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mb/google/skywalker: Add DVFS support in romstage

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Add the initialization in romstage.

BUG=b:410763782
BRANCH=none
TEST=Check the CPU frequencies are changing and not fixed values by
using the following commands in kernel:
1) set policy*/scaling_governor as "ondemand"
"echo ondemand > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor"
"echo ondemand > /sys/devices/system/cpu/cpufreq/policy6/scaling_governor"
2) Check the CPU frequencies by repeating the command
"grep . /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq"
The result is like
/sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq:650000
/sys/devices/system/cpu/cpufreq/policy6/scaling_cur_freq:2350000

Signed-off-by: Hope Wang <hope.wang@mediatek.corp-partner.google.com>
Change-Id: Ie64ebd1b78096c38c4398572cbed3e2e9ac6b8b6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87917
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yidi Lin <yidilin@google.com>
This commit is contained in:
Hope Wang 2025-04-29 21:08:25 +08:00 • committed by Yidi Lin
commit 94686e581a
1 changed files with 2 additions and 0 deletions
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2
src/mainboard/google/skywalker/romstage.c
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@ -2,6 +2,7 @@
#include <arch/stages.h>
#include <delay.h>
#include <soc/dvfs.h>
#include <soc/emi.h>
#include <soc/mt6315.h>
#include <soc/mt6359p.h>
@ -26,5 +27,6 @@ void platform_romstage_main(void)
mt6359p_init();
raise_little_cpu_freq();
rtc_boot();
dvfs_init();
mtk_dram_init();
}