ramips: mt7621: backport PCIe driver fixes from staging-test

Backport mt7621-pci/mt7621-pci-phy fixes from staging-test

Signed-off-by: DENG Qingfang <dengqf6@mail2.sysu.edu.cn>

1 files changed, 33 insertions, 0 deletions

diff --git a/target/linux/ramips/patches-5.4/0113-staging-mt7621-pci-be-sure-gpio-descriptor-is-null-o.patch b/target/linux/ramips/patches-5.4/0113-staging-mt7621-pci-be-sure-gpio-descriptor-is-null-o.patch
new file mode 100644
index 0000000000..bf6fdf1d49
--- /dev/null
+++ b/target/linux/ramips/patches-5.4/0113-staging-mt7621-pci-be-sure-gpio-descriptor-is-null-o.patch
@@ -0,0 +1,33 @@
+From 87068309300c707d659ce79232eae827604804a4 Mon Sep 17 00:00:00 2001
+From: Sergio Paracuellos <sergio.paracuellos@gmail.com>
+Date: Fri, 20 Mar 2020 12:01:23 +0100
+Subject: [PATCH] staging: mt7621-pci: be sure gpio descriptor is null on fails
+
+Function 'devm_gpiod_get_index_optional' returns NULL if the
+descriptor is invalid and the error associated for the error
+pointer is ENOENT. Sometimes if the pin is just assigned the
+error associated for the pointer might not be ENOENT but other.
+In order to avoid weirds behaviours if this happen set descriptor
+to NULL in the driver port structure.
+
+Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
+Link: https://lore.kernel.org/r/20200320110123.9907-6-sergio.paracuellos@gmail.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/staging/mt7621-pci/pci-mt7621.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/drivers/staging/mt7621-pci/pci-mt7621.c
++++ b/drivers/staging/mt7621-pci/pci-mt7621.c
+@@ -363,8 +363,10 @@ static int mt7621_pcie_parse_port(struct
+ 
+ 	port->gpio_rst = devm_gpiod_get_index_optional(dev, "reset", slot,
+ 						       GPIOD_OUT_LOW);
+-	if (IS_ERR(port->gpio_rst))
++	if (IS_ERR(port->gpio_rst)) {
+ 		dev_notice(dev, "Failed to get GPIO for PCIe%d\n", slot);
++		port->gpio_rst = NULL;
++	}
+ 
+ 	port->slot = slot;
+ 	port->pcie = pcie;