mvebu: armada-37xx: Backport PCI aardvark patches

This commit contains patches for PCI aardvark driver and relevant DTS
changes for Turris MOX and EspressoBin backported from mainline kernel.
It fixes support for old ATF, various wifi cards, mainly Compex WLE900VX.

Signed-off-by: Pali Rohár <pali@kernel.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-5.4/403-PCI-aardvark-Don-t-rely-on-jiffies-while-holding-spi.patch b/target/linux/mvebu/patches-5.4/403-PCI-aardvark-Don-t-rely-on-jiffies-while-holding-spi.patch
new file mode 100644
index 0000000000..db4afd22a2
--- /dev/null
+++ b/target/linux/mvebu/patches-5.4/403-PCI-aardvark-Don-t-rely-on-jiffies-while-holding-spi.patch
@@ -0,0 +1,54 @@
+From 7fbcb5da811be7d47468417c7795405058abb3da Mon Sep 17 00:00:00 2001
+From: Remi Pommarel <repk@triplefau.lt>
+Date: Fri, 27 Sep 2019 10:55:02 +0200
+Subject: [PATCH] PCI: aardvark: Don't rely on jiffies while holding spinlock
+
+advk_pcie_wait_pio() can be called while holding a spinlock (from
+pci_bus_read_config_dword()), then depends on jiffies in order to
+timeout while polling on PIO state registers. In the case the PIO
+transaction failed, the timeout will never happen and will also cause
+the cpu to stall.
+
+This decrements a variable and wait instead of using jiffies.
+
+Signed-off-by: Remi Pommarel <repk@triplefau.lt>
+Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+Reviewed-by: Andrew Murray <andrew.murray@arm.com>
+Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ drivers/pci/controller/pci-aardvark.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -175,7 +175,8 @@
+ 	(PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn))	| \
+ 	 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
+ 
+-#define PIO_TIMEOUT_MS			1
++#define PIO_RETRY_CNT			500
++#define PIO_RETRY_DELAY			2 /* 2 us*/
+ 
+ #define LINK_WAIT_MAX_RETRIES		10
+ #define LINK_WAIT_USLEEP_MIN		90000
+@@ -400,17 +401,16 @@ static void advk_pcie_check_pio_status(s
+ static int advk_pcie_wait_pio(struct advk_pcie *pcie)
+ {
+ 	struct device *dev = &pcie->pdev->dev;
+-	unsigned long timeout;
++	int i;
+ 
+-	timeout = jiffies + msecs_to_jiffies(PIO_TIMEOUT_MS);
+-
+-	while (time_before(jiffies, timeout)) {
++	for (i = 0; i < PIO_RETRY_CNT; i++) {
+ 		u32 start, isr;
+ 
+ 		start = advk_readl(pcie, PIO_START);
+ 		isr = advk_readl(pcie, PIO_ISR);
+ 		if (!start && isr)
+ 			return 0;
++		udelay(PIO_RETRY_DELAY);
+ 	}
+ 
+ 	dev_err(dev, "config read/write timed out\n");