Hardware initialisation is only done at probe. The J7200 USB controller
is reset at resume because of power-domains toggling off & on. We
therefore reconfigure the hardware at resume.
Reuse the newly extracted cdns_ti_init_hw() function that contains the
register write sequence.
Only focus J7200 as other SoC are untested. If the controller does not
reset we do not want to redo reg writes.
Signed-off-by: Théo Lebrun <theo.lebrun@xxxxxxxxxxx>
---
drivers/usb/cdns3/cdns3-ti.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
index d4232b440e4e..84f93c2fcd5c 100644
--- a/drivers/usb/cdns3/cdns3-ti.c
+++ b/drivers/usb/cdns3/cdns3-ti.c
@@ -58,6 +58,7 @@ struct cdns_ti {
struct clk *usb2_refclk;
struct clk *lpm_clk;
int usb2_refclk_rate_code;
+ bool reset_on_resume;
};
static const int cdns_ti_rate_table[] = { /* in KHZ */
@@ -172,6 +173,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
data->usb2_refclk_rate_code = i;
data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");
data->usb2_only = device_property_read_bool(dev, "ti,usb2-only");
+ data->reset_on_resume = of_device_is_compatible(node, "ti,j7200-usb");
cdns_ti_init_hw(data);
@@ -202,7 +204,26 @@ static void cdns_ti_remove(struct platform_device *pdev)
platform_set_drvdata(pdev, NULL);
}
+#ifdef CONFIG_PM
+
+static int cdns_ti_resume(struct device *dev)
+{
+ struct cdns_ti *data = dev_get_drvdata(dev);
+
+ if (data->reset_on_resume)
+ cdns_ti_init_hw(data);
+
+ return 0;
+}
+
+static const struct dev_pm_ops cdns_ti_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(NULL, cdns_ti_resume)
+};
+
+#endif /* CONFIG_PM */
+
static const struct of_device_id cdns_ti_of_match[] = {
+ { .compatible = "ti,j7200-usb", },
{ .compatible = "ti,j721e-usb", },
{ .compatible = "ti,am64-usb", },
{},
@@ -213,8 +234,9 @@ static struct platform_driver cdns_ti_driver = {
.probe = cdns_ti_probe,
.remove_new = cdns_ti_remove,
.driver = {
- .name = "cdns3-ti",
+ .name = "cdns3-ti",
.of_match_table = cdns_ti_of_match,
+ .pm = pm_ptr(&cdns_ti_pm_ops),
},
};
--
2.42.0
