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List: linux-pci
Subject: [PATCH v4 10/11] PCI: aardvark: Disable link training when unbinding driver
From: Marek Behún <kabel () kernel ! org>
Date: 2021-11-30 17:29:12
Message-ID: 20211130172913.9727-11-kabel () kernel ! org
[Download RAW message or body]
From: Pali Rohár <pali@kernel.org>
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.
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
---
drivers/pci/controller/pci-aardvark.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 271ebecee965..e5c88f1c177b 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1741,6 +1741,11 @@ static int advk_pcie_remove(struct platform_device *pdev)
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);
--
2.32.0
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