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| author | Michael Bestas <mkbestas@lineageos.org> | 2020-12-30 23:59:22 +0200 |
|---|---|---|
| committer | Michael Bestas <mkbestas@lineageos.org> | 2020-12-30 23:59:22 +0200 |
| commit | 8bca2095c58bfc17532ab9a6259d341decee1288 (patch) | |
| tree | 6d6fe55982d5b77d369095408ab60797bf9ed4cb /drivers/clocksource/arm_arch_timer.c | |
| parent | 96d93de231c6f2e261efe1307c0e9d23d62f3075 (diff) | |
| parent | 300d539b8e6e297ffd986afec63a88415eced57d (diff) | |
Merge branch 'android-4.4-p' of https://android.googlesource.com/kernel/common into lineage-18.1-caf-msm8998
This brings LA.UM.9.2.r1-01800-SDMxx0.0 up to date with
https://android.googlesource.com/kernel/common/ android-4.4-p at commit:
300d539b8e6e2 ANDROID: usb: f_accessory: Wrap '_acc_dev' in get()/put() accessors
Conflicts:
drivers/usb/gadget/function/f_accessory.c
include/linux/spi/spi.h
Change-Id: Ifef5bfcb9d92b6d560126f0216369c567476f55d
Diffstat (limited to 'drivers/clocksource/arm_arch_timer.c')
| -rw-r--r-- | drivers/clocksource/arm_arch_timer.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index bd55b201371e..78da251a5f5d 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -311,15 +311,24 @@ static void arch_timer_evtstrm_enable(int divider) static void arch_timer_configure_evtstream(void) { - int evt_stream_div, pos; + int evt_stream_div, lsb; + + /* + * As the event stream can at most be generated at half the frequency + * of the counter, use half the frequency when computing the divider. + */ + evt_stream_div = arch_timer_rate / ARCH_TIMER_EVT_STREAM_FREQ / 2; + + /* + * Find the closest power of two to the divisor. If the adjacent bit + * of lsb (last set bit, starts from 0) is set, then we use (lsb + 1). + */ + lsb = fls(evt_stream_div) - 1; + if (lsb > 0 && (evt_stream_div & BIT(lsb - 1))) + lsb++; - /* Find the closest power of two to the divisor */ - evt_stream_div = arch_timer_rate / ARCH_TIMER_EVT_STREAM_FREQ; - pos = fls(evt_stream_div); - if (pos > 1 && !(evt_stream_div & (1 << (pos - 2)))) - pos--; /* enable event stream */ - arch_timer_evtstrm_enable(min(pos, 15)); + arch_timer_evtstrm_enable(max(0, min(lsb, 15))); } static void arch_counter_set_user_access(void) |