PKGBUILDs/core/linux-espressobin/0010-pci-aardvard-set-host-and-device-to-the-same-MAX-pay.patch

From dda187271721fbc30329d56fd68034c54e304a44 Mon Sep 17 00:00:00 2001
From: Victor Gu <xigu@marvell.com>
Date: Fri, 24 Mar 2017 20:52:30 +0800
Subject: [PATCH 10/11] pci: aardvard: set host and device to the same MAX
 payload size

Since the Aardvard does not implement PCIe root bus, the Linux PCIe
framework will not align the MAX payload size between host and device
for it.
This patch sets host and device to the same MAX payload size in Aardvard
PCIe driver.

Change-Id: I3979397b3af98911c067f7ad384922aa3f05497f
Signed-off-by: Victor Gu <xigu@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/37927
Tested-by: iSoC Platform CI <ykjenk@marvell.com>
Reviewed-by: Evan Wang <xswang@marvell.com>
---
 drivers/pci/host/pci-aardvark.c | 56 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/pci/host/pci-aardvark.c b/drivers/pci/host/pci-aardvark.c
index 10154dcf219b..0407c8cb89fb 100644
--- a/drivers/pci/host/pci-aardvark.c
+++ b/drivers/pci/host/pci-aardvark.c
@@ -32,6 +32,7 @@
 #define     PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ_SHIFT	5
 #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)
@@ -886,6 +887,58 @@ static int advk_pcie_parse_request_of_pci_ranges(struct advk_pcie *pcie)
 	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;
@@ -948,6 +1001,9 @@ static int advk_pcie_probe(struct platform_device *pdev)
 	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;
 }
-- 
2.13.3