openwrt/target/linux/mvebu/patches-4.14/524-PCI-aardvark-set-host-and-device-to-the-same-MAX-payload-size.patch

From patchwork Thu Sep 28 12:58:34 2017
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Subject: [v2,
 3/7] PCI: aardvark: set host and device to the same MAX payload size
X-Patchwork-Submitter: Thomas Petazzoni <[email protected]>
X-Patchwork-Id: 819587
Message-Id: <[email protected]>
To: Bjorn Helgaas <[email protected]>, [email protected]
Cc: Jason Cooper <[email protected]>, Andrew Lunn <[email protected]>,
 Sebastian Hesselbarth <[email protected]>, Gregory Clement
 <[email protected]>, 
 Nadav Haklai <[email protected]>, Hanna Hawa <[email protected]>,
 Yehuda Yitschak <[email protected]>,
 [email protected], Antoine Tenart
 <[email protected]>, =?utf-8?q?Miqu=C3=A8l_Raynal?=
 <[email protected]>, Victor Gu <[email protected]>,
 Thomas Petazzoni <[email protected]>
Date: Thu, 28 Sep 2017 14:58:34 +0200
From: Thomas Petazzoni <[email protected]>
List-Id: <linux-pci.vger.kernel.org>

From: Victor Gu <[email protected]>

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 <[email protected]>
Reviewed-by: Evan Wang <[email protected]>
Reviewed-by: Nadav Haklai <[email protected]>
[Thomas: tweak commit log.]
Signed-off-by: Thomas Petazzoni <[email protected]>
---
 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
@@ -30,9 +30,11 @@
 #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_DEV_CTRL_STATS_MAX_RD_REQ_SZ		0x2
+#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_SZ <<
 		 PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE_SHIFT);
@@ -886,6 +889,58 @@ 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;
@@ -959,6 +1014,9 @@ 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;
 }