ramips: mt7621: backport more pcie driver fixes

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

2 files changed, 222 insertions, 0 deletions

diff --git a/target/linux/ramips/patches-5.4/0120-staging-mt7621-pci-properly-power-off-dual-ported-pc.patch b/target/linux/ramips/patches-5.4/0120-staging-mt7621-pci-properly-power-off-dual-ported-pc.patch
new file mode 100644
index 0000000000..9efcb8011a
--- /dev/null
+++ b/target/linux/ramips/patches-5.4/0120-staging-mt7621-pci-properly-power-off-dual-ported-pc.patch
@@ -0,0 +1,65 @@
+From 5fcded5e857cf66c9592e4be28c4dab4520c9177 Mon Sep 17 00:00:00 2001
+From: Sergio Paracuellos <sergio.paracuellos@gmail.com>
+Date: Thu, 9 Apr 2020 13:16:52 +0200
+Subject: [PATCH] staging: mt7621-pci: properly power off dual-ported pcie phy
+
+Pcie phy for pcie0 and pcie1 is shared using a dual ported
+one. Current code was assuming that if nothing is connected
+in pcie0 it won't be also nothing connected in pcie1. This
+assumtion is wrong for some devices such us 'Mikrotik rbm33g'
+and 'ZyXEL LTE3301-PLUS' where only connecting a card to the
+second bus on the phy is possible. For such devices kernel
+hangs in the same point because of the wrong poweroff of the
+phy getting the following trace:
+
+mt7621-pci-phy 1e149000.pcie-phy: PHY for 0xbe149000 (dual port = 1)
+mt7621-pci-phy 1e14a000.pcie-phy: PHY for 0xbe14a000 (dual port = 0)
+mt7621-pci-phy 1e149000.pcie-phy: Xtal is 40MHz
+mt7621-pci-phy 1e14a000.pcie-phy: Xtal is 40MHz
+mt7621-pci 1e140000.pcie: pcie0 no card, disable it (RST & CLK)
+[hangs]
+
+The wrong assumption is located in the 'mt7621_pcie_init_ports'
+function where we are just making a power off of the phy for
+slots 0 and 2 if nothing is connected in them. Hence, only
+poweroff the phy if nothing is connected in both slot 0 and
+slot 1 avoiding the kernel to hang.
+
+Fixes: 5737cfe87a9c ("staging: mt7621-pci: avoid to poweroff the phy for slot one")
+Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
+Link: https://lore.kernel.org/r/20200409111652.30964-1-sergio.paracuellos@gmail.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/staging/mt7621-pci/pci-mt7621.c | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+--- a/drivers/staging/mt7621-pci/pci-mt7621.c
++++ b/drivers/staging/mt7621-pci/pci-mt7621.c
+@@ -502,17 +502,25 @@ static void mt7621_pcie_init_ports(struc
+ 
+ 	mt7621_pcie_reset_ep_deassert(pcie);
+ 
++	tmp = NULL;
+ 	list_for_each_entry(port, &pcie->ports, list) {
+ 		u32 slot = port->slot;
+ 
+ 		if (!mt7621_pcie_port_is_linkup(port)) {
+ 			dev_err(dev, "pcie%d no card, disable it (RST & CLK)\n",
+ 				slot);
+-			if (slot != 1)
+-				phy_power_off(port->phy);
+ 			mt7621_control_assert(port);
+ 			mt7621_pcie_port_clk_disable(port);
+ 			port->enabled = false;
++
++			if (slot == 0) {
++				tmp = port;
++				continue;
++			}
++
++			if (slot == 1 && tmp && !tmp->enabled)
++				phy_power_off(tmp->phy);
++
+ 		}
+ 	}
+ }
diff --git a/target/linux/ramips/patches-5.4/0121-staging-mt7621-pci-fix-PCIe-interrupt-mapping.patch b/target/linux/ramips/patches-5.4/0121-staging-mt7621-pci-fix-PCIe-interrupt-mapping.patch
new file mode 100644
index 0000000000..68de6df2db
--- /dev/null
+++ b/target/linux/ramips/patches-5.4/0121-staging-mt7621-pci-fix-PCIe-interrupt-mapping.patch
@@ -0,0 +1,157 @@
+From fab6710e4c51f4eb622f95a08322ab5fdbe3f295 Mon Sep 17 00:00:00 2001
+From: Sergio Paracuellos <sergio.paracuellos@gmail.com>
+Date: Mon, 13 Apr 2020 07:59:42 +0200
+Subject: [PATCH] staging: mt7621-pci: fix PCIe interrupt mapping
+
+MT7621 has three assigned interrupts for the pcie. This
+interrupts should properly being mapped taking into account
+which devices are finally connected in which bus according
+to link status. So the irq mappings should be as follows
+according to link status (three bits indicating which devices
+are link up):
+
+* For PCIe Bus 1 slot 0:
+  - status = 0x2 || status = 0x6 => IRQ = pcie1_irq (24).
+  - status = 0x4 => IRQ = pcie2_irq (25).
+  - default => IRQ = pcie0_irq (23).
+* For PCIe Bus 2 slot 0:
+  - status = 0x5 || status = 0x6 => IRQ = pcie2_irq (25).
+  - default => IRQ = pcie1_irq (24).
+* For PCIe Bus 2 slot 1:
+  - status = 0x5 || status = 0x6 => IRQ = pcie2_irq (25).
