diff options
| author | Jeffy Chen <jeffy.chen@rock-chips.com> | 2016-12-23 15:05:11 +0800 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2017-01-13 17:40:56 +0100 |
| commit | 9b2fe630d6a7144558224e4e5dfcc22d19b47a02 (patch) | |
| tree | 879e8e66e29248f25eec62435f245d8b739b5f45 /src/soc/rockchip | |
| parent | 605a87c8eb8672375f2a58191fe7ba8ebc83c42a (diff) | |
rockchip/rk3288: rtc-rk808: fix rtc time reading issue
After we set the GET_TIME bit, the rtc time can't be read immediately. We
should wait up to 31.25 us, about one cycle of 32khz. Otherwise reading
RTC time will return a old time.
BUG=chrome-os-partner:61078
BRANCH=veyron
TEST=Build and Boot
Original-Change-Id: I6ec07fc6c4d6d8b27b12031423b86b8ab15da6f6
Original-Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/423272
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Change-Id: I9806b624d6e968e51d52aab8c052ae3fa77f247d
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: b4b708e29fbae0d8f5a2cece79711aa6b1887727
Original-Change-Id: I8c168c14437bb932a59ac0e91a01062df0cf11dc
Original-Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/427522
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/18127
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/soc/rockchip')
| -rw-r--r-- | src/soc/rockchip/common/rk808.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/soc/rockchip/common/rk808.c b/src/soc/rockchip/common/rk808.c index dc6b2ea23f..a68b838f48 100644 --- a/src/soc/rockchip/common/rk808.c +++ b/src/soc/rockchip/common/rk808.c @@ -181,6 +181,12 @@ int rtc_get(struct rtc_time *time) rk808_clrsetbits(RTC_CTRL, RTC_CTRL_GET_TIME, 0); rk808_clrsetbits(RTC_CTRL, 0, RTC_CTRL_GET_TIME | RTC_CTRL_RTC_READSEL); + /* + * After we set the GET_TIME bit, the rtc time can't be read + * immediately. So we should wait up to 31.25 us. + */ + udelay(32); + ret |= rk808_read(RTC_SECOND, &value); time->sec = bcd2bin(value & 0x7f); |