aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/bcm53xx/patches-4.1/075-ARM-8391-1-l2c-add-options-to-overwrite-prefetching-.patch
diff options
context:
space:
mode:
authorHauke Mehrtens <hauke@hauke-m.de>2015-06-25 21:43:16 +0000
committerHauke Mehrtens <hauke@hauke-m.de>2015-06-25 21:43:16 +0000
commitca49bcadae57798588a8f4c50916f71b1da2b86d (patch)
treeec30712fd3cf16b8072ff4fc58098d48bcc73594 /target/linux/bcm53xx/patches-4.1/075-ARM-8391-1-l2c-add-options-to-overwrite-prefetching-.patch
parent37fb5ab8934413d1428fddc32ae460c6a70c16e5 (diff)
downloadupstream-ca49bcadae57798588a8f4c50916f71b1da2b86d.tar.gz
upstream-ca49bcadae57798588a8f4c50916f71b1da2b86d.tar.bz2
upstream-ca49bcadae57798588a8f4c50916f71b1da2b86d.zip
bcm53xx: add arm l2c overwrite options like in mainline kernel
Instead of setting the l2c_aux_val variable in the board code make it possible to set these through device tree and make use of that. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> SVN-Revision: 46129
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-.patch60
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 0000000000..857d2c4380
--- /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;
+ }
+