ARCv2: SLC: Make sure busy bit is set properly for region ops

c70c473 "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 <[email protected]> Cc: [email protected] #4.10 Signed-off-by: Vineet Gupta <[email protected]>
SELinuxProject · Aug 4, 2017 · b37174d · b37174d
1 parent 33460f8
commit b37174d
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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);