diff options
| author | Richard Zhu <r65037@freescale.com> | 2010-05-06 16:03:36 +0800 |
|---|---|---|
| committer | Justin Waters <justin.waters@timesys.com> | 2010-12-17 12:10:24 -0500 |
| commit | 7838680665f5044905fa968d363a420d67ab6188 (patch) | |
| tree | 041be3153d9a651a5d7fdab7ef6178cd4f36799c | |
| parent | c22d4f8467547ee6ef553b1866214dc69ac33c4f (diff) | |
ENGR00123128 MX25 wifi small data transfer error in DMA mode
Use the DMA mode in normal, and revert to PIO mode when
there are small data transmissions.
Signed-off-by: Richard Zhu <r65037@freescale.com>
| -rw-r--r-- | drivers/mmc/host/mx_sdhci.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/mmc/host/mx_sdhci.c b/drivers/mmc/host/mx_sdhci.c index ff735524e6a1..229210dd0d0a 100644 --- a/drivers/mmc/host/mx_sdhci.c +++ b/drivers/mmc/host/mx_sdhci.c @@ -505,6 +505,30 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data) host->flags &= ~SDHCI_REQ_USE_DMA; } + if (cpu_is_mx25() && (data->blksz * data->blocks < 0x10)) { + host->flags &= ~SDHCI_REQ_USE_DMA; + DBG("Reverting to PIO in small data transfer.\n"); + writel(readl(host->ioaddr + SDHCI_INT_ENABLE) + | SDHCI_INT_DATA_AVAIL + | SDHCI_INT_SPACE_AVAIL, + host->ioaddr + SDHCI_INT_ENABLE); + writel(readl(host->ioaddr + SDHCI_SIGNAL_ENABLE) + | SDHCI_INT_DATA_AVAIL + | SDHCI_INT_SPACE_AVAIL, + host->ioaddr + SDHCI_SIGNAL_ENABLE); + } else if (cpu_is_mx25() && (host->flags & SDHCI_USE_DMA)) { + host->flags |= SDHCI_REQ_USE_DMA; + DBG("Reverting to DMA in large data transfer.\n"); + writel(readl(host->ioaddr + SDHCI_INT_ENABLE) + & ~(SDHCI_INT_DATA_AVAIL + | SDHCI_INT_SPACE_AVAIL), + host->ioaddr + SDHCI_INT_ENABLE); + writel(readl(host->ioaddr + SDHCI_SIGNAL_ENABLE) + & ~(SDHCI_INT_DATA_AVAIL + | SDHCI_INT_SPACE_AVAIL), + host->ioaddr + SDHCI_SIGNAL_ENABLE); + } + if (host->flags & SDHCI_REQ_USE_DMA) { int i; struct scatterlist *tsg; @@ -694,7 +718,7 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) mode |= SDHCI_TRNS_READ; else mode &= ~SDHCI_TRNS_READ; - if (host->flags & SDHCI_USE_DMA) + if (host->flags & SDHCI_REQ_USE_DMA) mode |= SDHCI_TRNS_DMA; if (host->flags & SDHCI_USE_EXTERNAL_DMA) DBG("Prepare data completely in %s transfer mode.\n", |