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Commit eaa35b53 authored by Yuanyuan Liu's avatar Yuanyuan Liu
Browse files

cnss2: Enable IO coherency 



Enable IO coherency to improve WLAN performance.

CRs-Fixed: 2515504
Change-Id: I65ed78258cdf0ef93393bc7eee6bba0c929aad87
Signed-off-by: default avatarYuanyuan Liu <yuanliu@codeaurora.org>
parent dabca6e5

drivers/net/wireless/cnss2/pci.c

+16 −2
Original line number Diff line number Diff line
@@ -2898,6 +2898,10 @@ int cnss_smmu_map(struct device *dev, 
	unsigned long iova;

	size_t len;

	int ret = 0;

	int flag = IOMMU_READ | IOMMU_WRITE;

	struct pci_dev *root_port;

	struct device_node *root_of_node;

	bool dma_coherent = false;



	if (!pci_priv)

		return -ENODEV;
@@ -2920,9 +2924,19 @@ int cnss_smmu_map(struct device *dev, 
		return -ENOMEM;

	}



	root_port = pci_find_pcie_root_port(pci_priv->pci_dev);

	root_of_node = root_port->dev.of_node;

	if (root_of_node->parent) {

		dma_coherent = of_property_read_bool(root_of_node->parent,

						     "dma-coherent");

		cnss_pr_dbg("dma-coherent is %s\n",

			    dma_coherent ? "enabled" : "disabled");

		if (dma_coherent)

			flag |= IOMMU_CACHE;

	}



	ret = iommu_map(pci_priv->iommu_domain, iova,

			rounddown(paddr, PAGE_SIZE), len,

			IOMMU_READ | IOMMU_WRITE);

			rounddown(paddr, PAGE_SIZE), len, flag);

	if (ret) {

		cnss_pr_err("PA to IOVA mapping failed, ret %d\n", ret);

		return ret;