usb: musb: start session in resume for host port

Commit 17539f2f4f0b ("usb: musb: fix enumeration after resume") replaced
musb_start() in musb_resume() to not override softconnect bit, but it
doesn't restart the session for host port which was done in musb_start().
The session could be disabled in musb_suspend(), which leads the host
port doesn't stay in host mode.

So let's start the session specifically for host port in musb_resume().

Fixes: 17539f2f4f0b ("usb: musb: fix enumeration after resume")

Cc: stable@vger.kernel.org
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200525025049.3400-3-b-liu@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index d590110..48178ae 100644 (file)
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2877,6 +2877,13 @@ static int musb_resume(struct device *dev)
        musb_enable_interrupts(musb);
        musb_platform_enable(musb);
 
+       /* session might be disabled in suspend */
+       if (musb->port_mode == MUSB_HOST &&
+           !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) {
+               devctl |= MUSB_DEVCTL_SESSION;
+               musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+       }
+
        spin_lock_irqsave(&musb->lock, flags);
        error = musb_run_resume_work(musb);
        if (error)