diff options
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/sdio_irq.c | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c index 8843a4c2fe91..f78ffeefed52 100644 --- a/drivers/mmc/core/sdio_irq.c +++ b/drivers/mmc/core/sdio_irq.c @@ -27,7 +27,7 @@ static int process_sdio_pending_irqs(struct mmc_card *card) { - int i, ret; + int i, ret, count; unsigned char pending; ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending); @@ -37,6 +37,7 @@ static int process_sdio_pending_irqs(struct mmc_card *card) return ret; } + count = 0; for (i = 1; i <= 7; i++) { if (pending & (1 << i)) { struct sdio_func *func = card->sdio_func[i - 1]; @@ -46,20 +47,21 @@ static int process_sdio_pending_irqs(struct mmc_card *card) sdio_func_id(func)); } else if (func->irq_handler) { func->irq_handler(func); + count++; } else printk(KERN_WARNING "%s: pending IRQ with no handler\n", sdio_func_id(func)); } } - return 0; + return count; } static int sdio_irq_thread(void *_host) { struct mmc_host *host = _host; struct sched_param param = { .sched_priority = 1 }; - unsigned long period; + unsigned long period, idle_period; int ret; sched_setscheduler(current, SCHED_FIFO, ¶m); @@ -70,8 +72,9 @@ static int sdio_irq_thread(void *_host) * asynchronous notification of pending SDIO card interrupts * hence we poll for them in that case. */ + idle_period = msecs_to_jiffies(10); period = (host->caps & MMC_CAP_SDIO_IRQ) ? - MAX_SCHEDULE_TIMEOUT : msecs_to_jiffies(10); + MAX_SCHEDULE_TIMEOUT : idle_period; pr_debug("%s: IRQ thread started (poll period = %lu jiffies)\n", mmc_hostname(host), period); @@ -101,9 +104,24 @@ static int sdio_irq_thread(void *_host) * errors. FIXME: determine if due to card removal and * possibly exit this thread if so. */ - if (ret) + if (ret < 0) ssleep(1); + /* + * Adaptive polling frequency based on the assumption + * that an interrupt will be closely followed by more. + * This has a substantial benefit for network devices. + */ + if (!(host->caps & MMC_CAP_SDIO_IRQ)) { + if (ret > 0) + period /= 2; + else { + period++; + if (period > idle_period) + period = idle_period; + } + } + set_task_state(current, TASK_INTERRUPTIBLE); if (host->caps & MMC_CAP_SDIO_IRQ) host->ops->enable_sdio_irq(host, 1); |