The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From de0a01f5296651d3a539f2d23d0db8f359483696 Mon Sep 17 00:00:00 2001

From: Hyun Kwon hyun.kwon@xilinx.com Date: Fri, 25 Jun 2021 12:48:23 +0200 Subject: [PATCH] PCI: xilinx-nwl: Enable the clock through CCF

Enable PCIe reference clock. There is no remove function that's why this should be enough for simple operation. Normally this clock is enabled by default by firmware but there are usecases where this clock should be enabled by driver itself. It is also good that PCIe clock is recorded in a clock framework.

Link: https://lore.kernel.org/r/ee6997a08fab582b1c6de05f8be184f3fe8d5357.162461810... Fixes: ab597d35ef11 ("PCI: xilinx-nwl: Add support for Xilinx NWL PCIe Host Controller") Signed-off-by: Hyun Kwon hyun.kwon@xilinx.com Signed-off-by: Bharat Kumar Gogada bharat.kumar.gogada@xilinx.com Signed-off-by: Michal Simek michal.simek@xilinx.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Cc: stable@vger.kernel.org

diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c index 8689311c5ef6..1c3d5b87ef20 100644 --- a/drivers/pci/controller/pcie-xilinx-nwl.c +++ b/drivers/pci/controller/pcie-xilinx-nwl.c @@ -6,6 +6,7 @@ * (C) Copyright 2014 - 2015, Xilinx, Inc. */

+#include <linux/clk.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/irq.h> @@ -169,6 +170,7 @@ struct nwl_pcie { u8 last_busno; struct nwl_msi msi; struct irq_domain *legacy_irq_domain; + struct clk *clk; raw_spinlock_t leg_mask_lock; };

@@ -823,6 +825,16 @@ static int nwl_pcie_probe(struct platform_device *pdev) return err; }

+ pcie->clk = devm_clk_get(dev, NULL); + if (IS_ERR(pcie->clk)) + return PTR_ERR(pcie->clk); + + err = clk_prepare_enable(pcie->clk); + if (err) { + dev_err(dev, "can't enable PCIe ref clock\n"); + return err; + } + err = nwl_pcie_bridge_init(pcie); if (err) { dev_err(dev, "HW Initialization failed\n");