From: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Date: Sun, 30 Aug 2015 22:55:49 +0000 (-0600)
Subject: arm: Turn of d-cache before i-cache
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=81b0618ddf449aab669b42068ad8c90f63714c14;p=u-boot.git

arm: Turn of d-cache before i-cache

Booting the kernel fails on RK3288 (and probably other rockchip SoCs)
when the i-cache is disabled/flushed before d-cache.

I have not investigated whether this is due to U-Boot hanging or whether
it's very early in the linux boot, but following the approach of the
various rockchip U-Boot forks (first disable d-cache then i-cache) makes
things work.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
---

diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
index 0b0e5003cc..6eac5ef3fe 100644
--- a/arch/arm/cpu/armv7/cpu.c
+++ b/arch/arm/cpu/armv7/cpu.c
@@ -36,12 +36,6 @@ int cleanup_before_linux_select(int flags)
 	disable_interrupts();
 #endif
 
-	/*
-	 * Turn off I-cache and invalidate it
-	 */
-	icache_disable();
-	invalidate_icache_all();
-
 	if (flags & CBL_DISABLE_CACHES) {
 		/*
 		* turn off D-cache
@@ -61,7 +55,16 @@ int cleanup_before_linux_select(int flags)
 		* to avoid coherency problems for kernel
 		*/
 		invalidate_dcache_all();
+
+		icache_disable();
+		invalidate_icache_all();
 	} else {
+		/*
+		 * Turn off I-cache and invalidate it
+		 */
+		icache_disable();
+		invalidate_icache_all();
+
 		flush_dcache_all();
 		invalidate_icache_all();
 		icache_enable();