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mmc: atmel-mci: don't use dma features when using DMA with no chan available

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Some callbacks are set too early -- i.e. we can have dma capabilities but
we can't get a dma channel. So wait to get the dma channel before setting
callbacks and change logs consequently.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
[Should be applied to 3.2-stable.]
Cc: <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ludovic Desroches 2012-02-09 16:33:53 +01:00 committed by Chris Ball
parent 2273d5ccb8
commit ef8781989a
1 changed files with 10 additions and 11 deletions
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21
drivers/mmc/host/atmel-mci.c
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@ -1948,12 +1948,12 @@ static bool atmci_filter(struct dma_chan *chan, void *slave)
}
}
static void atmci_configure_dma(struct atmel_mci *host)
static bool atmci_configure_dma(struct atmel_mci *host)
{
struct mci_platform_data *pdata;
if (host == NULL)
return;
return false;
pdata = host->pdev->dev.platform_data;
@ -1970,12 +1970,15 @@ static void atmci_configure_dma(struct atmel_mci *host)
host->dma.chan =
dma_request_channel(mask, atmci_filter, pdata->dma_slave);
}
if (!host->dma.chan)
dev_notice(&host->pdev->dev, "DMA not available, using PIO\n");
else
if (!host->dma.chan) {
dev_warn(&host->pdev->dev, "no DMA channel available\n");
return false;
} else {
dev_info(&host->pdev->dev,
"Using %s for DMA transfers\n",
dma_chan_name(host->dma.chan));
return true;
}
}
static inline unsigned int atmci_get_version(struct atmel_mci *host)
@ -2085,8 +2088,7 @@ static int __init atmci_probe(struct platform_device *pdev)
/* Get MCI capabilities and set operations according to it */
atmci_get_cap(host);
if (host->caps.has_dma) {
dev_info(&pdev->dev, "using DMA\n");
if (host->caps.has_dma && atmci_configure_dma(host)) {
host->prepare_data = &atmci_prepare_data_dma;
host->submit_data = &atmci_submit_data_dma;
host->stop_transfer = &atmci_stop_transfer_dma;
@ -2096,15 +2098,12 @@ static int __init atmci_probe(struct platform_device *pdev)
host->submit_data = &atmci_submit_data_pdc;
host->stop_transfer = &atmci_stop_transfer_pdc;
} else {
dev_info(&pdev->dev, "no DMA, no PDC\n");
dev_info(&pdev->dev, "using PIO\n");
host->prepare_data = &atmci_prepare_data;
host->submit_data = &atmci_submit_data;
host->stop_transfer = &atmci_stop_transfer;
}
if (host->caps.has_dma)
atmci_configure_dma(host);
platform_set_drvdata(pdev, host);
/* We need at least one slot to succeed */