From 414a48e88d9a840ba110e4ade938236216cf06bf Mon Sep 17 00:00:00 2001 From: Gilad Ben-Yossef Date: Thu, 2 Nov 2017 08:10:22 +0000 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/staging/ccree/ssi_driver.c | 25 ++++++++++++++++++++----- 1 file 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)); -- 2.45.2