[PATCH] sdio: optimized SDIO IRQ handling for single function

[Nicolas Pitre]

On Tue, 3 May 2011, Per Forlin wrote:

> From: Stefan Nilsson XK <stefan.xk.nilsson at stericsson.com>
> 
> If there is only 1 function registered, and IRQ:s are supported and
> currently enabled, call the callback handler directly
> without checking the CCCR registers.
> 
> Signed-off-by: Stefan Nilsson XK <stefan.xk.nilsson at stericsson.com>
> Signed-off-by: Per Forlin <per.forlin at linaro.org>

Acked-by: Nicolas Pitre <nicolas.pitre at 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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