diff options
| author | Gilad Ben-Yossef <gilad@benyossef.com> | 2017-11-02 11:10:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-06 18:46:03 +0300 |
| commit | 414a48e88d9a840ba110e4ade938236216cf06bf (patch) | |
| tree | 2001755cf9a3ae8a533b83e8331ab68799a091aa /drivers | |
| parent | e7cdcba451b3ddd68e714875be13e782577c9e4a (diff) | |
| download | linux-414a48e88d9a840ba110e4ade938236216cf06bf.tar.xz | |
staging: ccree: handle limiting of DMA masks
Properly handle limiting of DMA masks based on device and bus
capabilities.
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/ccree/ssi_driver.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c index 5f03c2596f45..1d4c7bb78884 100644 --- a/drivers/staging/ccree/ssi_driver.c +++ b/drivers/staging/ccree/ssi_driver.c @@ -208,6 +208,7 @@ static int init_cc_resources(struct platform_device *plat_dev) struct device *dev = &plat_dev->dev; struct device_node *np = dev->of_node; u32 signature_val; + dma_addr_t dma_mask; int rc = 0; new_drvdata = devm_kzalloc(dev, sizeof(*new_drvdata), GFP_KERNEL); @@ -256,15 +257,29 @@ static int init_cc_resources(struct platform_device *plat_dev) } dev_dbg(dev, "Registered to IRQ: %d\n", new_drvdata->irq); + if (!plat_dev->dev.dma_mask) + plat_dev->dev.dma_mask = &plat_dev->dev.coherent_dma_mask; + + dma_mask = (dma_addr_t)(DMA_BIT_MASK(DMA_BIT_MASK_LEN)); + while (dma_mask > 0x7fffffffUL) { + if (dma_supported(&plat_dev->dev, dma_mask)) { + rc = dma_set_coherent_mask(&plat_dev->dev, dma_mask); + if (!rc) + break; + } + dma_mask >>= 1; + } + + if (rc) { + dev_err(dev, "Error: failed in dma_set_mask, mask=%par\n", + &dma_mask); + goto post_drvdata_err; + } + rc = cc_clk_on(new_drvdata); if (rc) goto post_drvdata_err; - if (!dev->dma_mask) - dev->dma_mask = &dev->coherent_dma_mask; - - if (!dev->coherent_dma_mask) - dev->coherent_dma_mask = DMA_BIT_MASK(DMA_BIT_MASK_LEN); /* Verify correct mapping */ signature_val = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_SIGNATURE)); |