On Fri, Mar 24, 2023, Roger Quadros wrote:
> Explicitly set and clear wakeup config so we don't leave anything
> to chance.
>
> Clear wakeup status on suspend so we know what caused wake up.
>
> The LINESTATE wake up should not be enabled in device mode
> if we are not connected to a USB host and in USB suspend (U2/L3)
> else it will cause spurious wake up.
>
> For now, don't enable LINESTATE. This means wake up from
> USB resume will not work but at least we won't have any spurious
> wake ups.
>
> Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx>
> ---
> Changelog:
> v2: don't enable LINESTATE wake-up at all in device mode.
>
> drivers/usb/dwc3/dwc3-am62.c | 28 ++++++++++++++++++----------
> 1 file changed, 18 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c
> index 859b48279658..b22fb78bc8e7 100644
> --- a/drivers/usb/dwc3/dwc3-am62.c
> +++ b/drivers/usb/dwc3/dwc3-am62.c
> @@ -60,6 +60,13 @@
> #define USBSS_WAKEUP_CFG_SESSVALID_EN BIT(1)
> #define USBSS_WAKEUP_CFG_VBUSVALID_EN BIT(0)
>
> +#define USBSS_WAKEUP_CFG_ALL (USBSS_WAKEUP_CFG_VBUSVALID_EN | \
> + USBSS_WAKEUP_CFG_SESSVALID_EN | \
> + USBSS_WAKEUP_CFG_LINESTATE_EN | \
> + USBSS_WAKEUP_CFG_OVERCURRENT_EN)
> +
> +#define USBSS_WAKEUP_CFG_NONE 0
> +
> /* WAKEUP STAT register bits */
> #define USBSS_WAKEUP_STAT_OVERCURRENT BIT(4)
> #define USBSS_WAKEUP_STAT_LINESTATE BIT(3)
> @@ -103,6 +110,7 @@ struct dwc3_data {
> struct regmap *syscon;
> unsigned int offset;
> unsigned int vbus_divider;
> + u32 wakeup_stat;
> };
>
> static const int dwc3_ti_rate_table[] = { /* in KHZ */
> @@ -302,12 +310,17 @@ static int dwc3_ti_suspend_common(struct device *dev)
> /* Set wakeup config enable bits */
> reg = dwc3_ti_readl(data, USBSS_WAKEUP_CONFIG);
> if (current_prtcap_dir == DWC3_GCTL_PRTCAP_HOST) {
> - reg |= USBSS_WAKEUP_CFG_LINESTATE_EN | USBSS_WAKEUP_CFG_OVERCURRENT_EN;
> + reg = USBSS_WAKEUP_CFG_LINESTATE_EN | USBSS_WAKEUP_CFG_OVERCURRENT_EN;
> } else {
> - reg |= USBSS_WAKEUP_CFG_OVERCURRENT_EN | USBSS_WAKEUP_CFG_LINESTATE_EN |
> - USBSS_WAKEUP_CFG_VBUSVALID_EN;
> + reg = USBSS_WAKEUP_CFG_VBUSVALID_EN | USBSS_WAKEUP_CFG_SESSVALID_EN;
> + /*
> + * Enable LINESTATE wake up only if connected to bus
> + * and in U2/L3 state else it causes spurious wake-up.
> + */
> }
> dwc3_ti_writel(data, USBSS_WAKEUP_CONFIG, reg);
> + /* clear wakeup status so we know what caused the wake up */
> + dwc3_ti_writel(data, USBSS_WAKEUP_STAT, USBSS_WAKEUP_STAT_CLR);
> }
>
> clk_disable_unprepare(data->usb2_refclk);
> @@ -324,16 +337,11 @@ static int dwc3_ti_resume_common(struct device *dev)
>
> if (device_may_wakeup(dev)) {
> /* Clear wakeup config enable bits */
> - reg = dwc3_ti_readl(data, USBSS_WAKEUP_CONFIG);
> - reg &= ~(USBSS_WAKEUP_CFG_OVERCURRENT_EN | USBSS_WAKEUP_CFG_LINESTATE_EN |
> - USBSS_WAKEUP_CFG_VBUSVALID_EN);
> - dwc3_ti_writel(data, USBSS_WAKEUP_CONFIG, reg);
> + dwc3_ti_writel(data, USBSS_WAKEUP_CONFIG, USBSS_WAKEUP_CFG_NONE);
> }
>
> reg = dwc3_ti_readl(data, USBSS_WAKEUP_STAT);
> - /* Clear the wakeup status with wakeup clear bit */
> - reg |= USBSS_WAKEUP_STAT_CLR;
> - dwc3_ti_writel(data, USBSS_WAKEUP_STAT, reg);
> + data->wakeup_stat = reg;
>
> return 0;
> }
> --
> 2.34.1
>
Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Thanks,
Thinh
