This patch sets CNTVOFF of ARM CP15 timer to zero to make sure the virtual
counter is fully usable for linux kernel.
Cc: Albert Aribaud <albert.u.b...@aribaud.net>
Signed-off-by: Weijie Gao <weijie....@mediatek.com>
---
arch/arm/mach-mediatek/mt7629/lowlevel_init.S | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/arch/arm/mach-mediatek/mt7629/lowlevel_init.S
b/arch/arm/mach-mediatek/mt7629/lowlevel_init.S
index 3375796b79..0a0672cbea 100644
--- a/arch/arm/mach-mediatek/mt7629/lowlevel_init.S
+++ b/arch/arm/mach-mediatek/mt7629/lowlevel_init.S
@@ -4,6 +4,7 @@
*/
#include <linux/linkage.h>
+#include <asm/proc-armv/ptrace.h>
#define WAIT_CODE_SRAM_BASE 0x0010ff00
@@ -27,6 +28,18 @@ ENTRY(lowlevel_init)
movt r0, #0x131
mcr p15, 0, r0, c14, c0, 0
+ cps #MON_MODE
+ mrc p15, 0, r1, c1, c1, 0 @ Get Secure Config
+ orr r0, r1, #1
+ mcr p15, 0, r0, c1, c1, 0 @ Set Non Secure bit
+ isb
+ mov r0, #0
+ mcrr p15, 4, r0, r0, c14 @ CNTVOFF = 0
+ isb
+ mcr p15, 0, r1, c1, c1, 0 @ Set Secure bit
+ isb
+ cps #SVC_MODE
+
/* enable SMP bit */
mrc p15, 0, r0, c1, c0, 1
orr r0, r0, #0x40
--
2.17.1
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