From: Stefan Nilsson XK <stefan.xk.nilsson@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Per Forlin <per.forlin@xxxxxxxxxx>
---
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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