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8607372b41
The patch "710-pci-pcie-mediatek-add-support-for-coherent-DMA.patch"
makes use of "syscon_regmap_lookup_by_phandle" which requires that
"syscon" be in the compatible list.
Without this patch, PCIe probe will fail with the following error:
[ 1.287467] mtk-pcie 1a143000.pcie: host bridge /pcie@1a143000 ranges:
[ 1.294019] mtk-pcie 1a143000.pcie: Parsing ranges property...
[ 1.299901] mtk-pcie 1a143000.pcie: MEM 0x0020000000..0x0027ffffff -> 0x0020000000
[ 1.307954] mtk-pcie 1a143000.pcie: missing hifsys node
[ 1.313185] mtk-pcie: probe of 1a143000.pcie failed with error -22
Fixes: 4c6e9a9943 ("kernel: bump 6.6 to 6.6.30")
Signed-off-by: Rany Hany <rany_hany@riseup.net>
92 lines
2.5 KiB
Diff
92 lines
2.5 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 4 Sep 2020 18:42:42 +0200
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Subject: [PATCH] pci: pcie-mediatek: add support for coherent DMA
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It improves performance by eliminating the need for a cache flush for DMA on
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attached devices
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
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+++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
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@@ -832,6 +832,9 @@
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bus-range = <0x00 0xff>;
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ranges = <0x82000000 0 0x20000000 0x0 0x20000000 0 0x8000000>;
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status = "disabled";
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+ dma-coherent;
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+ mediatek,hifsys = <&hifsys>;
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+ mediatek,cci-control = <&cci_control2>;
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#interrupt-cells = <1>;
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interrupt-map-mask = <0 0 0 7>;
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@@ -876,6 +879,9 @@
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bus-range = <0x00 0xff>;
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ranges = <0x82000000 0 0x28000000 0x0 0x28000000 0 0x8000000>;
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status = "disabled";
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+ dma-coherent;
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+ mediatek,hifsys = <&hifsys>;
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+ mediatek,cci-control = <&cci_control2>;
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#interrupt-cells = <1>;
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interrupt-map-mask = <0 0 0 7>;
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@@ -937,7 +943,7 @@
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};
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hifsys: clock-controller@1af00000 {
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- compatible = "mediatek,mt7622-hifsys";
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+ compatible = "mediatek,mt7622-hifsys", "syscon";
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reg = <0 0x1af00000 0 0x70>;
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#clock-cells = <1>;
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};
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--- a/drivers/pci/controller/pcie-mediatek.c
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+++ b/drivers/pci/controller/pcie-mediatek.c
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@@ -20,6 +20,7 @@
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/of_platform.h>
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+#include <linux/of_address.h>
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#include <linux/pci.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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@@ -139,6 +140,11 @@
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#define PCIE_LINK_STATUS_V2 0x804
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#define PCIE_PORT_LINKUP_V2 BIT(10)
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+/* DMA channel mapping */
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+#define HIFSYS_DMA_AG_MAP 0x008
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+#define HIFSYS_DMA_AG_MAP_PCIE0 BIT(0)
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+#define HIFSYS_DMA_AG_MAP_PCIE1 BIT(1)
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+
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struct mtk_pcie_port;
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/**
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@@ -1060,6 +1066,27 @@ static int mtk_pcie_setup(struct mtk_pci
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struct mtk_pcie_port *port, *tmp;
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int err, slot;
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+ if (of_dma_is_coherent(node)) {
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+ struct regmap *con;
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+ u32 mask;
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+
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+ con = syscon_regmap_lookup_by_phandle(node,
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+ "mediatek,cci-control");
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+ /* enable CPU/bus coherency */
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+ if (!IS_ERR(con))
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+ regmap_write(con, 0, 3);
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+
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+ con = syscon_regmap_lookup_by_phandle(node,
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+ "mediatek,hifsys");
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+ if (IS_ERR(con)) {
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+ dev_err(dev, "missing hifsys node\n");
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+ return PTR_ERR(con);
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+ }
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+
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+ mask = HIFSYS_DMA_AG_MAP_PCIE0 | HIFSYS_DMA_AG_MAP_PCIE1;
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+ regmap_update_bits(con, HIFSYS_DMA_AG_MAP, mask, mask);
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+ }
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+
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slot = of_get_pci_domain_nr(dev->of_node);
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if (slot < 0) {
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for_each_available_child_of_node(node, child) {
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