[PATCH master] ARM: i.MX7: enable caches when booted over USB

[Johannes Zink]

From: Ahmad Fatoum <a.fatoum at pengutronix.de>

BootROM on the i.MX7 doesn't set the SMP bit when booted
over serial download. This leads to vastly worse performance
when doing memory-heavy operations in a USB-booted system,
as the caches are not utilized. Example running md5sum over
a 25M image in ramfs:

  without patch: 10796ms
  with    patch: 457ms

This issue isn't unique to the i.MX7, but exists for the i.MX6UL as
well, which also has the Cortex-A7 as CPU. Like with
imx6ul_cpu_lowlevel_init(), adapt imx7_cpu_lowlevel_init() to avoid this
slow down.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
Signed-off-by: Johannes Zink <j.zink at pengutronix.de>
---
 arch/arm/mach-imx/cpu_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/cpu_init.c b/arch/arm/mach-imx/cpu_init.c
index ea36215419..ede2076102 100644
--- a/arch/arm/mach-imx/cpu_init.c
+++ b/arch/arm/mach-imx/cpu_init.c
@@ -49,7 +49,7 @@ void imx6ul_cpu_lowlevel_init(void)
 
 void imx7_cpu_lowlevel_init(void)
 {
-	arm_cpu_lowlevel_init();
+	cortex_a7_lowlevel_init();
 	imx_cpu_timer_init(IOMEM(MX7_SYSCNT_CTRL_BASE_ADDR));
 }
 
-- 
2.30.2