>
> On 12/03/2013 08:37 AM, Peter Chen wrote:
> > At very rare cases, the SoF will not send out after resume with
> > low speed connection. The workaround is do not power down
> > PWD.RXPWD1PT1 bit during the suspend.
>
> Is this also a fix for newly added code? If so please also squash.
>
No, it is a workaround for new problem.
> > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
> > ---
> > drivers/usb/phy/phy-mxs-usb.c | 47
> ++++++++++++++++++++++++++++++++++++++++-
> > 1 files changed, 46 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-
> usb.c
> > index 542b6ec..5ae4a57 100644
> > --- a/drivers/usb/phy/phy-mxs-usb.c
> > +++ b/drivers/usb/phy/phy-mxs-usb.c
> > @@ -69,6 +69,9 @@
> > #define ANADIG_USB2_LOOPBACK_SET 0x244
> > #define ANADIG_USB2_LOOPBACK_CLR 0x248
> >
> > +#define ANADIG_USB1_MISC 0x1f0
> > +#define ANADIG_USB2_MISC 0x250
> > +
> > #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG BIT(12)
> > #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL BIT(11)
> >
> > @@ -80,6 +83,11 @@
> > #define BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 BIT(2)
> > #define BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN BIT(5)
> >
> > +#define BM_ANADIG_USB1_MISC_RX_VPIN_FS BIT(29)
> > +#define BM_ANADIG_USB1_MISC_RX_VMIN_FS BIT(28)
> > +#define BM_ANADIG_USB2_MISC_RX_VPIN_FS BIT(29)
> > +#define BM_ANADIG_USB2_MISC_RX_VMIN_FS BIT(28)
> > +
> > #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
> >
> > /* Do disconnection between PHY and controller without vbus */
> > @@ -296,12 +304,49 @@ static void mxs_phy_shutdown(struct usb_phy *phy)
> > clk_disable_unprepare(mxs_phy->clk);
> > }
> >
> > +static bool mxs_phy_is_low_speed_connection(struct mxs_phy *mxs_phy)
> > +{
> > + unsigned int line_state;
> > + /* bit definition is the same for all controllers */
> > + unsigned int dp_bit = BM_ANADIG_USB1_MISC_RX_VPIN_FS,
> > + dm_bit = BM_ANADIG_USB1_MISC_RX_VMIN_FS;
> > + unsigned int reg = ANADIG_USB1_MISC;
> > +
> > + /* If the SoCs don't have anatop, quit */
> > + if (!mxs_phy->regmap_anatop)
> > + return false;
> > +
> > + if (mxs_phy->port_id == 0)
> > + reg = ANADIG_USB1_MISC;
> > + else if (mxs_phy->port_id == 1)
> > + reg = ANADIG_USB2_MISC;
> > +
> > + regmap_read(mxs_phy->regmap_anatop, reg, &line_state);
> > +
> > + if ((line_state & (dp_bit | dm_bit)) == dm_bit)
> > + return true;
> > + else
> > + return false;
> > +}
> > +
> > static int mxs_phy_suspend(struct usb_phy *x, int suspend)
> > {
> > struct mxs_phy *mxs_phy = to_mxs_phy(x);
> > + bool low_speed_connection, vbus_is_on;
> > +
> > + low_speed_connection = mxs_phy_is_low_speed_connection(mxs_phy);
> > + vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);
> >
> > if (suspend) {
> > - writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
> > + /*
> > + * FIXME: Do not power down RXPWD1PT1 bit for low speed
>
> Is this FIXME still true?
Yes, still not find the root cause.
Peter
>
> > + * connect. The low speed connection will have problem at
> > + * very rare cases during usb suspend and resume process.
> > + */
> > + if (low_speed_connection & vbus_is_on)
> > + writel(0xfffbffff, x->io_priv + HW_USBPHY_PWD);
> > + else
> > + writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
> > writel(BM_USBPHY_CTRL_CLKGATE,
> > x->io_priv + HW_USBPHY_CTRL_SET);
> > clk_disable_unprepare(mxs_phy->clk);
> >
>
> Marc
>
> --
> Pengutronix e.K. | Marc Kleine-Budde |
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