On 09/22/2016 04:54 PM, Bin Liu wrote:

On Thu, Sep 22, 2016 at 02:19:00PM +0300, Hans de Goede wrote:
The musb-core now a days always treats babble errors in host mode

I don't think this statement is accurate. You might want to change it to
"The musb core already handles babble interrupt" or something else.

It is accurate if you look in the history at drivers/usb/musb
commits around 15-03-10 you will see 2 relevant commits:


"usb: musb: core: simplify musb_recover_work()"

This commits introduces calling musb_root_disconnect(musb)
on babble errors, that was not happening before which is why
I added the custom babble error handling. to the sunxi glue.


"usb: musb: core: always try to recover from babble"

Where the title says it all.

Take these together and I believe that my commit msg:

"The musb-core now a days always treats babble errors in host mode
as disconnects, so there is no need for the sunxi specific handling
of this anymore."

Is quite accurate.



Signed-off-by: Hans de Goede <hdego...@redhat.com>
Changes in v2:
-This is a new patch in v2 of this patch series
 drivers/usb/musb/sunxi.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
index 1408245..82eba92 100644
--- a/drivers/usb/musb/sunxi.c
+++ b/drivers/usb/musb/sunxi.c
@@ -186,16 +186,6 @@ static irqreturn_t sunxi_musb_interrupt(int irq, void 
        if (musb->int_usb)
                writeb(musb->int_usb, musb->mregs + SUNXI_MUSB_INTRUSB);

-       /*
-        * sunxi musb often signals babble on low / full speed device
-        * disconnect, without ever raising MUSB_INTR_DISCONNECT, since
-        * normally babble never happens treat it as disconnect.
-        */
-       if ((musb->int_usb & MUSB_INTR_BABBLE) && is_host_active(musb)) {
-               musb->int_usb &= ~MUSB_INTR_BABBLE;
-               musb->int_usb |= MUSB_INTR_DISCONNECT;
-       }
        if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
                /* ep0 FADDR must be 0 when (re)entering peripheral mode */
                musb_ep_select(musb->mregs, 0);

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