diff options
| author | Stefan Nilsson XK <stefan.xk.nilsson@stericsson.com> | 2011-04-26 23:07:49 +0200 |
|---|---|---|
| committer | Henrik Aberg <henrik.aberg@stericsson.com> | 2011-05-18 09:40:08 +0200 |
| commit | cf76e455faedb8f85e38e2d9f3af3c6ee52237ee (patch) | |
| tree | 51ee1790cbfdc3475d507658d9af957a4b6a7d3a /drivers/mmc | |
| parent | 44fd3adcd961b7fa5ceaa01d1631101a5c51e6cc (diff) | |
SDIO: Optimized SDIO IRQ handling
If there is only 1 function registered, and IRQ:s are supported and
currently enabled, then there is no need to check the CCCR registers.
ST-Ericsson ID: ER318044
ST-Ericsson FOSS-OUT ID: Trivial
Change-Id: I99699bc6bb7e28b43bb88c977c1b8a09ad877ae3
Signed-off-by: Stefan Nilsson XK <stefan.xk.nilsson@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/21666
Reviewed-by: QATEST
Reviewed-by: Sebastian RASMUSSEN <sebastian.rasmussen@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/sdio_irq.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c index 69802351996..96f81237d75 100644 --- a/drivers/mmc/core/sdio_irq.c +++ b/drivers/mmc/core/sdio_irq.c @@ -34,6 +34,22 @@ static int process_sdio_pending_irqs(struct mmc_card *card) int i, ret, count; unsigned char pending; + /* + * Optimization, if there is only 1 function registered + * and IRQ:s are supported and currently enabled, then + * we can assume that this actually is an IRQ and we can + * call the registered IRQ handler directly without + * checking the CCCR registers. + */ + if ((card->host->caps & MMC_CAP_SDIO_IRQ) && + card->host->sdio_irqs && (card->sdio_funcs == 1)) { + struct sdio_func *func = card->sdio_func[0]; + 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", |