usb: musb: finish suspend/reset work independently from musb_hub_control()
Currently, resume and reset is completed when the USB core calls back
the root hub, asking for the port's state. This results in
unpredictable timing of state assertion, which in turn renders some
USB devices unusable after resume.
Fix this by moving the logic to end the reset and suspend state out of
musb_hub_control() into separate functions called from delayed workers.
GetPortStatus only reports the current state now, without taking any
real action.
The rh_timeout variable is kept in order to define a minimum time gap
between reset and resume only.
FWIW, in my case, a Verbatim "STORE N GO" mass storage device won't
resume cleanly without this patch.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 1ecdb94..0e7f4a0 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -478,8 +478,8 @@
musb->port1_status |=
(USB_PORT_STAT_C_SUSPEND << 16)
| MUSB_PORT_STAT_RESUME;
- musb->rh_timer = jiffies
- + msecs_to_jiffies(20);
+ schedule_delayed_work(
+ &musb->finish_resume_work, 20);
musb->xceiv->state = OTG_STATE_A_HOST;
musb->is_active = 1;
@@ -1813,6 +1813,21 @@
musb_host_free(musb);
}
+static void musb_deassert_reset(struct work_struct *work)
+{
+ struct musb *musb;
+ unsigned long flags;
+
+ musb = container_of(work, struct musb, deassert_reset_work.work);
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ if (musb->port1_status & USB_PORT_STAT_RESET)
+ musb_port_reset(musb, false);
+
+ spin_unlock_irqrestore(&musb->lock, flags);
+}
+
/*
* Perform generic per-controller initialization.
*
@@ -1897,6 +1912,8 @@
/* Init IRQ workqueue before request_irq */
INIT_WORK(&musb->irq_work, musb_irq_work);
+ INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
+ INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
/* setup musb parts of the core (especially endpoints) */
status = musb_core_init(plat->config->multipoint
@@ -1990,6 +2007,8 @@
fail3:
cancel_work_sync(&musb->irq_work);
+ cancel_delayed_work_sync(&musb->finish_resume_work);
+ cancel_delayed_work_sync(&musb->deassert_reset_work);
if (musb->dma_controller)
dma_controller_destroy(musb->dma_controller);
fail2_5:
@@ -2053,6 +2072,8 @@
dma_controller_destroy(musb->dma_controller);
cancel_work_sync(&musb->irq_work);
+ cancel_delayed_work_sync(&musb->finish_resume_work);
+ cancel_delayed_work_sync(&musb->deassert_reset_work);
musb_free(musb);
device_init_wakeup(dev, 0);
return 0;
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index 29f7cd7..7083e82 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -47,6 +47,7 @@
#include <linux/usb/otg.h>
#include <linux/usb/musb.h>
#include <linux/phy/phy.h>
+#include <linux/workqueue.h>
struct musb;
struct musb_hw_ep;
@@ -295,6 +296,8 @@
irqreturn_t (*isr)(int, void *);
struct work_struct irq_work;
+ struct delayed_work deassert_reset_work;
+ struct delayed_work finish_resume_work;
u16 hwvers;
u16 intrrxe;
diff --git a/drivers/usb/musb/musb_host.h b/drivers/usb/musb/musb_host.h
index 7436c24..909ba49 100644
--- a/drivers/usb/musb/musb_host.h
+++ b/drivers/usb/musb/musb_host.h
@@ -94,6 +94,7 @@
extern void musb_host_poke_root_hub(struct musb *musb);
extern void musb_port_suspend(struct musb *musb, bool do_suspend);
extern void musb_port_reset(struct musb *musb, bool do_reset);
+extern void musb_host_finish_resume(struct work_struct *work);
#else
static inline struct musb *hcd_to_musb(struct usb_hcd *hcd)
{
@@ -125,6 +126,7 @@
static inline void musb_host_poke_root_hub(struct musb *musb) {}
static inline void musb_port_suspend(struct musb *musb, bool do_suspend) {}
static inline void musb_port_reset(struct musb *musb) {}
+static inline void musb_host_finish_resume(struct work_struct *work) {}
#endif
struct usb_hcd;
diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index 24e46c0..ad417fd 100644
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -44,6 +44,37 @@
#include "musb_core.h"
+void musb_host_finish_resume(struct work_struct *work)
+{
+ struct musb *musb;
+ unsigned long flags;
+ u8 power;
+
+ musb = container_of(work, struct musb, deassert_reset_work.work);
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ power = musb_readb(musb->mregs, MUSB_POWER);
+ power &= ~MUSB_POWER_RESUME;
+ dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
+ power);
+ musb_writeb(musb->mregs, MUSB_POWER, power);
+
+ /*
+ * ISSUE: DaVinci (RTL 1.300) disconnects after
+ * resume of high speed peripherals (but not full
+ * speed ones).
+ */
+ musb->is_active = 1;
+ musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
+ musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
+ usb_hcd_poll_rh_status(musb->hcd);
+ /* NOTE: it might really be A_WAIT_BCON ... */
+ musb->xceiv->state = OTG_STATE_A_HOST;
+
+ spin_unlock_irqrestore(&musb->lock, flags);
+}
+
void musb_port_suspend(struct musb *musb, bool do_suspend)
{
struct usb_otg *otg = musb->xceiv->otg;
@@ -105,7 +136,7 @@
/* later, GetPortStatus will stop RESUME signaling */
musb->port1_status |= MUSB_PORT_STAT_RESUME;
- musb->rh_timer = jiffies + msecs_to_jiffies(20);
+ schedule_delayed_work(&musb->finish_resume_work, 20);
}
}
@@ -150,7 +181,7 @@
musb->port1_status |= USB_PORT_STAT_RESET;
musb->port1_status &= ~USB_PORT_STAT_ENABLE;
- musb->rh_timer = jiffies + msecs_to_jiffies(50);
+ schedule_delayed_work(&musb->deassert_reset_work, 50);
} else {
dev_dbg(musb->controller, "root port reset stopped\n");
musb_writeb(mbase, MUSB_POWER,
@@ -325,36 +356,6 @@
if (wIndex != 1)
goto error;
- /* finish RESET signaling? */
- if ((musb->port1_status & USB_PORT_STAT_RESET)
- && time_after_eq(jiffies, musb->rh_timer))
- musb_port_reset(musb, false);
-
- /* finish RESUME signaling? */
- if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
- && time_after_eq(jiffies, musb->rh_timer)) {
- u8 power;
-
- power = musb_readb(musb->mregs, MUSB_POWER);
- power &= ~MUSB_POWER_RESUME;
- dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
- power);
- musb_writeb(musb->mregs, MUSB_POWER, power);
-
- /* ISSUE: DaVinci (RTL 1.300) disconnects after
- * resume of high speed peripherals (but not full
- * speed ones).
- */
-
- musb->is_active = 1;
- musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
- | MUSB_PORT_STAT_RESUME);
- musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
- usb_hcd_poll_rh_status(musb->hcd);
- /* NOTE: it might really be A_WAIT_BCON ... */
- musb->xceiv->state = OTG_STATE_A_HOST;
- }
-
put_unaligned(cpu_to_le32(musb->port1_status
& ~MUSB_PORT_STAT_RESUME),
(__le32 *) buf);