1 From ec3bd0e68a679a7af2c46af1ddc9af8b534a8b0e Mon Sep 17 00:00:00 2001
2 From: Hauke Mehrtens <hauke@hauke-m.de>
3 Date: Wed, 10 Jun 2015 20:23:24 +0100
4 Subject: [PATCH] ARM: 8391/1: l2c: add options to overwrite prefetching
7 These options make it possible to overwrites the data and instruction
8 prefetching behavior of the arm pl310 cache controller.
10 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
11 Acked-by: Florian Fainelli <f.fainelli@gmail.com>
12 Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
14 Documentation/devicetree/bindings/arm/l2cc.txt | 5 +++++
15 arch/arm/mm/cache-l2x0.c | 20 ++++++++++++++++++++
16 2 files changed, 25 insertions(+)
18 --- a/Documentation/devicetree/bindings/arm/l2cc.txt
19 +++ b/Documentation/devicetree/bindings/arm/l2cc.txt
20 @@ -67,6 +67,11 @@ Optional properties:
22 - arm,prefetch-offset : Override prefetch offset value. Valid values are
24 +- prefetch-data : Data prefetch. Value: <0> (forcibly disable), <1>
25 + (forcibly enable), property absent (retain settings set by firmware)
26 +- prefetch-instr : Instruction prefetch. Value: <0> (forcibly disable),
27 + <1> (forcibly enable), property absent (retain settings set by
32 --- a/arch/arm/mm/cache-l2x0.c
33 +++ b/arch/arm/mm/cache-l2x0.c
34 @@ -1221,6 +1221,26 @@ static void __init l2c310_of_parse(const
35 pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n");
38 + ret = of_property_read_u32(np, "prefetch-data", &val);
41 + prefetch |= L310_PREFETCH_CTRL_DATA_PREFETCH;
43 + prefetch &= ~L310_PREFETCH_CTRL_DATA_PREFETCH;
44 + } else if (ret != -EINVAL) {
45 + pr_err("L2C-310 OF prefetch-data property value is missing\n");
48 + ret = of_property_read_u32(np, "prefetch-instr", &val);
51 + prefetch |= L310_PREFETCH_CTRL_INSTR_PREFETCH;
53 + prefetch &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH;
54 + } else if (ret != -EINVAL) {
55 + pr_err("L2C-310 OF prefetch-instr property value is missing\n");
58 l2x0_saved_regs.prefetch_ctrl = prefetch;