linux-kernel - [PATCH 2/2] rcar-pcie: set host bridge's DMA mask

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Message-Id: <1483044304-2085-2-git-send-email-nikita.yoush@cogentembedded.com>
Date:   Thu, 29 Dec 2016 23:45:04 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        Simon Horman <horms@...ge.net.au>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Cc:     artemi.ivanov@...entembedded.com, linux-kernel@...r.kernel.org,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: [PATCH 2/2] rcar-pcie: set host bridge's DMA mask

This gives platform DMA mapping code a chance to disallow setting device
DMA mask to something that host bridge can't support.

Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
---
 drivers/pci/host/pcie-rcar.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index aca85be..b1edc3c 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -451,6 +451,7 @@ static int rcar_pcie_enable(struct rcar_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
 	struct pci_bus *bus, *child;
+	struct pci_host_bridge *bridge;
 	LIST_HEAD(res);
 
 	/* Try setting 5 GT/s link speed */
@@ -480,6 +481,10 @@ static int rcar_pcie_enable(struct rcar_pcie *pcie)
 	list_for_each_entry(child, &bus->children, node)
 		pcie_bus_configure_settings(child);
 
+	bridge = pci_find_host_bridge(bus);
+	bridge->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+	bridge->dev.dma_mask = &bridge->dev.coherent_dma_mask;
+
 	pci_bus_add_devices(bus);
 
 	return 0;
-- 
2.1.4