From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from buildserver.ru.mvista.com (unknown [85.21.88.6]) by ozlabs.org (Postfix) with ESMTP id 4C33BDDEE9 for ; Sat, 21 Feb 2009 04:33:26 +1100 (EST) Date: Fri, 20 Feb 2009 20:33:15 +0300 From: Anton Vorontsov To: Pierre Ossman Subject: [PATCH 04/13] sdhci: Enable only relevant (DMA/PIO) interrupts during transfers Message-ID: <20090220173315.GD7583@oksana.dev.rtsoft.ru> References: <20090220173228.GA5091@oksana.dev.rtsoft.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1251 In-Reply-To: <20090220173228.GA5091@oksana.dev.rtsoft.ru> Cc: Ben Dooks , Arnd Bergmann , Liu Dave , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, sdhci-devel@list.drzeus.cx List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Some hosts (that is, FSL eSDHC) throw PIO interrupts during DMA transfers, this causes tons of unneeded interrupts, and thus highly degraded speed. This patch modifies the driver so that now we only enable relevant (DMA or PIO) interrupts during transfers. Signed-off-by: Anton Vorontsov --- drivers/mmc/host/sdhci.c | 17 ++++++++++++++--- 1 files changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index fadaeb8..2728e90 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -222,9 +222,7 @@ static void sdhci_init(struct sdhci_host *host) SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT | - SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL | - SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE | - SDHCI_INT_ADMA_ERROR); + SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE); } static void sdhci_reinit(struct sdhci_host *host) @@ -658,6 +656,17 @@ static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data) return count; } +static void sdhci_set_transfer_irqs(struct sdhci_host *host) +{ + u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL; + u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR; + + if (host->flags & SDHCI_REQ_USE_DMA) + sdhci_clear_set_irqs(host, pio_irqs, dma_irqs); + else + sdhci_clear_set_irqs(host, dma_irqs, pio_irqs); +} + static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data) { u8 count; @@ -806,6 +815,8 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data) host->blocks = data->blocks; } + sdhci_set_transfer_irqs(host); + /* We do not handle DMA boundaries, so set it to max (512 KiB) */ sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, data->blksz), SDHCI_BLOCK_SIZE); sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT); -- 1.5.6.5