[PATCH v3 09/11] PCI: aardvark: Assert PERST# when unbinding driver

Marek Behún
2021-11-30T13:25:50Z

Put the PCIe card into reset by asserting PERST# signal when unbinding
driver.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
---
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 b3d89cb449b6..271ebecee965 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -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);
--
2.32.0