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PCI: aardvark: Assert PERST# when unbinding driver 

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 <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Pali Rohár 2021-11-30 18:29:11 +01:00 committed by Lorenzo Pieralisi
parent 2f040a17f5
commit 1f54391be8
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/controller/pci-aardvark.c
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@ -1737,6 +1737,10 @@ 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);