[PATCH 6.18 334/752] phy: cadence-torrent: restore parent clock for refclk during resume

Sasha Levin
2026-02-28T17:52:48Z

From: "Thomas Richard (TI.com)" <thomas.richard@bootlin.com>

[ Upstream commit 434e1a0ee145d0389b192252be4c993f86cf1134 ]

While suspend and resume, parent clock config for refclk was getting lost.
So save and restore it in suspend and resume operations.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Thomas Richard (TI.com) <thomas.richard@bootlin.com>
Link: https://patch.msgid.link/20251216-phy-cadence-torrent-resume-restore-refclk-parent-v3-1-8a7ed84b47e3@bootlin.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/phy/cadence/phy-cadence-torrent.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index 37fa4bad6bd72..877f22177c699 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -397,6 +397,7 @@ struct cdns_torrent_refclk_driver {
struct clk_hw hw;
struct regmap_field *cmn_fields[REFCLK_OUT_NUM_CMN_CONFIG];
struct clk_init_data clk_data;
+ u8 parent_index;
};

#define to_cdns_torrent_refclk_driver(_hw) \
@@ -3326,11 +3327,29 @@ static const struct cdns_torrent_vals sgmii_qsgmii_xcvr_diag_ln_vals = {
.num_regs = ARRAY_SIZE(sgmii_qsgmii_xcvr_diag_ln_regs),
};

+static void cdns_torrent_refclk_driver_suspend(struct cdns_torrent_phy *cdns_phy)
+{
+ struct clk_hw *hw = cdns_phy->clk_hw_data->hws[CDNS_TORRENT_REFCLK_DRIVER];
+ struct cdns_torrent_refclk_driver *refclk_driver = to_cdns_torrent_refclk_driver(hw);
+
+ refclk_driver->parent_index = cdns_torrent_refclk_driver_get_parent(hw);
+}
+
+static int cdns_torrent_refclk_driver_resume(struct cdns_torrent_phy *cdns_phy)
+{
+ struct clk_hw *hw = cdns_phy->clk_hw_data->hws[CDNS_TORRENT_REFCLK_DRIVER];
+ struct cdns_torrent_refclk_driver *refclk_driver = to_cdns_torrent_refclk_driver(hw);
+
+ return cdns_torrent_refclk_driver_set_parent(hw, refclk_driver->parent_index);
+}
+
static int cdns_torrent_phy_suspend_noirq(struct device *dev)
{
struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(dev);
int i;

+ cdns_torrent_refclk_driver_suspend(cdns_phy);
+
reset_control_assert(cdns_phy->phy_rst);
reset_control_assert(cdns_phy->apb_rst);
for (i = 0; i < cdns_phy->nsubnodes; i++)
@@ -3352,6 +3371,10 @@ static int cdns_torrent_phy_resume_noirq(struct device *dev)
int node = cdns_phy->nsubnodes;
int ret, i;

+ ret = cdns_torrent_refclk_driver_resume(cdns_phy);
+ if (ret)
+ return ret;
+
ret = cdns_torrent_clk(cdns_phy);
if (ret)
return ret;
--
2.51.0