In Tegra210 AFI design has clamp value for the BIAS pad as 0, which keeps
the bias pad in non power down mode. This is leading to power consumption
of 2 mW in BIAS pad, even if the PCIe partition is powergated. To avoid
unnecessary power consumption, put PEX CLK & BIAS pads in deep power down
mode when PCIe partition is power gated.
Signed-off-by: Manikanta Maddireddy <mmaddireddy@xxxxxxxxxx>
Acked-by: Thierry Reding <treding@xxxxxxxxxx>
---
V5: No change
V4: No change
V3: No change
V2: Using standard pinctrl functions to apply default and idle states
drivers/pci/controller/pci-tegra.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index 34c5cabd8e80..d3b9e6440dd6 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -30,6 +30,7 @@
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/phy/phy.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/sizes.h>
@@ -2838,6 +2839,7 @@ static int __maybe_unused tegra_pcie_pm_suspend(struct device *dev)
if (IS_ENABLED(CONFIG_PCI_MSI))
tegra_pcie_disable_msi(pcie);
+ pinctrl_pm_select_idle_state(dev);
tegra_pcie_power_off(pcie);
return 0;
@@ -2853,6 +2855,13 @@ static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)
dev_err(dev, "tegra pcie power on fail: %d\n", err);
return err;
}
+
+ err = pinctrl_pm_select_default_state(dev);
+ if (err < 0) {
+ dev_err(dev, "failed to disable PCIe IO DPD: %d\n", err);
+ goto poweroff;
+ }
+
tegra_pcie_enable_controller(pcie);
tegra_pcie_setup_translations(pcie);
@@ -2862,7 +2871,7 @@ static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)
err = clk_prepare_enable(pcie->pex_clk);
if (err) {
dev_err(dev, "failed to enable PEX clock: %d\n", err);
- goto poweroff;
+ goto pex_dpd_enable;
}
reset_control_deassert(pcie->pex_rst);
@@ -2883,6 +2892,8 @@ static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)
disable_pex_clk:
reset_control_assert(pcie->pex_rst);
clk_disable_unprepare(pcie->pex_clk);
+pex_dpd_enable:
+ pinctrl_pm_select_idle_state(dev);
poweroff:
tegra_pcie_power_off(pcie);
--
2.17.1
