From 04f38d1a4db017f17e82442727b91ce03dd72759 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= Date: Thu, 20 Jun 2024 17:26:45 +0200 Subject: [PATCH 4/4] mips: bmips: enable RAC on BMIPS4350 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The data RAC is left disabled by the bootloader in some SoCs, at least in the core it boots from. Enabling this feature increases the performance up to +30% depending on the task. Signed-off-by: Daniel González Cabanelas Signed-off-by: Álvaro Fernández Rojas [ rework code and reduce code duplication ] Acked-by: Florian Fainelli Signed-off-by: Christian Marangi Signed-off-by: Thomas Bogendoerfer --- arch/mips/kernel/smp-bmips.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) --- a/arch/mips/kernel/smp-bmips.c +++ b/arch/mips/kernel/smp-bmips.c @@ -592,6 +592,7 @@ asmlinkage void __weak plat_wired_tlb_se void bmips_cpu_setup(void) { void __iomem __maybe_unused *cbr = bmips_cbr_addr; + u32 __maybe_unused rac_addr; u32 __maybe_unused cfg; switch (current_cpu_type()) { @@ -620,6 +621,23 @@ void bmips_cpu_setup(void) __raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE); break; + case CPU_BMIPS4350: + rac_addr = BMIPS_RAC_CONFIG_1; + + if (!(read_c0_brcm_cmt_local() & (1 << 31))) + rac_addr = BMIPS_RAC_CONFIG; + + /* Enable data RAC */ + cfg = __raw_readl(cbr + rac_addr); + __raw_writel(cfg | 0xf, cbr + rac_addr); + __raw_readl(cbr + rac_addr); + + /* Flush stale data out of the readahead cache */ + cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG); + __raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG); + __raw_readl(cbr + BMIPS_RAC_CONFIG); + break; + case CPU_BMIPS4380: /* CBG workaround for early BMIPS4380 CPUs */ switch (read_c0_prid()) {