+  - default => IRQ = pcie1_irq (24).
+* For PCIe Bus 3 any slot:
+  - default => IRQ = pcie2_irq (25).
+
+Because of this, the function 'of_irq_parse_and_map_pci' cannot
+be used and we need to change device tree information from using
+the 'interrupt-map' and 'interrupt-map-mask' properties into an
+'interrupts' property to be able to get irq information from the
+ports using the 'platform_get_irq' and storing an 'irq-map' into
+the pcie driver data node to properly map correct irq using a
+new 'mt7621_map_irq' function where this map will be read and the
+correct irq returned.
+
+Fixes: 46d093124df4 ("staging: mt7621-pci: improve interrupt mapping")
+Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
+Link: https://lore.kernel.org/r/20200413055942.2714-1-sergio.paracuellos@gmail.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/staging/mt7621-dts/mt7621.dtsi  |  9 +++----
+ drivers/staging/mt7621-pci/pci-mt7621.c | 36 +++++++++++++++++++++++--
+ 2 files changed, 38 insertions(+), 7 deletions(-)
+
+--- a/drivers/staging/mt7621-pci/pci-mt7621.c
++++ b/drivers/staging/mt7621-pci/pci-mt7621.c
+@@ -97,6 +97,7 @@
+  * @pcie_rst: pointer to port reset control
+  * @gpio_rst: gpio reset
+  * @slot: port slot
++ * @irq: GIC irq
+  * @enabled: indicates if port is enabled
+  */
+ struct mt7621_pcie_port {
+@@ -107,6 +108,7 @@ struct mt7621_pcie_port {
+ 	struct reset_control *pcie_rst;
+ 	struct gpio_desc *gpio_rst;
+ 	u32 slot;
++	int irq;
+ 	bool enabled;
+ };
+ 
+@@ -120,6 +122,7 @@ struct mt7621_pcie_port {
+  * @dev: Pointer to PCIe device
+  * @io_map_base: virtual memory base address for io
+  * @ports: pointer to PCIe port information
++ * @irq_map: irq mapping info according pcie link status
+  * @resets_inverted: depends on chip revision
+  * reset lines are inverted.
+  */
+@@ -135,6 +138,7 @@ struct mt7621_pcie {
+ 	} offset;
+ 	unsigned long io_map_base;
+ 	struct list_head ports;
++	int irq_map[PCIE_P2P_MAX];
+ 	bool resets_inverted;
+ };
+ 
+@@ -279,6 +283,16 @@ static void setup_cm_memory_region(struc
+ 	}
+ }
+ 
++static int mt7621_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
++{
++	struct mt7621_pcie *pcie = pdev->bus->sysdata;
++	struct device *dev = pcie->dev;
++	int irq = pcie->irq_map[slot];
++
++	dev_info(dev, "bus=%d slot=%d irq=%d\n", pdev->bus->number, slot, irq);
++	return irq;
++}
++
+ static int mt7621_pci_parse_request_of_pci_ranges(struct mt7621_pcie *pcie)
+ {
+ 	struct device *dev = pcie->dev;
+@@ -330,6 +344,7 @@ static int mt7621_pcie_parse_port(struct
+ {
+ 	struct mt7621_pcie_port *port;
+ 	struct device *dev = pcie->dev;
++	struct platform_device *pdev = to_platform_device(dev);
+ 	struct device_node *pnode = dev->of_node;
+ 	struct resource regs;
+ 	char name[10];
+@@ -371,6 +386,12 @@ static int mt7621_pcie_parse_port(struct
+ 	port->slot = slot;
+ 	port->pcie = pcie;
+ 
++	port->irq = platform_get_irq(pdev, slot);
++	if (port->irq < 0) {
++		dev_err(dev, "Failed to get IRQ for PCIe%d\n", slot);
++		return -ENXIO;
++	}
++
+ 	INIT_LIST_HEAD(&port->list);
+ 	list_add_tail(&port->list, &pcie->ports);
+ 
+@@ -585,13 +606,15 @@ static int mt7621_pcie_init_virtual_brid
+ {
+ 	u32 pcie_link_status = 0;
+ 	u32 n;
+-	int i;
++	int i = 0;
+ 	u32 p2p_br_devnum[PCIE_P2P_MAX];
++	int irqs[PCIE_P2P_MAX];
+ 	struct mt7621_pcie_port *port;
+ 
+ 	list_for_each_entry(port, &pcie->ports, list) {
+ 		u32 slot = port->slot;
+ 
++		irqs[i++] = port->irq;
+ 		if (port->enabled)
+ 			pcie_link_status |= BIT(slot);
+ 	}
+@@ -614,6 +637,15 @@ static int mt7621_pcie_init_virtual_brid
+ 		 (p2p_br_devnum[1] << PCIE_P2P_BR_DEVNUM1_SHIFT) |
+ 		 (p2p_br_devnum[2] << PCIE_P2P_BR_DEVNUM2_SHIFT));
+ 
++	/* Assign IRQs */
++	n = 0;
++	for (i = 0; i < PCIE_P2P_MAX; i++)
++		if (pcie_link_status & BIT(i))
++			pcie->irq_map[n++] = irqs[i];
++
++	for (i = n; i < PCIE_P2P_MAX; i++)
++		pcie->irq_map[i] = -1;
++
+ 	return 0;
+ }
+ 
+@@ -638,7 +670,7 @@ static int mt7621_pcie_register_host(str
+ 	host->busnr = pcie->busn.start;
+ 	host->dev.parent = pcie->dev;
+ 	host->ops = &mt7621_pci_ops;
+-	host->map_irq = of_irq_parse_and_map_pci;
++	host->map_irq = mt7621_map_irq;
+ 	host->swizzle_irq = pci_common_swizzle;
+ 	host->sysdata = pcie;
+