Currently musb_platform_reset() is only used by dsps. In case of BABBLE interrupt for other platforms the musb_platform_reset() is a NOP. In such situations no need to re-initialize the endpoints. Also in the latest silicon revision of AM335x, we do have a babble recovery mechanism without resetting the IP block. In preperation to add that support its better to have a rest_done return for musb_platform_reset().
Signed-off-by: George Cherian <george.cher...@ti.com> --- drivers/usb/musb/musb_core.c | 10 ++++++---- drivers/usb/musb/musb_core.h | 10 ++++++---- drivers/usb/musb/musb_dsps.c | 3 ++- 3 files changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 8920b80..7c6836cc 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -1755,9 +1755,11 @@ static void musb_irq_work(struct work_struct *data) static void musb_recover_work(struct work_struct *data) { struct musb *musb = container_of(data, struct musb, recover_work.work); - int status; + int status, ret; - musb_platform_reset(musb); + ret = musb_platform_reset(musb); + if (ret) + return; usb_phy_vbus_off(musb->xceiv); usleep_range(100, 200); @@ -1766,8 +1768,8 @@ static void musb_recover_work(struct work_struct *data) usleep_range(100, 200); /* - * When a babble condition occurs, the musb controller removes the - * session bit and the endpoint config is lost. + * When a babble condition occurs, the musb controller + * removes the session bit and the endpoint config is lost. */ if (musb->dyn_fifo) status = ep_config_from_table(musb); diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h index 9241025..414e57a 100644 --- a/drivers/usb/musb/musb_core.h +++ b/drivers/usb/musb/musb_core.h @@ -192,7 +192,7 @@ struct musb_platform_ops { int (*set_mode)(struct musb *musb, u8 mode); void (*try_idle)(struct musb *musb, unsigned long timeout); - void (*reset)(struct musb *musb); + int (*reset)(struct musb *musb); int (*vbus_status)(struct musb *musb); void (*set_vbus)(struct musb *musb, int on); @@ -555,10 +555,12 @@ static inline void musb_platform_try_idle(struct musb *musb, musb->ops->try_idle(musb, timeout); } -static inline void musb_platform_reset(struct musb *musb) +static inline int musb_platform_reset(struct musb *musb) { - if (musb->ops->reset) - musb->ops->reset(musb); + if (!musb->ops->reset) + return -EINVAL; + + return musb->ops->reset(musb); } static inline int musb_platform_get_vbus_status(struct musb *musb) diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c index 74c4193..f6f3087 100644 --- a/drivers/usb/musb/musb_dsps.c +++ b/drivers/usb/musb/musb_dsps.c @@ -536,7 +536,7 @@ static int dsps_musb_set_mode(struct musb *musb, u8 mode) return 0; } -static void dsps_musb_reset(struct musb *musb) +static int dsps_musb_reset(struct musb *musb) { struct device *dev = musb->controller; struct dsps_glue *glue = dev_get_drvdata(dev->parent); @@ -548,6 +548,7 @@ static void dsps_musb_reset(struct musb *musb) usleep_range(100, 200); usb_phy_init(musb->xceiv); + return 0; } static struct musb_platform_ops dsps_ops = { -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html