From 6aa943ab8994fe6e4ccba22c5bc8150a84268bdd Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Tue, 17 Mar 2009 00:13:50 +0300 Subject: sdhci: Enable only relevant (DMA/PIO) interrupts during transfers 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 Signed-off-by: Pierre Ossman --- drivers/mmc/host/sdhci.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index bd5acfb0c1b8..6fbbc005dd7f 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -167,9 +167,7 @@ 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) @@ -603,6 +601,17 @@ 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; @@ -751,6 +760,8 @@ 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); -- cgit v1.2.3