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-rw-r--r--target/linux/bmips/patches-5.15/204-mips-bmips-enable-RAC-on-BMIPS4350.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/bmips/patches-5.15/204-mips-bmips-enable-RAC-on-BMIPS4350.patch b/target/linux/bmips/patches-5.15/204-mips-bmips-enable-RAC-on-BMIPS4350.patch
new file mode 100644
index 0000000000..26bd03e329
--- /dev/null
+++ b/target/linux/bmips/patches-5.15/204-mips-bmips-enable-RAC-on-BMIPS4350.patch
@@ -0,0 +1,42 @@
+From 7f862eaedac56b67972393f0a9affcd2fe53479b Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= <dgcbueu@gmail.com>
+Date: Sun, 18 Jun 2023 19:59:25 +0200
+Subject: [PATCH] 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 <dgcbueu@gmail.com>
+Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+---
+ arch/mips/kernel/smp-bmips.c | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+--- a/arch/mips/kernel/smp-bmips.c
++++ b/arch/mips/kernel/smp-bmips.c
+@@ -614,6 +614,20 @@ void bmips_cpu_setup(void)
+ __raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
+ break;
+
++ case CPU_BMIPS4350:
++ /* Enable data RAC */
++ if (!(read_c0_brcm_cmt_local() & (1 << 31))) {
++ cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
++ __raw_writel(cfg | 0xa, cbr + BMIPS_RAC_CONFIG);
++ __raw_readl(cbr + BMIPS_RAC_CONFIG);
++ } else {
++ cbr = (void __iomem *)0xff400000;
++ cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG_1);
++ __raw_writel(cfg | 0xa, cbr + BMIPS_RAC_CONFIG_1);
++ __raw_readl(cbr + BMIPS_RAC_CONFIG_1);
++ }
++ break;
++
+ case CPU_BMIPS4380:
+ /* CBG workaround for early BMIPS4380 CPUs */
+ switch (read_c0_prid()) {