linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: <honghui.zhang@mediatek.com>
To: <lorenzo.pieralisi@arm.com>, <bhelgaas@google.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>, <linux-pci@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <ryder.lee@mediatek.com>
Cc: <ulf.hansson@linaro.org>, <marc.zyngier@arm.com>,
	<matthias.bgg@gmail.com>, <devicetree@vger.kernel.org>,
	<yingjoe.chen@mediatek.com>, <eddie.huang@mediatek.com>,
	<honghui.zhang@mediatek.com>, <youlin.pei@mediatek.com>,
	<yt.shen@mediatek.com>, <jianjun.wang@mediatek.com>,
	<yong.wu@mediatek.com>
Subject: [PATCH v8 7/9] PCI: mediatek: Add system PM support for MT2712 and MT7622
Date: Mon, 15 Oct 2018 16:08:58 +0800	[thread overview]
Message-ID: <1539590940-13355-8-git-send-email-honghui.zhang@mediatek.com> (raw)
In-Reply-To: <1539590940-13355-1-git-send-email-honghui.zhang@mediatek.com>

From: Honghui Zhang <honghui.zhang@mediatek.com>

In order to reduce the PCIe power consuming while system suspend,
the physical layer should be gated. And the PCIe link should be
re-established and the related control register values should be
re-initialized after system resume.

Register suspend_noirq & resume_noirq callback functions to allow
PCIe to come up after resume from RAM.

Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
Acked-by: Ryder Lee <ryder.lee@mediatek.com>
---
 drivers/pci/controller/pcie-mediatek.c | 50 ++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index d3f4694..42cf2a4 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -1168,6 +1168,55 @@ static int mtk_pcie_probe(struct platform_device *pdev)
 	return err;
 }
 
+static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
+{
+	struct mtk_pcie *pcie = dev_get_drvdata(dev);
+	struct mtk_pcie_port *port;
+
+	if (list_empty(&pcie->ports))
+		return 0;
+
+	list_for_each_entry(port, &pcie->ports, list) {
+		clk_disable_unprepare(port->pipe_ck);
+		clk_disable_unprepare(port->obff_ck);
+		clk_disable_unprepare(port->axi_ck);
+		clk_disable_unprepare(port->aux_ck);
+		clk_disable_unprepare(port->ahb_ck);
+		clk_disable_unprepare(port->sys_ck);
+		phy_power_off(port->phy);
+		phy_exit(port->phy);
+	}
+
+	clk_disable_unprepare(pcie->free_ck);
+
+	return 0;
+}
+
+static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
+{
+	struct mtk_pcie *pcie = dev_get_drvdata(dev);
+	struct mtk_pcie_port *port, *tmp;
+
+	if (list_empty(&pcie->ports))
+		return 0;
+
+	clk_prepare_enable(pcie->free_ck);
+
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+		mtk_pcie_enable_port(port);
+
+	/* In case of EP was removed while system suspend. */
+	if (list_empty(&pcie->ports))
+		clk_disable_unprepare(pcie->free_ck);
+
+	return 0;
+}
+
+static const struct dev_pm_ops mtk_pcie_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq,
+				      mtk_pcie_resume_noirq)
+};
+
 static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
 	.ops = &mtk_pcie_ops,
 	.startup = mtk_pcie_startup_port,
@@ -1200,6 +1249,7 @@ static struct platform_driver mtk_pcie_driver = {
 		.name = "mtk-pcie",
 		.of_match_table = mtk_pcie_ids,
 		.suppress_bind_attrs = true,
+		.pm = &mtk_pcie_pm_ops,
 	},
 };
 builtin_platform_driver(mtk_pcie_driver);
-- 
2.6.4


  parent reply	other threads:[~2018-10-15  8:09 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-15  8:08 [PATCH v8 0/9] PCI: mediatek: fixup find_port, enable_msi and add PM, module support honghui.zhang
2018-10-15  8:08 ` [PATCH v8 1/9] PCI: mediatek: Using slot's devfn for compare to fix mtk_pcie_find_port logic honghui.zhang
2018-10-15  8:08 ` [PATCH v8 2/9] PCI: mediatek: Fix class type for MT7622 as PCI_CLASS_BRIDGE_PCI honghui.zhang
2018-10-15 18:37   ` Bjorn Helgaas
2018-10-15  8:08 ` [PATCH v8 3/9] PCI: mediatek: Remove the redundant dev->pm_domain check honghui.zhang
2018-10-15  8:08 ` [PATCH v8 4/9] PCI: mediatek: Convert to use pci_host_probe() honghui.zhang
2018-10-15  8:08 ` [PATCH v8 5/9] PCI: mediatek: Move the mtk_pcie_startup_port_v2 function's define after mtk_pcie_setup_irq honghui.zhang
2018-10-15  8:08 ` [PATCH v8 6/9] PCI: mediatek: Fixup enable MSI logic by enable MSI after clock enabled honghui.zhang
2018-10-15  8:08 ` honghui.zhang [this message]
2018-10-15  8:08 ` [PATCH v8 8/9] PCI: mediatek: Save the GIC IRQ in mtk_pcie_port honghui.zhang
2018-10-15  8:09 ` [PATCH v8 9/9] PCI: mediatek: Add loadable kernel module support honghui.zhang
2018-10-17 15:19 ` [PATCH v8 0/9] PCI: mediatek: fixup find_port, enable_msi and add PM, " Lorenzo Pieralisi
2018-10-18  1:26   ` Honghui Zhang

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1539590940-13355-8-git-send-email-honghui.zhang@mediatek.com \
    --to=honghui.zhang@mediatek.com \
    --cc=bhelgaas@google.com \
    --cc=devicetree@vger.kernel.org \
    --cc=eddie.huang@mediatek.com \
    --cc=jianjun.wang@mediatek.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mediatek@lists.infradead.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=lorenzo.pieralisi@arm.com \
    --cc=marc.zyngier@arm.com \
    --cc=matthias.bgg@gmail.com \
    --cc=ryder.lee@mediatek.com \
    --cc=ulf.hansson@linaro.org \
    --cc=yingjoe.chen@mediatek.com \
    --cc=yong.wu@mediatek.com \
    --cc=youlin.pei@mediatek.com \
    --cc=yt.shen@mediatek.com \
    --subject='Re: [PATCH v8 7/9] PCI: mediatek: Add system PM support for MT2712 and MT7622' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox