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soc: bcm: brcmstb: biuctrl: Change RAC data line prefetching after 4 consecutive lines 

Change the RACPREFDATA(x) setting to prefetch the next 256-byte line
after 4 consecutive lines have been used, instead of after 2 consecutive
lines. This does improve the synthetic memcpy benchmark by an additional
+0.5% on top of the previous change for Cortex-A72 CPUs.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Florian Fainelli 2019-10-25 11:34:58 -07:00
parent 091353c88b
commit 10e7dd54cd
1 changed files with 6 additions and 2 deletions
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8
drivers/soc/bcm/brcmstb/biuctrl.c
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@ -174,7 +174,7 @@ static const u32 a72_b53_mach_compat[] = {
static void __init a72_b53_rac_enable_all(struct device_node *np)
{
unsigned int cpu;
u32 enable = 0, pref_dist;
u32 enable = 0, pref_dist, shift;
if (IS_ENABLED(CONFIG_CACHE_B15_RAC))
return;
@ -184,9 +184,13 @@ static void __init a72_b53_rac_enable_all(struct device_node *np)
pref_dist = cbc_readl(RAC_CONFIG1_REG);
for_each_possible_cpu(cpu) {
shift = cpu * RAC_CPU_SHIFT + RACPREFDATA_SHIFT;
enable |= RAC_DATA_INST_EN_MASK << (cpu * RAC_CPU_SHIFT);
if (cpubiuctrl_regs == a72_cpubiuctrl_regs)
if (cpubiuctrl_regs == a72_cpubiuctrl_regs) {
enable &= ~(RACENPREF_MASK << shift);
enable |= 3 << shift;
pref_dist |= 1 << (cpu + DPREF_LINE_2_SHIFT);
}
}
cbc_writel(enable, RAC_CONFIG0_REG);