From: Stefan Nilsson XK stefan.xk.nilsson@stericsson.com
If there is only 1 function registered it is possible to improve performance by avoiding the overhead of reading the CCCR registers and directly call the function handler.
Signed-off-by: Stefan Nilsson XK stefan.xk.nilsson@stericsson.com Signed-off-by: Per Forlin per.forlin@linaro.org --- drivers/mmc/core/sdio_irq.c | 14 ++++++++++++++ 1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c index b300161..25291bf 100644 --- a/drivers/mmc/core/sdio_irq.c +++ b/drivers/mmc/core/sdio_irq.c @@ -32,6 +32,20 @@ static int process_sdio_pending_irqs(struct mmc_card *card) int i, ret, count; unsigned char pending;
+ /* + * If there is only 1 function registered + * call irq directly without checking the CCCR registers. + */ + if ((card->host->caps & MMC_CAP_SDIO_IRQ) && + card->host->sdio_irqs && (card->sdio_funcs == 1)) + for (i = 0; i < SDIO_MAX_FUNCS; i++) { + struct sdio_func *func = card->sdio_func[i]; + if (func && func->irq_handler) { + func->irq_handler(func); + return 1; + } + } + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending); if (ret) { printk(KERN_DEBUG "%s: error %d reading SDIO_CCCR_INTx\n",