The dsps platform needs to save save some registers at suspend time and
restore them after resume. This patch adds a struct for these registers,
and also lets the musb core know that the core registers need to be
saved as well.
Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
---
drivers/usb/musb/musb_dsps.c | 60 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 5eba143..f2f4b3a 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -112,6 +112,19 @@ struct dsps_musb_wrapper {
u8 poll_seconds;
};
+/*
+ * register shadow for suspend
+ */
+struct dsps_context {
+ u32 control;
+ u32 epintr;
+ u32 coreintr;
+ u32 phy_utmi;
+ u32 mode;
+ u32 tx_mode;
+ u32 rx_mode;
+};
+
/**
* DSPS glue structure.
*/
@@ -121,6 +134,8 @@ struct dsps_glue {
const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
struct timer_list timer; /* otg_workaround timer */
unsigned long last_timer; /* last timer data for each instance */
+
+ struct dsps_context context;
};
/**
@@ -504,6 +519,7 @@ static int dsps_create_musb_pdev(struct dsps_glue *glue,
}
pdata.config = config;
pdata.platform_ops = &dsps_ops;
+ pdata.restore_after_suspend = 1;
config->num_eps = get_int_prop(dn, "mentor,num-eps");
config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
@@ -627,11 +643,55 @@ static const struct of_device_id musb_dsps_of_match[] = {
};
MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
+#ifdef CONFIG_PM
+static int dsps_suspend(struct device *dev)
+{
+ struct dsps_glue *glue = dev_get_drvdata(dev);
+ const struct dsps_musb_wrapper *wrp = glue->wrp;
+ struct musb *musb = platform_get_drvdata(glue->musb);
+ void __iomem *mbase = musb->ctrl_base;
+
+ glue->context.control = dsps_readl(mbase, wrp->control);
+ glue->context.epintr = dsps_readl(mbase, wrp->epintr_set);
+ glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set);
+ glue->context.phy_utmi = dsps_readl(mbase, wrp->phy_utmi);
+ glue->context.mode = dsps_readl(mbase, wrp->mode);
+ glue->context.tx_mode = dsps_readl(mbase, wrp->tx_mode);
+ glue->context.rx_mode = dsps_readl(mbase, wrp->rx_mode);
+
+ return 0;
+}
+
+static int dsps_resume(struct device *dev)
+{
+ struct dsps_glue *glue = dev_get_drvdata(dev);
+ const struct dsps_musb_wrapper *wrp = glue->wrp;
+ struct musb *musb = platform_get_drvdata(glue->musb);
+ void __iomem *mbase = musb->ctrl_base;
+
+ dsps_writel(mbase, wrp->control, glue->context.control);
+ dsps_writel(mbase, wrp->epintr_set, glue->context.epintr);
+ dsps_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
+ dsps_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
+ dsps_writel(mbase, wrp->mode, glue->context.mode);
+ dsps_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
+ dsps_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
+
+ musb->port_reset_state = false;
+ schedule_work(&musb->port_reset_work);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
+
static struct platform_driver dsps_usbss_driver = {
.probe = dsps_probe,
.remove = dsps_remove,
.driver = {
.name = "musb-dsps",
+ .pm = &dsps_pm_ops,
.of_match_table = musb_dsps_of_match,
},
};
--
1.8.3.1
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