1 From fc6be080960bdd4cd109a7595fbffe94e5047bc4 Mon Sep 17 00:00:00 2001
    2 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
    3 Date: Thu, 11 Mar 2021 12:13:10 +0100
    4 Subject: [PATCH 7/7] PCI: aardvark: Reset PCIe card and disable PHY at driver
    5  unbind
    6 MIME-Version: 1.0
    7 Content-Type: text/plain; charset=UTF-8
    8 Content-Transfer-Encoding: 8bit
    9 
   10 When unbinding driver, assert PERST# signal which prepares PCIe card for
   11 power down. Then disable link training and PHY.
   12 
   13 Fixes: 526a76991b7b ("PCI: aardvark: Implement driver 'remove' function and allow to build it as module")
   14 Signed-off-by: Pali Rohár <pali@kernel.org>
   15 Signed-off-by: Marek Behún <kabel@kernel.org>
   16 Cc: stable@vger.kernel.org
   17 ---
   18  drivers/pci/controller/pci-aardvark.c | 12 ++++++++++++
   19  1 file changed, 12 insertions(+)
   20 
   21 diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
   22 index b3d89cb449b6..2a82c4652c28 100644
   23 --- a/drivers/pci/controller/pci-aardvark.c
   24 +++ b/drivers/pci/controller/pci-aardvark.c
   25 @@ -1737,10 +1737,22 @@ static int advk_pcie_remove(struct platform_device *pdev)
   26         /* Free config space for emulated root bridge */
   27         pci_bridge_emul_cleanup(&pcie->bridge);
   28  
   29 +       /* Assert PERST# signal which prepares PCIe card for power down */
   30 +       if (pcie->reset_gpio)
   31 +               gpiod_set_value_cansleep(pcie->reset_gpio, 1);
   32 +
   33 +       /* Disable link training */
   34 +       val = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
   35 +       val &= ~LINK_TRAINING_EN;
   36 +       advk_writel(pcie, val, PCIE_CORE_CTRL0_REG);
   37 +
   38         /* Disable outbound address windows mapping */
   39         for (i = 0; i < OB_WIN_COUNT; i++)
   40                 advk_pcie_disable_ob_win(pcie, i);
   41  
   42 +       /* Disable phy */
   43 +       advk_pcie_disable_phy(pcie);
   44 +
   45         return 0;
   46  }
   47  
   48 -- 
   49 2.32.0
   50