diff options
| author | Richard Zhu <Richard.Zhu@freescale.com> | 2014-12-18 14:02:37 +0800 |
|---|---|---|
| committer | Richard Zhu <Richard.Zhu@freescale.com> | 2014-12-22 08:58:22 +0800 |
| commit | c0d12ce9fd7dbec07ec5f26f2ef830b9c385356f (patch) | |
| tree | 5650692bd4fd32b362de0b8a61b675e97b0f52a7 /drivers/pci/host/pci-imx6.c | |
| parent | 6adee22e7fbcad3ea39cf12b2bc3a534ff2f28f6 (diff) | |
MLK-10017 PCI: save power when pcie is not used
In order to save power consumption, do the
following actions when pcie is not used.
- turn off clocks on imx6q/dl.
- turn off clocks and power on imx6sx
Signed-off-by: Richard Zhu <Richard.Zhu@freescale.com>
(cherry picked from commit e9796dfbae2a8b732022a6c96b3d7803099a70b5)
Diffstat (limited to 'drivers/pci/host/pci-imx6.c')
| -rw-r--r-- | drivers/pci/host/pci-imx6.c | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 1d0c96120e9a..1d88f4201bef 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -422,7 +422,7 @@ static irqreturn_t imx_pcie_msi_irq_handler(int irq, void *arg) return IRQ_HANDLED; } -static void imx6_pcie_host_init(struct pcie_port *pp) +static int imx6_pcie_host_init(struct pcie_port *pp) { int count = 0; struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); @@ -459,14 +459,37 @@ static void imx6_pcie_host_init(struct pcie_port *pp) "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n", readl(pp->dbi_base + PCIE_PHY_DEBUG_R0), readl(pp->dbi_base + PCIE_PHY_DEBUG_R1)); - return; + clk_disable_unprepare(imx6_pcie->pcie_axi); + if (!IS_ENABLED(CONFIG_EP_MODE_IN_EP_RC_SYS) + && !IS_ENABLED(CONFIG_RC_MODE_IN_EP_RC_SYS)) + clk_disable_unprepare(imx6_pcie->lvds_gate); + clk_disable_unprepare(imx6_pcie->pcie_ref_125m); + if (is_imx6sx_pcie(imx6_pcie)) { + /* Disable clks and power down PCIe PHY */ + clk_disable_unprepare(imx6_pcie->dis_axi); + release_bus_freq(BUS_FREQ_HIGH); + + /* Put PCIe PHY to be isolation */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, + IOMUXC_GPR0, BIT(6), 1 << 6); + + /* + * Power down PCIe PHY. + */ + regulator_disable(imx6_pcie->pcie_phy_reg); + regulator_disable(imx6_pcie->pcie_reg); + } else { + clk_disable_unprepare(imx6_pcie->sata_ref_100m); + release_bus_freq(BUS_FREQ_HIGH); + } + return -ENODEV; } } if (IS_ENABLED(CONFIG_PCI_MSI)) dw_pcie_msi_init(pp); - return; + return 0; } static int imx6_pcie_link_up(struct pcie_port *pp) |