Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755208Ab1ECUvr (ORCPT ); Tue, 3 May 2011 16:51:47 -0400 Received: from mail-ey0-f174.google.com ([209.85.215.174]:34599 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754962Ab1ECUvq (ORCPT ); Tue, 3 May 2011 16:51:46 -0400 From: Per Forlin To: linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linaro-dev@lists.linaro.org Cc: Chris Ball , Stefan Nilsson XK , Per Forlin Subject: [PATCH resend] sdio: optimized SDIO IRQ handling for single function Date: Tue, 3 May 2011 22:51:21 +0200 Message-Id: <1304455881-10010-1-git-send-email-per.forlin@linaro.org> X-Mailer: git-send-email 1.7.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1558 Lines: 45 From: Stefan Nilsson XK 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 Signed-off-by: Per Forlin --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/