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mmc: sdhci-acpi: Add 64-bit DMA support 

Set the DMA mask during the first call to ->enable_dma() to
make use of the SDHCI_USE_64_BIT_DMA flag.

This patch is dependent on
commit 8a2f38ddfe ("ACPI / platform: provide default DMA mask")
which provides the dev->dma_mask pointer without
which dma_set_mask_and_coherent() will always fail.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2014-11-04 12:42:47 +02:00 committed by Ulf Hansson
parent e57a5f61ea
commit 4f64f84348
1 changed files with 24 additions and 16 deletions
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40
drivers/mmc/host/sdhci-acpi.c
View File

@ -76,6 +76,7 @@ struct sdhci_acpi_host {
const struct sdhci_acpi_slot *slot;
struct platform_device *pdev;
bool use_runtime_pm;
bool dma_setup;
};
static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
@ -85,7 +86,29 @@ static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
static int sdhci_acpi_enable_dma(struct sdhci_host *host)
{
return 0;
struct sdhci_acpi_host *c = sdhci_priv(host);
struct device *dev = &c->pdev->dev;
int err = -1;
if (c->dma_setup)
return 0;
if (host->flags & SDHCI_USE_64_BIT_DMA) {
if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA) {
host->flags &= ~SDHCI_USE_64_BIT_DMA;
} else {
err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
if (err)
dev_warn(dev, "Failed to set 64-bit DMA mask\n");
}
}
if (err)
err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
c->dma_setup = !err;
return err;
}
static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
@ -305,21 +328,6 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
goto err_free;
}
if (!dev->dma_mask) {
u64 dma_mask;
if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
/* 64-bit DMA is not supported at present */
dma_mask = DMA_BIT_MASK(32);
} else {
dma_mask = DMA_BIT_MASK(32);
}
err = dma_coerce_mask_and_coherent(dev, dma_mask);
if (err)
goto err_free;
}
if (c->slot) {
if (c->slot->probe_slot) {
err = c->slot->probe_slot(pdev, hid, uid);