usb: musb: dsps: do not reset musb on babble

All we have to do is, really, drop session bit
and let the session restart.

Big thanks goes to Bin Liu <b-liu@ti.com> for
inspiring this work.

Tested-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 2 insertions, 21 deletions

diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 85ebfa2c3858..a159de1225f3 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -604,31 +604,12 @@ static int dsps_musb_reset(struct musb *musb)
 {
         struct device *dev = musb->controller;
         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
-        const struct dsps_musb_wrapper *wrp = glue->wrp;
-        int session_restart = 0, error;
+        int session_restart = 0;
 
         if (glue->sw_babble_enabled)
                 session_restart = dsps_sw_babble_control(musb);
-        /*
-         * In case of new silicon version babble condition can be recovered
-         * without resetting the MUSB. But for older silicon versions, MUSB
-         * reset is needed
-         */
-        if (session_restart || !glue->sw_babble_enabled) {
-                dev_info(musb->controller, "Restarting MUSB to recover from Babble\n");
-                dsps_writel(musb->ctrl_base, wrp->control, (1 << wrp->reset));
-                usleep_range(100, 200);
-                usb_phy_shutdown(musb->xceiv);
-                error = phy_power_off(musb->phy);
-                if (error)
-                        dev_err(dev, "phy shutdown failed: %i\n", error);
-                usleep_range(100, 200);
-                usb_phy_init(musb->xceiv);
-                error = phy_power_on(musb->phy);
-                if (error)
-                        dev_err(dev, "phy powerup failed: %i\n", error);
+        else
                 session_restart = 1;
-        }
 
         return session_restart ? 0 : -EPIPE;
 }