diff options
Diffstat (limited to 'target/linux/mediatek/patches-5.15/710-pci-pcie-mediatek-add-support-for-coherent-DMA.patch')
| -rw-r--r-- | target/linux/mediatek/patches-5.15/710-pci-pcie-mediatek-add-support-for-coherent-DMA.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-5.15/710-pci-pcie-mediatek-add-support-for-coherent-DMA.patch b/target/linux/mediatek/patches-5.15/710-pci-pcie-mediatek-add-support-for-coherent-DMA.patch new file mode 100644 index 0000000000..571a5f7d48 --- /dev/null +++ b/target/linux/mediatek/patches-5.15/710-pci-pcie-mediatek-add-support-for-coherent-DMA.patch @@ -0,0 +1,82 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Fri, 4 Sep 2020 18:42:42 +0200 +Subject: [PATCH] pci: pcie-mediatek: add support for coherent DMA + +It improves performance by eliminating the need for a cache flush for DMA on +attached devices + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + +--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi ++++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi +@@ -830,6 +830,9 @@ + bus-range = <0x00 0xff>; + ranges = <0x82000000 0 0x20000000 0x0 0x20000000 0 0x8000000>; + status = "disabled"; ++ dma-coherent; ++ mediatek,hifsys = <&hifsys>; ++ mediatek,cci-control = <&cci_control2>; + + #interrupt-cells = <1>; + interrupt-map-mask = <0 0 0 7>; +@@ -874,6 +877,9 @@ + bus-range = <0x00 0xff>; + ranges = <0x82000000 0 0x28000000 0x0 0x28000000 0 0x8000000>; + status = "disabled"; ++ dma-coherent; ++ mediatek,hifsys = <&hifsys>; ++ mediatek,cci-control = <&cci_control2>; + + #interrupt-cells = <1>; + interrupt-map-mask = <0 0 0 7>; +--- a/drivers/pci/controller/pcie-mediatek.c ++++ b/drivers/pci/controller/pcie-mediatek.c +@@ -20,6 +20,7 @@ + #include <linux/of_address.h> + #include <linux/of_pci.h> + #include <linux/of_platform.h> ++#include <linux/of_address.h> + #include <linux/pci.h> + #include <linux/phy/phy.h> + #include <linux/platform_device.h> +@@ -139,6 +140,11 @@ + #define PCIE_LINK_STATUS_V2 0x804 + #define PCIE_PORT_LINKUP_V2 BIT(10) + ++/* DMA channel mapping */ ++#define HIFSYS_DMA_AG_MAP 0x008 ++#define HIFSYS_DMA_AG_MAP_PCIE0 BIT(0) ++#define HIFSYS_DMA_AG_MAP_PCIE1 BIT(1) ++ + struct mtk_pcie_port; + + /** +@@ -1053,6 +1059,27 @@ static int mtk_pcie_setup(struct mtk_pci + struct mtk_pcie_port *port, *tmp; + int err, slot; + ++ if (of_dma_is_coherent(node)) { ++ struct regmap *con; ++ u32 mask; ++ ++ con = syscon_regmap_lookup_by_phandle(node, ++ "mediatek,cci-control"); ++ /* enable CPU/bus coherency */ ++ if (!IS_ERR(con)) ++ regmap_write(con, 0, 3); ++ ++ con = syscon_regmap_lookup_by_phandle(node, ++ "mediatek,hifsys"); ++ if (IS_ERR(con)) { ++ dev_err(dev, "missing hifsys node\n"); ++ return PTR_ERR(con); ++ } ++ ++ mask = HIFSYS_DMA_AG_MAP_PCIE0 | HIFSYS_DMA_AG_MAP_PCIE1; ++ regmap_update_bits(con, HIFSYS_DMA_AG_MAP, mask, mask); ++ } ++ + slot = of_get_pci_domain_nr(dev->of_node); + if (slot < 0) { + for_each_available_child_of_node(node, child) { |