diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.1/075-ARM-8391-1-l2c-add-options-to-overwrite-prefetching-.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.1/075-ARM-8391-1-l2c-add-options-to-overwrite-prefetching-.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.1/075-ARM-8391-1-l2c-add-options-to-overwrite-prefetching-.patch b/target/linux/bcm53xx/patches-4.1/075-ARM-8391-1-l2c-add-options-to-overwrite-prefetching-.patch new file mode 100644 index 0000000..857d2c4 --- /dev/null +++ b/target/linux/bcm53xx/patches-4.1/075-ARM-8391-1-l2c-add-options-to-overwrite-prefetching-.patch @@ -0,0 +1,60 @@ +From ec3bd0e68a679a7af2c46af1ddc9af8b534a8b0e Mon Sep 17 00:00:00 2001 +From: Hauke Mehrtens <hauke@hauke-m.de> +Date: Wed, 10 Jun 2015 20:23:24 +0100 +Subject: [PATCH] ARM: 8391/1: l2c: add options to overwrite prefetching + behavior + +These options make it possible to overwrites the data and instruction +prefetching behavior of the arm pl310 cache controller. + +Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> +Acked-by: Florian Fainelli <f.fainelli@gmail.com> +Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> +--- + Documentation/devicetree/bindings/arm/l2cc.txt | 5 +++++ + arch/arm/mm/cache-l2x0.c | 20 ++++++++++++++++++++ + 2 files changed, 25 insertions(+) + +--- a/Documentation/devicetree/bindings/arm/l2cc.txt ++++ b/Documentation/devicetree/bindings/arm/l2cc.txt +@@ -67,6 +67,11 @@ Optional properties: + disable if zero. + - arm,prefetch-offset : Override prefetch offset value. Valid values are + 0-7, 15, 23, and 31. ++- prefetch-data : Data prefetch. Value: <0> (forcibly disable), <1> ++ (forcibly enable), property absent (retain settings set by firmware) ++- prefetch-instr : Instruction prefetch. Value: <0> (forcibly disable), ++ <1> (forcibly enable), property absent (retain settings set by ++ firmware) + + Example: + +--- a/arch/arm/mm/cache-l2x0.c ++++ b/arch/arm/mm/cache-l2x0.c +@@ -1221,6 +1221,26 @@ static void __init l2c310_of_parse(const + pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n"); + } + ++ ret = of_property_read_u32(np, "prefetch-data", &val); ++ if (ret == 0) { ++ if (val) ++ prefetch |= L310_PREFETCH_CTRL_DATA_PREFETCH; ++ else ++ prefetch &= ~L310_PREFETCH_CTRL_DATA_PREFETCH; ++ } else if (ret != -EINVAL) { ++ pr_err("L2C-310 OF prefetch-data property value is missing\n"); ++ } ++ ++ ret = of_property_read_u32(np, "prefetch-instr", &val); ++ if (ret == 0) { ++ if (val) ++ prefetch |= L310_PREFETCH_CTRL_INSTR_PREFETCH; ++ else ++ prefetch &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH; ++ } else if (ret != -EINVAL) { ++ pr_err("L2C-310 OF prefetch-instr property value is missing\n"); ++ } ++ + l2x0_saved_regs.prefetch_ctrl = prefetch; + } + |