erebion/coreboot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

soc/mediatek/common: Correct MT6359 RTC EOSC setting

Browse source 
According to the MT6359 datasheet, set the RTC EOSC calibration period
to 8 seconds to ensure that the power source VXO22 in the MT6359 meets
the expected power sequence in AP power-off mode.

BUG=b:397292746
BRANCH=none
TEST=build pass & boot pass

Change-Id: I4043f4e82baeb8e0358e74dd6d088895e4deb0f4
Signed-off-by: Shunxi Zhang <ot_shunxi.zhang@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87705
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:
Shunxi Zhang 2025-05-09 17:56:10 +08:00 • committed by Yidi Lin
commit b9a4d6ede1
2 changed files with 9 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/soc/mediatek/common/include/soc/rtc_mt6359p.h
View file

@ -72,6 +72,10 @@ enum {
RTC_TC_MTH_MASK = 0xf,
};
enum {
RTC_EOSC_CALI_TD_DEFAULT = 6U << 5,
};
enum {
RTC_K_EOSC_RSV_0 = 1 << 8,
RTC_K_EOSC_RSV_1 = 1 << 9,

5
src/soc/mediatek/common/rtc_mt6359p.c
View file

@ -220,6 +220,7 @@ int rtc_init(int recover)
{
int ret;
u16 year;
u16 al_dow;
rtc_info("recovery: %d\n", recover);
@ -256,6 +257,10 @@ int rtc_init(int recover)
goto err;
}
/* RTC EOSC calibration period setting and day-of-week value of alarm counter setting */
rtc_read(RTC_AL_DOW, &al_dow);
rtc_write(RTC_AL_DOW, al_dow | RTC_EOSC_CALI_TD_DEFAULT);
/* solution1 for EOSC cali*/
rtc_read(RTC_AL_YEA, &year);
rtc_write(RTC_AL_YEA, (year | RTC_K_EOSC_RSV_0) & (~RTC_K_EOSC_RSV_1)