[v2,12/15] phy: cadence-torrent: add suspend and resume support

Commit Message

Thomas Richard Jan. 26, 2024, 2:36 p.m. UTC

Add suspend and resume support.

The already_configured flag is cleared during suspend stage to force the
PHY initialization during the resume stage.

Based on the work of Théo Lebrun <[e-mail]>

Signed-off-by: Thomas Richard <[e-mail]>
---
 drivers/phy/cadence/phy-cadence-torrent.c | 54 +++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

Comments

Andy Shevchenko Jan. 26, 2024, 9:48 p.m. UTC | #1

On Fri, Jan 26, 2024 at 4:38 PM Thomas Richard
<[e-mail]> wrote:
>
> Add suspend and resume support.
>
> The already_configured flag is cleared during suspend stage to force the

the suspend

> PHY initialization during the resume stage.

...

> +       if (!cdns_phy->already_configured)
> +               clk_disable_unprepare(cdns_phy->clk);
> +       else
> +               cdns_phy->already_configured = 0;

What's wrong with a positive check?
Why do you need unprepare clock?

Patch

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index 70413fca5776..5f4ecf371030 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -3006,6 +3006,59 @@  static void cdns_torrent_phy_remove(struct platform_device *pdev)
 	cdns_torrent_clk_cleanup(cdns_phy);
 }
 
+static int cdns_torrent_phy_suspend_noirq(struct device *dev)
+{
+	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(dev);
+	int i;
+
+	reset_control_assert(cdns_phy->phy_rst);
+	reset_control_assert(cdns_phy->apb_rst);
+	for (i = 0; i < cdns_phy->nsubnodes; i++)
+		reset_control_assert(cdns_phy->phys[i].lnk_rst);
+
+	if (!cdns_phy->already_configured)
+		clk_disable_unprepare(cdns_phy->clk);
+	else
+		cdns_phy->already_configured = 0;
+
+	return 0;
+}
+
+static int cdns_torrent_phy_resume_noirq(struct device *dev)
+{
+	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(dev);
+	int node = cdns_phy->nsubnodes;
+	int ret, i;
+
+	ret = cdns_torrent_clk(cdns_phy);
+	if (ret)
+		goto clk_cleanup;
+
+	/* Enable APB */
+	reset_control_deassert(cdns_phy->apb_rst);
+
+	if (cdns_phy->nsubnodes > 1) {
+		ret = cdns_torrent_phy_configure_multilink(cdns_phy);
+		if (ret)
+			goto put_lnk_rst;
+	}
+
+	return 0;
+
+put_lnk_rst:
+	for (i = 0; i < node; i++)
+		reset_control_assert(cdns_phy->phys[i].lnk_rst);
+	reset_control_assert(cdns_phy->apb_rst);
+	clk_disable_unprepare(cdns_phy->clk);
+clk_cleanup:
+	cdns_torrent_clk_cleanup(cdns_phy);
+	return ret;
+}
+
+static DEFINE_NOIRQ_DEV_PM_OPS(cdns_torrent_phy_pm_ops,
+			       cdns_torrent_phy_suspend_noirq,
+			       cdns_torrent_phy_resume_noirq);
+
 /* USB and DP link configuration */
 static struct cdns_reg_pairs usb_dp_link_cmn_regs[] = {
 	{0x0002, PHY_PLL_CFG},
@@ -4577,6 +4630,7 @@  static struct platform_driver cdns_torrent_phy_driver = {
 	.driver = {
 		.name	= "cdns-torrent-phy",
 		.of_match_table	= cdns_torrent_phy_of_match,
+		.pm	= pm_sleep_ptr(&cdns_torrent_phy_pm_ops),
 	}
 };
 module_platform_driver(cdns_torrent_phy_driver);