| Message ID | 1431560520-12544-1-git-send-email-hauke@hauke-m.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, May 14, 2015 at 01:42:00AM +0200, Hauke Mehrtens wrote: > diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c > index e309c8f..f919548 100644 > --- a/arch/arm/mm/cache-l2x0.c > +++ b/arch/arm/mm/cache-l2x0.c > @@ -1149,6 +1149,16 @@ static void __init l2c310_of_parse(const struct device_node *np, > } > } > > + if (of_property_read_bool(np, "arm,prefetch-data")) { > + *aux_val |= L310_AUX_CTRL_DATA_PREFETCH; > + *aux_mask &= ~L310_AUX_CTRL_DATA_PREFETCH; > + } > + > + if (of_property_read_bool(np, "arm,prefetch-instr")) { > + *aux_val |= L310_AUX_CTRL_INSTR_PREFETCH; > + *aux_mask &= ~L310_AUX_CTRL_INSTR_PREFETCH; > + } > + > prefetch = l2x0_saved_regs.prefetch_ctrl; > > ret = of_property_read_u32(np, "arm,double-linefill", &val); Please move these down along-side the "arm,prefetch-offset" property parsing, and please update the prefetch value using L310_PREFETCH_CTRL_DATA_PREFETCH and L310_PREFETCH_CTRL_INSTR_PREFETCH instead. These are in fact the same bit, but let's try to keep the prefetch configuration all in one place and via the same method.
diff --git a/Documentation/devicetree/bindings/arm/l2cc.txt b/Documentation/devicetree/bindings/arm/l2cc.txt index 0dbabe9..528821a 100644 --- a/Documentation/devicetree/bindings/arm/l2cc.txt +++ b/Documentation/devicetree/bindings/arm/l2cc.txt @@ -67,6 +67,10 @@ Optional properties: disable if zero. - arm,prefetch-offset : Override prefetch offset value. Valid values are 0-7, 15, 23, and 31. +- arm,prefetch-data : Enable data prefetch. Enabling prefetching + can improve performance. +- arm,prefetch-instr : Enable instruction prefetch. Enabling prefetching + can improve performance. Example: diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index e309c8f..f919548 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -1149,6 +1149,16 @@ static void __init l2c310_of_parse(const struct device_node *np, } } + if (of_property_read_bool(np, "arm,prefetch-data")) { + *aux_val |= L310_AUX_CTRL_DATA_PREFETCH; + *aux_mask &= ~L310_AUX_CTRL_DATA_PREFETCH; + } + + if (of_property_read_bool(np, "arm,prefetch-instr")) { + *aux_val |= L310_AUX_CTRL_INSTR_PREFETCH; + *aux_mask &= ~L310_AUX_CTRL_INSTR_PREFETCH; + } + prefetch = l2x0_saved_regs.prefetch_ctrl; ret = of_property_read_u32(np, "arm,double-linefill", &val);
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> --- Documentation/devicetree/bindings/arm/l2cc.txt | 4 ++++ arch/arm/mm/cache-l2x0.c | 10 ++++++++++ 2 files changed, 14 insertions(+)