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612e1c6801
Backport Aardvark PCIe controller driver changes that will appear in 5.17 kernel. They are currently accessible on LKML [1], in linux-next repository [2], or in Bjorn Helgaas' repository [3]. These changes mainly enhance driver removal method. [1] https://lore.kernel.org/linux-pci/20211130172913.9727-1-kabel@kernel.org/ [2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/drivers/pci?h=next-20220107 [3] https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/log/?h=next Signed-off-by: Marek Behún <kabel@kernel.org>
40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From 759dec2e3dfdbd261c41d2279f04f2351c971a49 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
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Date: Tue, 30 Nov 2021 18:29:12 +0100
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Subject: [PATCH] PCI: aardvark: Disable link training when unbinding driver
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Disable link training circuit in driver unbind sequence. We want to
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leave link training in the same state as it was before the driver was
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probed.
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Link: https://lore.kernel.org/r/20211130172913.9727-11-kabel@kernel.org
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Signed-off-by: Pali Rohár <pali@kernel.org>
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Signed-off-by: Marek Behún <kabel@kernel.org>
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Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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---
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drivers/pci/controller/pci-aardvark.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
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index 271ebecee965..e5c88f1c177b 100644
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--- a/drivers/pci/controller/pci-aardvark.c
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+++ b/drivers/pci/controller/pci-aardvark.c
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@@ -1741,6 +1741,11 @@ static int advk_pcie_remove(struct platform_device *pdev)
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if (pcie->reset_gpio)
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gpiod_set_value_cansleep(pcie->reset_gpio, 1);
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+ /* Disable link training */
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+ val = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
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+ val &= ~LINK_TRAINING_EN;
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+ advk_writel(pcie, val, PCIE_CORE_CTRL0_REG);
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+
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/* Disable outbound address windows mapping */
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for (i = 0; i < OB_WIN_COUNT; i++)
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advk_pcie_disable_ob_win(pcie, i);
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--
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2.34.1
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