lkml.org 
[lkml]   [2017]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] ARCv2: SLC: Make sure busy bit is set properly for region ops
Date
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: Vineet Gupta <vgupta@synopsys.com>
Cc: stable@vger.kernel.org
---
arch/arc/mm/cache.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index bdb5227241cf..08427d572850 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -697,6 +697,8 @@ 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);
--
2.7.5
\
 
 \ /
  Last update: 2017-07-07 11:25    [W:0.029 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site