linux-kernel - [PATCH 3/3] PCI: keystone: Set DMA mask and coherent DMA mask

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Date:   Wed, 10 Nov 2021 13:03:43 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: [PATCH 3/3] PCI: keystone: Set DMA mask and coherent DMA mask

Set DMA mask and coherent DMA mask such to indicate the device
can address the entire address space (32-bit in the case of
K2G and 48-bit in the case of AM654).

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/pci/controller/dwc/pci-keystone.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 6a352528d971..23649c01fe41 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -1203,6 +1203,12 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48)) &&
+	    dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
+		dev_err(dev, "Cannot set DMA mask\n");
+		return -EINVAL;
+	}
+
 	ret = of_property_read_u32(np, "num-lanes", &num_lanes);
 	if (ret)
 		num_lanes = 1;
-- 
2.17.1