diff options
Diffstat (limited to 'target/linux/mvebu/patches-4.14/524-PCI-aardvark-set-host-and-device-to-the-same-MAX-payload-size.patch')
| -rw-r--r-- | target/linux/mvebu/patches-4.14/524-PCI-aardvark-set-host-and-device-to-the-same-MAX-payload-size.patch | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-4.14/524-PCI-aardvark-set-host-and-device-to-the-same-MAX-payload-size.patch b/target/linux/mvebu/patches-4.14/524-PCI-aardvark-set-host-and-device-to-the-same-MAX-payload-size.patch new file mode 100644 index 0000000000..f7e71aa060 --- /dev/null +++ b/target/linux/mvebu/patches-4.14/524-PCI-aardvark-set-host-and-device-to-the-same-MAX-payload-size.patch @@ -0,0 +1,137 @@ +From patchwork Thu Sep 28 12:58:34 2017 +Content-Type: text/plain; charset="utf-8" +MIME-Version: 1.0 +Content-Transfer-Encoding: 7bit +Subject: [v2, + 3/7] PCI: aardvark: set host and device to the same MAX payload size +X-Patchwork-Submitter: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +X-Patchwork-Id: 819587 +Message-Id: <20170928125838.11887-4-thomas.petazzoni@free-electrons.com> +To: Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org +Cc: Jason Cooper <jason@lakedaemon.net>, Andrew Lunn <andrew@lunn.ch>, + Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>, Gregory Clement + <gregory.clement@free-electrons.com>, + Nadav Haklai <nadavh@marvell.com>, Hanna Hawa <hannah@marvell.com>, + Yehuda Yitschak <yehuday@marvell.com>, + linux-arm-kernel@lists.infradead.org, Antoine Tenart + <antoine.tenart@free-electrons.com>, =?utf-8?q?Miqu=C3=A8l_Raynal?= + <miquel.raynal@free-electrons.com>, Victor Gu <xigu@marvell.com>, + Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +Date: Thu, 28 Sep 2017 14:58:34 +0200 +From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +List-Id: <linux-pci.vger.kernel.org> + +From: Victor Gu <xigu@marvell.com> + +Since the Aardvark does not implement a PCIe root bus, the Linux PCIe +subsystem will not align the MAX payload size between the host and the +device. This patch ensures that the host and device have the same MAX +payload size, fixing a number of problems with various PCIe devices. + +This is part of fixing bug +https://bugzilla.kernel.org/show_bug.cgi?id=196339, this commit was +reported as the user to be important to get a Intel 7260 mini-PCIe +WiFi card working. + +Fixes: Fixes: 8c39d710363c1 ("PCI: aardvark: Add Aardvark PCI host controller driver") +Signed-off-by: Victor Gu <xigu@marvell.com> +Reviewed-by: Evan Wang <xswang@marvell.com> +Reviewed-by: Nadav Haklai <nadavh@marvell.com> +[Thomas: tweak commit log.] +Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +--- + drivers/pci/host/pci-aardvark.c | 60 ++++++++++++++++++++++++++++++++++++++++- + 1 file changed, 59 insertions(+), 1 deletion(-) + +--- a/drivers/pci/host/pci-aardvark.c ++++ b/drivers/pci/host/pci-aardvark.c +@@ -30,8 +30,10 @@ + #define PCIE_CORE_DEV_CTRL_STATS_REG 0xc8 + #define PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE (0 << 4) + #define PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ_SHIFT 5 ++#define PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ 0x2 + #define PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE (0 << 11) + #define PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE_SHIFT 12 ++#define PCIE_CORE_MPS_UNIT_BYTE 128 + #define PCIE_CORE_LINK_CTRL_STAT_REG 0xd0 + #define PCIE_CORE_LINK_L0S_ENTRY BIT(0) + #define PCIE_CORE_LINK_TRAINING BIT(5) +@@ -297,7 +299,8 @@ static void advk_pcie_setup_hw(struct ad + + /* Set PCIe Device Control and Status 1 PF0 register */ + reg = PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE | +- (7 << PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ_SHIFT) | ++ (PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ << ++ PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ_SHIFT) | + PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE | + PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE_SHIFT; + advk_writel(pcie, reg, PCIE_CORE_DEV_CTRL_STATS_REG); +@@ -879,6 +882,58 @@ out_release_res: + return err; + } + ++static int advk_pcie_find_smpss(struct pci_dev *dev, void *data) ++{ ++ u8 *smpss = data; ++ ++ if (!dev) ++ return 0; ++ ++ if (!pci_is_pcie(dev)) ++ return 0; ++ ++ if (*smpss > dev->pcie_mpss) ++ *smpss = dev->pcie_mpss; ++ ++ return 0; ++} ++ ++static int advk_pcie_bus_configure_mps(struct pci_dev *dev, void *data) ++{ ++ int mps; ++ ++ if (!dev) ++ return 0; ++ ++ if (!pci_is_pcie(dev)) ++ return 0; ++ ++ mps = PCIE_CORE_MPS_UNIT_BYTE << *(u8 *)data; ++ pcie_set_mps(dev, mps); ++ ++ return 0; ++} ++ ++static void advk_pcie_configure_mps(struct pci_bus *bus, struct advk_pcie *pcie) ++{ ++ u8 smpss = PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ; ++ u32 reg; ++ ++ /* Find the minimal supported MAX payload size */ ++ advk_pcie_find_smpss(bus->self, &smpss); ++ pci_walk_bus(bus, advk_pcie_find_smpss, &smpss); ++ ++ /* Configure RC MAX payload size */ ++ reg = advk_readl(pcie, PCIE_CORE_DEV_CTRL_STATS_REG); ++ reg &= ~PCI_EXP_DEVCTL_PAYLOAD; ++ reg |= smpss << PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ_SHIFT; ++ advk_writel(pcie, reg, PCIE_CORE_DEV_CTRL_STATS_REG); ++ ++ /* Configure device MAX payload size */ ++ advk_pcie_bus_configure_mps(bus->self, &smpss); ++ pci_walk_bus(bus, advk_pcie_bus_configure_mps, &smpss); ++} ++ + static int advk_pcie_probe(struct platform_device *pdev) + { + struct device *dev = &pdev->dev; +@@ -952,6 +1007,9 @@ static int advk_pcie_probe(struct platfo + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + ++ /* Configure the MAX pay load size */ ++ advk_pcie_configure_mps(bus, pcie); ++ + pci_bus_add_devices(bus); + return 0; + } |