kernel: 5.10: Backport pci-aardvark driver changes from 5.17

[openwrt/openwrt.git] / target / linux / generic / backport-5.10 / 850-v5.17-0009-PCI-aardvark-Assert-PERST-when-unbinding-driver.patch

diff --git a/target/linux/generic/backport-5.10/850-v5.17-0009-PCI-aardvark-Assert-PERST-when-unbinding-driver.patch b/target/linux/generic/backport-5.10/850-v5.17-0009-PCI-aardvark-Assert-PERST-when-unbinding-driver.patch
new file mode 100644 (file)
index 0000000..8b6beed
--- /dev/null
+++ b/target/linux/generic/backport-5.10/850-v5.17-0009-PCI-aardvark-Assert-PERST-when-unbinding-driver.patch
@@ -0,0 +1,38 @@
+From 1f54391be8ce0c981d312cb93acdc5608def576a Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Tue, 30 Nov 2021 18:29:11 +0100
+Subject: [PATCH] PCI: aardvark: Assert PERST# when unbinding driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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>
+---
+ 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);
+-- 
+2.34.1
+