diff options
Diffstat (limited to 'payloads/libpayload/drivers/timer')
| -rw-r--r-- | payloads/libpayload/drivers/timer/ipq806x.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/payloads/libpayload/drivers/timer/ipq806x.c b/payloads/libpayload/drivers/timer/ipq806x.c index 4edbf8eda0..0d70a86813 100644 --- a/payloads/libpayload/drivers/timer/ipq806x.c +++ b/payloads/libpayload/drivers/timer/ipq806x.c @@ -29,13 +29,31 @@ #include <libpayload.h> +/* + * TODO(vbendeb): reverted this hack once proper timer code is in place (see + * http://crosbug.com/p/28880 for details. + */ +#define MIN_TIMER_FREQ 1000000 + uint64_t timer_hz(void) { - return CONFIG_LP_IPQ806X_TIMER_FREQ; + return (CONFIG_LP_IPQ806X_TIMER_FREQ >= MIN_TIMER_FREQ) ? + CONFIG_LP_IPQ806X_TIMER_FREQ : MIN_TIMER_FREQ; } uint64_t timer_raw_value(void) { - return readl((void *)CONFIG_LP_IPQ806X_TIMER_REG); + uint64_t rawv = readl((void *)CONFIG_LP_IPQ806X_TIMER_REG); + + /* + * This is extremely crude, but it kicks in only for the case when the + * timer clock frequency is below 1MHz, which should never be the case + * on a properly configured system. The compiler will eliminate the + * check as long as config value exceeds 1MHz. + */ + if (CONFIG_LP_IPQ806X_TIMER_FREQ < MIN_TIMER_FREQ) + rawv *= (MIN_TIMER_FREQ / CONFIG_LP_IPQ806X_TIMER_FREQ); + + return rawv; } |