This patch set converts the Raspberry Pi 2 system to properly make use of the caches available in it.
Because we're running in HYP mode, we first need to teach U-Boot how to make use of HYP registers and the LPAE page layout which is mandated by hardware when running in HYP mode.
Then while we're at it, also mark the frame buffer cached to speed up screen updates.
With this patch set, my Raspberry Pi 3 running in AArch32 mode is a *lot* faster than without.
Please verify that the code works on a RPi2 as well and doesn't break the original Pi. In theory it should work, but I only have a 3 to test on available here.
v1 -> v2:
- Move to KConfig - Adapt to new config name "CONFIG_ARMV7_LPAE"
Alexander Graf (5): arm64: Add 32bit arm compatible dcache definitions arm: Add support for HYP mode and LPAE page tables lcd: Fix compile warning in 64bit mode RPi: Enable caches for rpi2 bcm2835 video: Map fb as cached
arch/arm/cpu/armv7/Kconfig | 8 ++++ arch/arm/include/asm/system.h | 105 +++++++++++++++++++++++++++++++++++++++--- arch/arm/lib/cache-cp15.c | 66 +++++++++++++++++++++++--- arch/arm/mach-bcm283x/Kconfig | 1 + arch/arm/mach-bcm283x/init.c | 7 +++ common/lcd.c | 4 +- drivers/video/bcm2835.c | 6 +++ include/configs/rpi_2.h | 1 - 8 files changed, 182 insertions(+), 16 deletions(-)