[XS] Change in coreboot[main]: mb/google/rauru: Raise little core CPU frequency from 700MHz to 2.4GHz

[Jarried Lin (Code Review)]

Jarried Lin has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/85773?usp=email )

Change subject: mb/google/rauru: Raise little core CPU frequency from 700MHz to 2.4GHz
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mb/google/rauru: Raise little core CPU frequency from 700MHz to 2.4GHz

To improve boot time, raise little CPU from 700MHz to 2.4GHz at romstage
(before DRAM calibration).

FW logs:
Check CPU freq: 2400120 KHz

BUG=b:317009620
TEST=Build pass, boot ok.

Change-Id: I14a31f3a51ca246b842cc0ef740c43ff5d857310
Signed-off-by: Jarried Lin 
---
M src/mainboard/google/rauru/romstage.c
1 file changed, 9 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/73/85773/1

diff --git a/src/mainboard/google/rauru/romstage.c b/src/mainboard/google/rauru/romstage.c
index 1d9a03b..e472a70 100644
--- a/src/mainboard/google/rauru/romstage.c
+++ b/src/mainboard/google/rauru/romstage.c
@@ -9,12 +9,21 @@
 #include <soc/mt6685.h>
 #include <soc/mtk_pwrsel.h>
 #include <soc/pcie.h>
+#include <soc/pll.h>
+
+static void raise_little_cpu_freq(void)
+{
+	mt6316_buck_set_voltage(0x8, MT6316_BUCK_3, 1050000);
+	printk(BIOS_INFO, "get vcpul:%d\n", mt6316_buck_get_voltage(0x8, MT6316_BUCK_3));
+	mt_pll_raise_little_cpu_freq(2400U * MHz);
+}

void platform_romstage_main(void)
 {
    irq2axi_disable();
    pwrsel_init();
    mt6316_init();
+	raise_little_cpu_freq();
    mt6363_init();
    mt6363_init_pmif_arb();
    mt6363_enable_vtref18(true);