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From: Manikanta Maddireddy <mmaddireddy@nvidia.com>
To: <thierry.reding@gmail.com>, <bhelgaas@google.com>,
	<robh+dt@kernel.org>, <mark.rutland@arm.com>,
	<jonathanh@nvidia.com>, <lorenzo.pieralisi@arm.com>,
	<vidyas@nvidia.com>
Cc: <linux-tegra@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<devicetree@vger.kernel.org>,
	Manikanta Maddireddy <mmaddireddy@nvidia.com>
Subject: [PATCH 25/30] PCI: tegra: Put PEX CLK & BIAS pads in DPD mode
Date: Thu, 11 Apr 2019 22:33:50 +0530
Message-ID: <20190411170355.6882-26-mmaddireddy@nvidia.com> (raw)
In-Reply-To: <20190411170355.6882-1-mmaddireddy@nvidia.com>

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@nvidia.com>
---
 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


  parent reply index

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-11 17:03 [PATCH 00/30] Enable Tegra PCIe root port features Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 01/30] soc/tegra: pmc: Export tegra_powergate_power_on() Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 02/30] PCI: tegra: Fix PCIe host power up sequence Manikanta Maddireddy
2019-04-15 11:01   ` Thierry Reding
2019-04-15 14:11     ` Manikanta Maddireddy
2019-04-15 14:30       ` Thierry Reding
2019-04-15 18:14         ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 03/30] PCI: tegra: Move REFCLK pad settings out of phy_power_on() Manikanta Maddireddy
2019-04-15 11:06   ` Thierry Reding
2019-04-15 14:20     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 04/30] PCI: tegra: Add PCIe Gen2 link speed support Manikanta Maddireddy
2019-04-15 11:21   ` Thierry Reding
2019-04-15 14:47     ` Manikanta Maddireddy
2019-04-15 15:36       ` Thierry Reding
2019-04-15 15:53         ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 05/30] PCI: tegra: Advertise PCIe Advanced Error Reporting (AER) capability Manikanta Maddireddy
2019-04-15 11:23   ` Thierry Reding
2019-04-15 14:49     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 06/30] PCI: tegra: Program UPHY electrical settings for Tegra210 Manikanta Maddireddy
2019-04-15 11:29   ` Thierry Reding
2019-04-15 14:55     ` Manikanta Maddireddy
2019-04-15 15:38       ` Thierry Reding
2019-04-11 17:03 ` [PATCH 07/30] PCI: tegra: Enable opportunistic update FC and ACK Manikanta Maddireddy
2019-04-15 11:30   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 08/30] PCI: tegra: Disable AFI dynamic clock gating Manikanta Maddireddy
2019-04-15 11:32   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 09/30] PCI: tegra: Process pending DLL transactions before entering L1 or L2 Manikanta Maddireddy
2019-04-15 11:33   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 10/30] PCI: tegra: Enable PCIe xclk clock clamping Manikanta Maddireddy
2019-04-15 11:37   ` Thierry Reding
2019-04-15 14:58     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 11/30] PCI: tegra: Increase the deskew retry time Manikanta Maddireddy
2019-04-15 11:39   ` Thierry Reding
2019-04-15 14:58     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 12/30] PCI: tegra: Add SW fixup for RAW violations Manikanta Maddireddy
2019-04-11 20:01   ` Bjorn Helgaas
2019-04-12  5:59     ` Manikanta Maddireddy
2019-04-15 11:41       ` Thierry Reding
2019-04-15 11:45   ` Thierry Reding
2019-04-15 15:02     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 13/30] PCI: tegra: Update flow control threshold in Tegra210 Manikanta Maddireddy
2019-04-15 11:47   ` Thierry Reding
2019-04-15 15:05     ` Manikanta Maddireddy
2019-04-23  9:27       ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 14/30] PCI: tegra: Set target speed as Gen1 before link up Manikanta Maddireddy
