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PCI: tegra: Clear CLKREQ# enable on port disable

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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>
This commit is contained in:
Thierry Reding 2014-08-26 17:11:35 +02:00 committed by Bjorn Helgaas
parent 41534e5378
commit 0d20d62192
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/host/pci-tegra.c
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@ -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);
}