On Fri, 5 Feb 2021 20:12:05 +0100 Pali Rohár <p...@kernel.org> wrote:
> Interrupt for EP0 is indicated in intrtx register via first bit. It
> is set for both RX and TX. First bit in intrrx register is reserved
> and not set.
>
> So remove calling musb_peri_ep0() function at every iteration of
> udc_irq() and musb_peri_rx() and call it only from musb_peri_tx()
> when correct interrupt bit in initrtx it set.
>
> Address from SET ADDRESS command must be set to faddr register only
> after acknowledging SERV_RXPKTRDY followed by received EP0 interrupt.
> So prior calling musb_peri_ep0_set_address() check for EP0 interrupt
> instead of (incorrect) MUSB_INTR_SOF interrupt.
>
> This patch fixes issue that host (computer) cannot register U-Boot USB
> device and failing with errors:
>
> usb 1-1: new full-speed USB device number 86 using xhci_hcd
> usb 1-1: Device not responding to setup address.
> usb 1-1: Device not responding to setup address.
> usb 1-1: device not accepting address 86, error -71
>
> U-Boot was writing address to faddr register too early and did not
> wait for correct interrupt after which should update address.
>
Reviewed-by: Lukasz Majewski <lu...@denx.de>
> Signed-off-by: Pali Rohár <p...@kernel.org>
> ---
> drivers/usb/musb/musb_udc.c | 12 ++++--------
> 1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/usb/musb/musb_udc.c b/drivers/usb/musb/musb_udc.c
> index 7c74422623..50d8bc319c 100644
> --- a/drivers/usb/musb/musb_udc.c
> +++ b/drivers/usb/musb/musb_udc.c
> @@ -707,9 +707,7 @@ static void musb_peri_rx(u16 intr)
> {
> unsigned int ep;
>
> - /* Check for EP0 */
> - if (0x01 & intr)
> - musb_peri_ep0();
> + /* First bit is reserved and does not indicate interrupt for
> EP0 */
> for (ep = 1; ep < 16; ep++) {
> if ((1 << ep) & intr)
> @@ -721,9 +719,9 @@ static void musb_peri_tx(u16 intr)
> {
> unsigned int ep;
>
> - /* Check for EP0 */
> + /* Check for EP0: first bit indicates interrupt for both RX
> and TX */ if (0x01 & intr)
> - musb_peri_ep0_tx();
> + musb_peri_ep0();
>
> for (ep = 1; ep < 16; ep++) {
> if ((1 << ep) & intr)
> @@ -750,8 +748,6 @@ void udc_irq(void)
> musb_peri_resume();
> }
>
> - musb_peri_ep0();
> -
> if (MUSB_INTR_RESET & intrusb) {
> usbd_device_event_irq(udc_device,
> DEVICE_RESET, 0); musb_peri_reset();
> @@ -790,7 +786,7 @@ void udc_irq(void)
> if (intrtx)
> musb_peri_tx(intrtx);
> } else {
> - if (MUSB_INTR_SOF & intrusb) {
> + if (readw(&musbr->intrtx) & 0x1) {
> u8 faddr;
> faddr = readb(&musbr->faddr);
> /*
Best regards,
Lukasz Majewski
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lu...@denx.de
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