Messages in this thread Patch in this message | | | From | Per Forlin <> | Subject | [PATCH resend] sdio: optimized SDIO IRQ handling for single function | Date | Tue, 3 May 2011 22:51:21 +0200 |
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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", -- 1.7.4.1
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