[PATCH v3 14/18] phy: cadence-torrent: add suspend and resume support

Thomas Richard
2024-02-15T15:18:16Z

Add suspend and resume support.

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

Based on the work of Théo Lebrun <theo.lebrun@bootlin.com>

Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
---
drivers/phy/cadence/phy-cadence-torrent.c | 54 +++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index 52cadca4c07b..f8945a11e7ca 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -3005,6 +3005,59 @@ 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)
+ cdns_phy->already_configured = 0;
+ else
+ clk_disable_unprepare(cdns_phy->clk);
+
+ 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},
@@ -4576,6 +4629,7 @@ 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);

--
2.39.2