linux-kernel - [PATCH v3 3/6] PCI: tegra: Clear CLKREQ# enable on port disable

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Date:	Tue, 26 Aug 2014 17:11:35 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Stephen Warren <swarren@...dotorg.org>, linux-pci@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/6] PCI: tegra: Clear CLKREQ# enable on port disable

From: Thierry Reding <treding@...dia.com>

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

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 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 83fa33e16650..bd53b123218b 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);
 }
-- 
2.0.4

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