Commit b37174d9 authored Jul 07, 2017 by Alexey Brodkin Committed by Vineet Gupta Aug 04, 2017

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



c70c4733 "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>

parent 33460f86

arch/arc/mm/cache.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

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