PCI: tegra: Clear CLKREQ# enable on port disable

When a root port is disabled, disable the CLKREQ# signal if available.

Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 5 insertions, 0 deletions

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);
 }