@@ -1015,13 +1015,20 @@ static int dsps_suspend(struct device *dev)
const struct dsps_musb_wrapper *wrp = glue->wrp;
struct musb *musb = platform_get_drvdata(glue->musb);
void __iomem *mbase;
-
- del_timer_sync(&glue->timer);
+ int ret;
if (!musb)
/* This can happen if the musb device is in -EPROBE_DEFER */
return 0;
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ return ret;
+ }
+
+ del_timer_sync(&glue->timer);
+
mbase = musb->ctrl_base;
glue->context.control = musb_readl(mbase, wrp->control);
glue->context.epintr = musb_readl(mbase, wrp->epintr_set);
@@ -1060,6 +1067,8 @@ static int dsps_resume(struct device *dev)
musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
dsps_mod_timer(glue, -1);
+ pm_runtime_put(dev);
+
return 0;
}
#endif
The musb_dsps driver is special in that the parent (glue) device's driver is accessing registers mapped by the child. The clock is however shared and is managed by the grandparent device. Since commit 869c59782981 ("usb: musb: dsps: add support for suspend and resume") the dsps driver has been accessing these registers as part of suspend and resume. The parent driver obviously cannot runtime resume the child during system suspend and is currently relying on the fact that the child will be RPM_ACTIVE throughout suspend. The suspend implementation also makes sure to check that the child is indeed present (and hence the clock enabled) before accessing the registers. Let's add an explicit runtime resume of the glue device itself to enable the clock before doing the register accesses in case these assumptions ever change (i.e. if the child is left runtime suspended). Note that the glue-timer cancellation is moved after the child-presence check to keep error handling simple. This should be fine as the timer is not setup until the controller is being registered and at that time glue->musb and its driver data have already been initialised. Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Daniel Mack <zonque@gmail.com> Cc: Tony Lindgren <tony@atomide.com> Signed-off-by: Johan Hovold <johan@kernel.org> --- drivers/usb/musb/musb_dsps.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)