1. Converting timeval to ktime_t, and there is no need to handle sec and usec separately
2. hp_sdc.rtv is only used for time diff, monotonic time is better here
Signed-off-by: WEN Pingbo pingbo.wen@linaro.org --- drivers/input/serio/hp_sdc.c | 16 ++++++---------- include/linux/hp_sdc.h | 6 +++--- 2 files changed, 9 insertions(+), 13 deletions(-)
diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c index 852858e..8ef82ee 100644 --- a/drivers/input/serio/hp_sdc.c +++ b/drivers/input/serio/hp_sdc.c @@ -193,7 +193,7 @@ static void hp_sdc_take(int irq, void *dev_id, uint8_t status, uint8_t data) curr->seq[curr->idx++] = status; curr->seq[curr->idx++] = data; hp_sdc.rqty -= 2; - do_gettimeofday(&hp_sdc.rtv); + hp_sdc.rtv = ktime_get();
if (hp_sdc.rqty <= 0) { /* All data has been gathered. */ @@ -306,13 +306,9 @@ static void hp_sdc_tasklet(unsigned long foo) write_lock_irq(&hp_sdc.rtq_lock);
if (hp_sdc.rcurr >= 0) { - struct timeval tv; + ktime_t time_diff = ktime_sub(ktime_get(), hp_sdc.rtv);
- do_gettimeofday(&tv); - if (tv.tv_sec > hp_sdc.rtv.tv_sec) - tv.tv_usec += USEC_PER_SEC; - - if (tv.tv_usec - hp_sdc.rtv.tv_usec > HP_SDC_MAX_REG_DELAY) { + if (time_diff.tv64 > HP_SDC_MAX_REG_DELAY) { hp_sdc_transaction *curr; uint8_t tmp;
@@ -321,8 +317,8 @@ static void hp_sdc_tasklet(unsigned long foo) * we'll need to figure out a way to communicate * it back to the application. and be less verbose. */ - printk(KERN_WARNING PREFIX "read timeout (%ius)!\n", - (int)(tv.tv_usec - hp_sdc.rtv.tv_usec)); + printk(KERN_WARNING PREFIX "read timeout (%llins)!\n", + time_diff.tv64); curr->idx += hp_sdc.rqty; hp_sdc.rqty = 0; tmp = curr->seq[curr->actidx]; @@ -551,7 +547,7 @@ unsigned long hp_sdc_put(void)
/* Start a new read */ hp_sdc.rqty = curr->seq[curr->idx]; - do_gettimeofday(&hp_sdc.rtv); + hp_sdc.rtv = ktime_get(); curr->idx++; /* Still need to lock here in case of spurious irq. */ write_lock_irq(&hp_sdc.rtq_lock); diff --git a/include/linux/hp_sdc.h b/include/linux/hp_sdc.h index d392975..348a9b5 100644 --- a/include/linux/hp_sdc.h +++ b/include/linux/hp_sdc.h @@ -47,9 +47,9 @@ #endif
-/* No 4X status reads take longer than this (in usec). +/* No 4X status reads take longer than this (in nsec). */ -#define HP_SDC_MAX_REG_DELAY 20000 +#define HP_SDC_MAX_REG_DELAY 20000000
typedef void (hp_sdc_irqhook) (int irq, void *dev_id, uint8_t status, uint8_t data); @@ -281,7 +281,7 @@ typedef struct { hp_sdc_transaction *tq[HP_SDC_QUEUE_LEN]; /* All pending read/writes */
int rcurr, rqty; /* Current read transact in process */ - struct timeval rtv; /* Time when current read started */ + ktime_t rtv; /* Time when current read started */ int wcurr; /* Current write transact in process */
int dev_err; /* carries status from registration */