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mb/google/skywalker: Raise little core CPU frequency to 2.0 GHz

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Increase the CPU little core frequency from 1.6 GHz to 2.0 GHz to
speed up the boot process.

BUG=b:379008996
BRANCH=none
TEST=check little core cpu frequency is 2GHz in kernel by commands
clkdbg() { echo $@ > /proc/clkdbg ; cat /proc/clkdbg ; }
clkdbg fmeter

See the little core CPU frequency:
fm_armpll_ll_ck          	: 1999968

Signed-off-by: Zhigang Qin <zhigang.qin@mediatek.corp-partner.google.com>
Change-Id: I979f44e9340ea5bd733dc7f0fe47af47a4f403b7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87795
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Zhigang Qin 2025-03-13 16:29:32 +08:00 • committed by Yidi Lin
commit 0f2942b513
1 changed files with 13 additions and 0 deletions
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13
src/mainboard/google/skywalker/romstage.c
View file

@ -1,17 +1,30 @@
/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
#include <arch/stages.h>
#include <delay.h>
#include <soc/emi.h>
#include <soc/mt6315.h>
#include <soc/mt6359p.h>
#include <soc/pll.h>
#include <soc/pmif.h>
#include <soc/regulator.h>
#include <soc/rtc.h>
static void raise_little_cpu_freq(void)
{
mainboard_set_regulator_voltage(MTK_REGULATOR_VSRAM_PROC12, 1050000);
mainboard_set_regulator_voltage(MTK_REGULATOR_VPROC12, 1050000);
udelay(200);
mt_pll_raise_little_cpu_freq(2000 * MHz);
mt_pll_raise_cci_freq(1540 * MHz);
}
void platform_romstage_main(void)
{
mtk_pmif_init();
mt6315_init();
mt6359p_init();
raise_little_cpu_freq();
rtc_boot();
mtk_dram_init();
}