random garbabe + * that's in that memory region until video driver is initialized. + * + * While harmless, it looks ugly, so we'd better correct it. The + * easiest way to do it is to force VRAM allocation during the boot + * that overlaps with earlier framebuffer address. + * + * Given that for tuna devices lcd_bootfb equals 0xbea70000 at + * the boot and VRAM size is 7.5MB, allocating VRAM at 0xbea00000 + * ensures that LCD range is fully covered. + * + * Cleaner solution would be to parse that parameter and calculate + * the necessary address dynamically, but for now hard-coded value + * will do. */ +#define OMAP_VRAM_START 0xbea00000 +/* Make sure we override VRAM region only if IOBUFS is small enough + * so that we don't overlap with it. */ +#define OMAP_MAX_IOBUFS_SIZE ((OMAP_VRAM_START - 0xba300000) / 1024 / 1024) + struct omap_android_display_data { /* members with default values */ u32 width; @@ -191,8 +216,16 @@ static void set_vram_sizes(struct sgx_omaplfb_config *sgx_config, vram += fb->mem_desc.region[i].size; } +#if defined(CONFIG_ION_OMAP_IPU_MEM_IOBUFS_SIZE) && \ + CONFIG_ION_OMAP_IPU_MEM_IOBUFS_SIZE <= OMAP_MAX_IOBUFS_SIZE + /* See comments above for OMAP_VRAM_START for justification. */ + pr_info("android_display: setting vram to %u at address 0x%x\n", + vram, OMAP_VRAM_START); + omap_vram_set_sdram_vram(vram, OMAP_VRAM_START); +#else pr_info("android_display: setting vram to %u\n", vram); omap_vram_set_sdram_vram(vram, 0); +#endif } static void set_ion_carveouts(struct sgx_omaplfb_config *sgx_config, |