From 246a36b6637740f1be9c3cdd91f022b24b7402e7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= Date: Wed, 4 May 2022 18:57:34 +0200 Subject: [PATCH] PCI: aardvark: Assert PERST# when unbinding driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit commit 1f54391be8ce0c981d312cb93acdc5608def576a upstream. Put the PCIe card into reset by asserting PERST# signal when unbinding driver. It doesn't make sense to leave the card working if it can't communicate with the host. This should also save some power. Link: https://lore.kernel.org/r/20211130172913.9727-10-kabel@kernel.org Signed-off-by: Pali Rohár Signed-off-by: Marek Behún Signed-off-by: Lorenzo Pieralisi Signed-off-by: Marek Behún Signed-off-by: Greg Kroah-Hartman --- drivers/pci/controller/pci-aardvark.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 02eefc13ac60f..78bc57d579262 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -1721,6 +1721,10 @@ static int advk_pcie_remove(struct platform_device *pdev) /* Free config space for emulated root bridge */ pci_bridge_emul_cleanup(&pcie->bridge); + /* Assert PERST# signal which prepares PCIe card for power down */ + if (pcie->reset_gpio) + gpiod_set_value_cansleep(pcie->reset_gpio, 1); + /* Disable outbound address windows mapping */ for (i = 0; i < OB_WIN_COUNT; i++) advk_pcie_disable_ob_win(pcie, i);