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 power gated. 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>
---
drivers/pci/controller/pci-tegra.c | 65 +++++++++++++++++++++++++++++-
1 file changed, 64 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index c050687020f0..92c6daa0de84 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>
@@ -323,6 +324,7 @@ struct tegra_pcie_soc {
bool program_deskew_time;
bool raw_violation_fixup;
bool update_fc_threshold;
+ bool config_pex_io_dpd;
struct {
struct {
u32 rp_ectl_2_r1;
@@ -385,6 +387,10 @@ struct tegra_pcie {
const struct tegra_pcie_soc *soc;
struct dentry *debugfs;
+
+ struct pinctrl *pex_pinctrl;
+ struct pinctrl_state *pex_dpd_enable;
+ struct pinctrl_state *pex_dpd_disable;
};
struct tegra_pcie_port {
@@ -2154,6 +2160,37 @@ static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
return tegra_pcie_get_legacy_regulators(pcie);
}
+static int tegra_pcie_parse_pinctrl(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ int err = 0;
+
+ pcie->pex_pinctrl = devm_pinctrl_get(dev);
+ if (IS_ERR(pcie->pex_pinctrl)) {
+ err = PTR_ERR(pcie->pex_pinctrl);
+ dev_err(dev, "failed to get pinctrl handle: %d\n", err);
+ return err;
+ }
+
+ pcie->pex_dpd_enable = pinctrl_lookup_state(pcie->pex_pinctrl,
+ "pex-dpd-enable");
+ if (IS_ERR(pcie->pex_dpd_enable)) {
+ err = PTR_ERR(pcie->pex_dpd_enable);
+ dev_err(dev, "missing pex-dpd-enable state: %d\n", err);
+ return err;
+ }
+
+ pcie->pex_dpd_disable = pinctrl_lookup_state(pcie->pex_pinctrl,
+ "pex-dpd-disable");
+ if (IS_ERR(pcie->pex_dpd_disable)) {
+ err = PTR_ERR(pcie->pex_dpd_disable);
+ dev_err(dev, "missing pex-dpd-disable state: %d\n", err);
+ return err;
+ }
+
+ return err;
+}
+
static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
{
struct device *dev = pcie->dev;
@@ -2496,6 +2533,7 @@ static const struct tegra_pcie_soc tegra20_pcie = {
.program_deskew_time = false,
.raw_violation_fixup = false,
.update_fc_threshold = false,
+ .config_pex_io_dpd = false,
.ectl.enable = false,
};
@@ -2524,6 +2562,7 @@ static const struct tegra_pcie_soc tegra30_pcie = {
.program_deskew_time = false,
.raw_violation_fixup = false,
.update_fc_threshold = false,
+ .config_pex_io_dpd = false,
.ectl.enable = false,
};
@@ -2547,6 +2586,7 @@ static const struct tegra_pcie_soc tegra124_pcie = {
.program_deskew_time = false,
.raw_violation_fixup = true,
.update_fc_threshold = false,
+ .config_pex_io_dpd = false,
.ectl.enable = false,
};
@@ -2570,6 +2610,7 @@ static const struct tegra_pcie_soc tegra210_pcie = {
.program_deskew_time = true,
.raw_violation_fixup = false,
.update_fc_threshold = true,
+ .config_pex_io_dpd = true,
.ectl.regs.rp_ectl_2_r1 = 0x0000000f,
.ectl.regs.rp_ectl_4_r1 = 0x00000067,
.ectl.regs.rp_ectl_5_r1 = 0x55010000,
@@ -2607,6 +2648,7 @@ static const struct tegra_pcie_soc tegra186_pcie = {
.program_deskew_time = false,
.raw_violation_fixup = false,
.update_fc_threshold = false,
+ .config_pex_io_dpd = false,
.ectl.enable = false,
};
@@ -2753,6 +2795,12 @@ static int tegra_pcie_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&pcie->ports);
pcie->dev = dev;
+ if (pcie->soc->config_pex_io_dpd) {
+ err = tegra_pcie_parse_pinctrl(pcie);
+ if (err < 0)
+ return err;
+ }
+
err = tegra_pcie_parse_dt(pcie);
if (err < 0)
return err;
@@ -2866,6 +2914,8 @@ static int __maybe_unused tegra_pcie_pm_suspend(struct device *dev)
tegra_pcie_disable_msi(pcie);
tegra_pcie_disable_controller(pcie);
+ if (pcie->soc->config_pex_io_dpd)
+ pinctrl_select_state(pcie->pex_pinctrl, pcie->pex_dpd_enable);
tegra_pcie_power_off(pcie);
return 0;
@@ -2881,10 +2931,20 @@ static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)
dev_err(dev, "tegra pcie power on fail: %d\n", err);
return err;
}
+
+ if (pcie->soc->config_pex_io_dpd) {
+ err = pinctrl_select_state(pcie->pex_pinctrl,
+ pcie->pex_dpd_disable);
+ if (err < 0) {
+ dev_err(dev, "disabling PCIe IO DPD failed: %d\n", err);
+ goto poweroff;
+ }
+ }
+
err = tegra_pcie_enable_controller(pcie);
if (err) {
dev_err(dev, "tegra pcie controller enable fail: %d\n", err);
- goto poweroff;
+ goto pex_dpd_enable;
}
tegra_pcie_setup_translations(pcie);
@@ -2904,6 +2964,9 @@ static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)
disable_controller:
tegra_pcie_disable_controller(pcie);
+pex_dpd_enable:
+ if (pcie->soc->config_pex_io_dpd)
+ pinctrl_select_state(pcie->pex_pinctrl, pcie->pex_dpd_enable);
poweroff:
tegra_pcie_power_off(pcie);
--
2.17.1
