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arc: Keep D$ enabled to work-around incomplete SLC flushing

Message ID 1489755637-19464-1-git-send-email-abrodkin@synopsys.com
State New
Headers show

Commit Message

Alexey Brodkin March 17, 2017, 1 p.m. UTC 
As reported in STAR 9001165532 if D$ is disabled SLC is not flushed
correctly which leads to loses of some data that were set before the flush.
That causes unexpected behavior after the flush.

For now just keep D$ enabled, only flush-invalidate it before IOC setup.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---
 arch/arc/mm/cache.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index d408fa21a07c..e0e83543e777 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -997,8 +997,8 @@  noinline void __init arc_ioc_setup(void)
 {
 	unsigned int ap_sz;
 
-	/* Flush + invalidate + disable L1 dcache */
-	__dc_disable();
+	/* Flush + invalidate L1 dcache */
+	__dc_entire_op(OP_FLUSH_N_INV);
 
 	/* Flush + invalidate SLC */
 	if (read_aux_reg(ARC_REG_SLC_BCR))