2019-04-11 20:04   ` Bjorn Helgaas
2019-04-12  6:44     ` Manikanta Maddireddy
2019-04-12 14:35       ` Bjorn Helgaas
2019-04-15 10:43         ` Manikanta Maddireddy
2019-04-15 11:52   ` Thierry Reding
2019-04-15 15:12     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 15/30] PCI: tegra: Fix PLLE powerdown issue due to CLKREQ# signal Manikanta Maddireddy
2019-04-15 13:17   ` Thierry Reding
2019-04-15 15:14     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 16/30] PCI: tegra: Program AFI_CACHE* registers only for Tegra20 Manikanta Maddireddy
2019-04-15 13:20   ` Thierry Reding
2019-04-16 10:47     ` Manikanta Maddireddy
2019-04-16 16:11       ` Thierry Reding
2019-04-11 17:03 ` [PATCH 17/30] PCI: tegra: Use switch statements in tegra_pcie_isr() Manikanta Maddireddy
2019-04-15 13:25   ` Thierry Reding
2019-04-15 15:25     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 18/30] PCI: tegra: Change PRSNT_SENSE irq log to debug Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 19/30] PCI: tegra: Use legacy irq for port service drivers Manikanta Maddireddy
2019-04-15 13:35   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 20/30] PCI: tegra: Add AFI_PEX2_CTRL reg offset as part of soc struct Manikanta Maddireddy
2019-04-15 13:31   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 21/30] PCI: tegra: Add "pci" type check before parsing child device tree node Manikanta Maddireddy
2019-04-15 13:37   ` Thierry Reding
2019-04-15 15:30     ` Manikanta Maddireddy
2019-04-15 15:42       ` Thierry Reding
2019-04-11 17:03 ` [PATCH 22/30] PCI: tegra: Access endpoint config only if PCIe link is up Manikanta Maddireddy
2019-04-11 20:15   ` Bjorn Helgaas
2019-04-12  7:00     ` Manikanta Maddireddy
2019-04-12 14:50       ` Bjorn Helgaas
2019-04-15 11:36         ` Manikanta Maddireddy
2019-04-15 13:45           ` Thierry Reding
2019-04-15 13:52             ` Thierry Reding
2019-04-15 14:04           ` Bjorn Helgaas
2019-04-15 15:43             ` Manikanta Maddireddy
2019-04-23 20:24               ` Bjorn Helgaas
2019-04-11 17:03 ` [PATCH 23/30] dt-bindings: pci: tegra: Document PCIe DPD pinctrl optional prop Manikanta Maddireddy
2019-04-15 14:07   ` Thierry Reding
2019-04-15 15:48     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 24/30] arm64: tegra: Add PEX DPD states as pinctrl properties Manikanta Maddireddy
2019-04-11 17:03 ` Manikanta Maddireddy [this message]
2019-04-15 14:11   ` [PATCH 25/30] PCI: tegra: Put PEX CLK & BIAS pads in DPD mode Thierry Reding
2019-04-11 17:03 ` [PATCH 26/30] dt-bindings: pci: tegra: Document nvidia,plat-gpios optional prop Manikanta Maddireddy
2019-04-11 20:18   ` Bjorn Helgaas
2019-04-12  7:01     ` Manikanta Maddireddy
2019-04-15 14:16   ` Thierry Reding
2019-04-15 17:58     ` Manikanta Maddireddy
2019-04-16 15:34       ` Thierry Reding
2019-04-17 11:22         ` Manikanta Maddireddy
2019-04-17 15:19           ` Thierry Reding
2019-04-17 18:26             ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 27/30] PCI: tegra: Add support to configure platform GPIOs Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 28/30] dt-bindings: pci: tegra: Document nvidia,rst-gpio optional prop Manikanta Maddireddy
2019-04-15 14:20   ` Thierry Reding
2019-04-15 18:01     ` Manikanta Maddireddy
2019-04-29 18:33     ` Rob Herring
2019-04-11 17:03 ` [PATCH 29/30] PCI: tegra: Add support for GPIO based PCIe reset Manikanta Maddireddy
2019-04-15 14:20   ` Thierry Reding
2019-04-15 18:03     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 30/30] PCI: tegra: Change link retry log level to INFO Manikanta Maddireddy
2019-04-15 14:23   ` Thierry Reding
2019-04-15 18:05     ` Manikanta Maddireddy

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