target/linux/bmips/patches-5.15/204-mips-bmips-enable-RAC-on-BMIPS4350.patch

   1 From 7f862eaedac56b67972393f0a9affcd2fe53479b Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= <dgcbueu@gmail.com>
   3 Date: Sun, 18 Jun 2023 19:59:25 +0200
   4 Subject: [PATCH] mips: bmips: enable RAC on BMIPS4350
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
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   8
   9 The data RAC is left disabled by the bootloader in some SoCs, at least in
  10 the core it boots from.
  11 Enabling this feature increases the performance up to +30% depending on the
  12 task.
  13
  14 Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
  15 Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
  16 ---
  17  arch/mips/kernel/smp-bmips.c | 14 ++++++++++++++
  18  1 file changed, 14 insertions(+)
  19
  20 --- a/arch/mips/kernel/smp-bmips.c
  21 +++ b/arch/mips/kernel/smp-bmips.c
  22 @@ -614,6 +614,20 @@ void bmips_cpu_setup(void)
  23                 __raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
  24                 break;
  25
  26 +       case CPU_BMIPS4350:
  27 +               /* Enable data RAC */
  28 +               if (!(read_c0_brcm_cmt_local() & (1 << 31))) {
  29 +                       cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
  30 +                       __raw_writel(cfg | 0xa, cbr + BMIPS_RAC_CONFIG);
  31 +                       __raw_readl(cbr + BMIPS_RAC_CONFIG);
  32 +               } else {
  33 +                       cbr = (void __iomem *)0xff400000;
  34 +                       cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG_1);
  35 +                       __raw_writel(cfg | 0xa, cbr + BMIPS_RAC_CONFIG_1);
  36 +                       __raw_readl(cbr + BMIPS_RAC_CONFIG_1);
  37 +               }
  38 +               break;
  39 +
  40         case CPU_BMIPS4380:
  41                 /* CBG workaround for early BMIPS4380 CPUs */
  42                 switch (read_c0_prid()) {