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authorAlexey Brodkin <abrodkin@synopsys.com>2017-07-07 12:25:14 +0300
committerVineet Gupta <vgupta@synopsys.com>2017-08-04 13:50:07 +0530
commitb37174d95b0251611a80ef60abf03752e9d66d67 (patch)
treed2623b26d405e65cd5d57e720ea2db0d1db2a464 /arch/arc/mm/cache.c
parentARC: [plat-sim] Include this platform unconditionally (diff)
downloadlinux-dev-b37174d95b0251611a80ef60abf03752e9d66d67.tar.xz
linux-dev-b37174d95b0251611a80ef60abf03752e9d66d67.zip
ARCv2: SLC: Make sure busy bit is set properly for region ops
c70c473396cb "ARCv2: SLC: Make sure busy bit is set properly on SLC flushing" fixes problem for entire SLC operation where the problem was initially caught. But given a nature of the issue it is perfectly possible for busy bit to be read incorrectly even when region operation was started. So extending initial fix for regional operation as well. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: stable@vger.kernel.org #4.10 Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to '')
-rw-r--r--arch/arc/mm/cache.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index a867575a758b..bebc24cb7912 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -697,6 +697,9 @@ noinline void slc_op(phys_addr_t paddr, unsigned long sz, const int op)
write_aux_reg(ARC_REG_SLC_RGN_END, (paddr + sz + l2_line_sz - 1));
write_aux_reg(ARC_REG_SLC_RGN_START, paddr);
+ /* Make sure "busy" bit reports correct stataus, see STAR 9001165532 */
+ read_aux_reg(ARC_REG_SLC_CTRL);
+
while (read_aux_reg(ARC_REG_SLC_CTRL) & SLC_CTRL_BUSY);
spin_unlock_irqrestore(&lock, flags);