From 0d20d6219216c5b37be8c82ee4a58d7f642e7cb0 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Tue, 26 Aug 2014 17:11:35 +0200 Subject: [PATCH] PCI: tegra: Clear CLKREQ# enable on port disable When a root port is disabled, disable the CLKREQ# signal if available. Tested-by: Stephen Warren Signed-off-by: Thierry Reding Signed-off-by: Bjorn Helgaas --- drivers/pci/host/pci-tegra.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 7be31f58a4e6..42241b5bdf02 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -569,6 +569,7 @@ static void tegra_pcie_port_enable(struct tegra_pcie_port *port) static void tegra_pcie_port_disable(struct tegra_pcie_port *port) { + const struct tegra_pcie_soc_data *soc = port->pcie->soc_data; unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); unsigned long value; @@ -579,6 +580,10 @@ static void tegra_pcie_port_disable(struct tegra_pcie_port *port) /* disable reference clock */ value = afi_readl(port->pcie, ctrl); + + if (soc->has_pex_clkreq_en) + value &= ~AFI_PEX_CTRL_CLKREQ_EN; + value &= ~AFI_PEX_CTRL_REFCLK_EN; afi_writel(port->pcie, value, ctrl); } -- 2.11.0