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| author | Alexandre Courbot <acourbot@nvidia.com> | 2016-03-07 11:07:55 +0900 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-03-18 09:11:11 +0100 |
| commit | 7b91369b46559dcc90e8d414e31c0257972e0cbb (patch) | |
| tree | 1deda3d88f97da83125c2c84167e2b3aef9f7dd1 | |
| parent | 83c742c344c08c2bbe338d45c6ec63110e9d5e3d (diff) | |
| download | talos-obmc-linux-7b91369b46559dcc90e8d414e31c0257972e0cbb.tar.gz talos-obmc-linux-7b91369b46559dcc90e8d414e31c0257972e0cbb.zip | |
mmc: sdhci: Set DMA mask when adding host
Set the DMA mask in sdhci_add_host() after we determined the
capabilities of the device. 64-bit devices in particular are given the
proper mask that ensures bounce buffers are not used.
Also disable DMA if no proper DMA mask can be set, as the DMA-API
documentation specifies.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 48 |
1 files changed, 41 insertions, 7 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 4ae394e9e560..8670f162dec7 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2804,6 +2804,36 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev, EXPORT_SYMBOL_GPL(sdhci_alloc_host); +static int sdhci_set_dma_mask(struct sdhci_host *host) +{ + struct mmc_host *mmc = host->mmc; + struct device *dev = mmc_dev(mmc); + int ret = -EINVAL; + + if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA) + host->flags &= ~SDHCI_USE_64_BIT_DMA; + + /* Try 64-bit mask if hardware is capable of it */ + if (host->flags & SDHCI_USE_64_BIT_DMA) { + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)); + if (ret) { + pr_warn("%s: Failed to set 64-bit DMA mask.\n", + mmc_hostname(mmc)); + host->flags &= ~SDHCI_USE_64_BIT_DMA; + } + } + + /* 32-bit mask as default & fallback */ + if (ret) { + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) + pr_warn("%s: Failed to set 32-bit DMA mask.\n", + mmc_hostname(mmc)); + } + + return ret; +} + int sdhci_add_host(struct sdhci_host *host) { struct mmc_host *mmc; @@ -2879,13 +2909,17 @@ int sdhci_add_host(struct sdhci_host *host) host->flags |= SDHCI_USE_64_BIT_DMA; if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { - if (host->ops->enable_dma) { - if (host->ops->enable_dma(host)) { - pr_warn("%s: No suitable DMA available - falling back to PIO\n", - mmc_hostname(mmc)); - host->flags &= - ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); - } + ret = sdhci_set_dma_mask(host); + + if (!ret && host->ops->enable_dma) + ret = host->ops->enable_dma(host); + + if (ret) { + pr_warn("%s: No suitable DMA available - falling back to PIO\n", + mmc_hostname(mmc)); + host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); + + ret = 0; } } |
