On 29/05/15 16:19, Hauke Mehrtens wrote: > These options make it possible to overwrites the data and instruction > prefetching behavior of the arm pl310 cache controller. > > Signed-off-by: Hauke Mehrtens <[email protected]>
Acked-by: Florian Fainelli <[email protected]> > --- > changes since > v3: > * remove arm prefix > * improve documentation > v2: only set prefetch > v1: set prefetch and aux > Documentation/devicetree/bindings/arm/l2cc.txt | 5 +++++ > arch/arm/mm/cache-l2x0.c | 20 ++++++++++++++++++++ > 2 files changed, 25 insertions(+) > > diff --git a/Documentation/devicetree/bindings/arm/l2cc.txt > b/Documentation/devicetree/bindings/arm/l2cc.txt > index 0dbabe9..2251dcc 100644 > --- 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: > > diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c > index e309c8f..2570f83 100644 > --- a/arch/arm/mm/cache-l2x0.c > +++ b/arch/arm/mm/cache-l2x0.c > @@ -1199,6 +1199,26 @@ static void __init l2c310_of_parse(const struct > device_node *np, > 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; > } > > -- Florian -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
