1 files changed, 34 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/850-v5.17-0010-PCI-aardvark-Disable-link-training-when-unbinding-dr.patch b/target/linux/generic/backport-5.15/850-v5.17-0010-PCI-aardvark-Disable-link-training-when-unbinding-dr.patch
new file mode 100644
index 0000000000..3b531deae0
--- /dev/null
+++ b/target/linux/generic/backport-5.15/850-v5.17-0010-PCI-aardvark-Disable-link-training-when-unbinding-dr.patch
@@ -0,0 +1,34 @@
+From 759dec2e3dfdbd261c41d2279f04f2351c971a49 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Tue, 30 Nov 2021 18:29:12 +0100
+Subject: [PATCH] PCI: aardvark: Disable link training when unbinding driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Disable link training circuit in driver unbind sequence. We want to
+leave link training in the same state as it was before the driver was
+probed.
+
+Link: https://lore.kernel.org/r/20211130172913.9727-11-kabel@kernel.org
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+---
+ drivers/pci/controller/pci-aardvark.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1742,6 +1742,11 @@ static int advk_pcie_remove(struct platf
+ 	if (pcie->reset_gpio)
+ 		gpiod_set_value_cansleep(pcie->reset_gpio, 1);
+ 
++	/* Disable link training */
++	val = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
++	val &= ~LINK_TRAINING_EN;
++	advk_writel(pcie, val, PCIE_CORE_CTRL0_REG);
++
+ 	/* Disable outbound address windows mapping */
+ 	for (i = 0; i < OB_WIN_COUNT; i++)
+ 		advk_pcie_disable_ob_win(pcie, i);