Re: [PATCH 1/1] mfd: omap-usb-host: Fix USB device detection problems on OMAP4 Panda

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Hi

On Sat, Nov 30, 2013 at 6:10 AM, Michael Trimarchi
<michael@xxxxxxxxxxxxxxxxxxxx> wrote:
> Hi
>
> On Sat, Nov 30, 2013 at 5:48 AM, Michael Trimarchi
> <michael@xxxxxxxxxxxxxxxxxxxx> wrote:
>> Hi Roger
>>
>> On Fri, Nov 29, 2013 at 2:01 PM, Roger Quadros <rogerq@xxxxxx> wrote:
>>> With u-boot 2013.10, USB devices are sometimes not detected
>>> on OMAP4 Panda. To make us independent of what bootloader does
>>> with the USB Host module, we must RESET it to get it to a known
>>> good state. This patch Soft RESETs the USB Host module.
>>>
>>> Reported-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
>>> Cc: <stable@xxxxxxxxxxxxxxx> # 3.10+
>>> Signed-off-by: Roger Quadros <rogerq@xxxxxx>
>>> ---
>>>  drivers/mfd/omap-usb-host.c | 115 +++++++++++++++++++++++++++++++++++++++++---
>>>  1 file changed, 109 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
>>> index 142650f..d4bd464 100644
>>> --- a/drivers/mfd/omap-usb-host.c
>>> +++ b/drivers/mfd/omap-usb-host.c
>>> @@ -43,14 +43,18 @@
>>>  /* UHH Register Set */
>>>  #define        OMAP_UHH_REVISION                               (0x00)
>>>  #define        OMAP_UHH_SYSCONFIG                              (0x10)
>>> -#define        OMAP_UHH_SYSCONFIG_MIDLEMODE                    (1 << 12)
>>> +#define        OMAP_UHH_SYSCONFIG_MIDLEMASK                    (3 << 12)
>>> +#define OMAP_UHH_SYSCONFIG_MIDLESHIFT                  (12)
>>>  #define        OMAP_UHH_SYSCONFIG_CACTIVITY                    (1 << 8)
>>> -#define        OMAP_UHH_SYSCONFIG_SIDLEMODE                    (1 << 3)
>>> +#define        OMAP_UHH_SYSCONFIG_SIDLEMASK                    (3 << 3)
>>> +#define        OMAP_UHH_SYSCONFIG_SIDLESHIFT                   (3)
>>>  #define        OMAP_UHH_SYSCONFIG_ENAWAKEUP                    (1 << 2)
>>>  #define        OMAP_UHH_SYSCONFIG_SOFTRESET                    (1 << 1)
>>>  #define        OMAP_UHH_SYSCONFIG_AUTOIDLE                     (1 << 0)
>>>
>>>  #define        OMAP_UHH_SYSSTATUS                              (0x14)
>>> +#define OMAP_UHH_SYSSTATUS_RESETDONE                   (1 << 0)
>>> +
>>>  #define        OMAP_UHH_HOSTCONFIG                             (0x40)
>>>  #define        OMAP_UHH_HOSTCONFIG_ULPI_BYPASS                 (1 << 0)
>>>  #define        OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS              (1 << 0)
>>> @@ -66,10 +70,10 @@
>>>  #define OMAP4_UHH_HOSTCONFIG_APP_START_CLK             (1 << 31)
>>>
>>>  /* OMAP4-specific defines */
>>> -#define OMAP4_UHH_SYSCONFIG_IDLEMODE_CLEAR             (3 << 2)
>>> -#define OMAP4_UHH_SYSCONFIG_NOIDLE                     (1 << 2)
>>> -#define OMAP4_UHH_SYSCONFIG_STDBYMODE_CLEAR            (3 << 4)
>>> -#define OMAP4_UHH_SYSCONFIG_NOSTDBY                    (1 << 4)
>>> +#define OMAP4_UHH_SYSCONFIG_MIDLEMASK                  (3 << 2)
>>> +#define OMAP4_UHH_SYSCONFIG_MIDLESHIFT                 (2)
>>> +#define OMAP4_UHH_SYSCONFIG_SIDLEMASK                  (3 << 4)
>>> +#define OMAP4_UHH_SYSCONFIG_SIDLESHIFT                 (4)
>>>  #define OMAP4_UHH_SYSCONFIG_SOFTRESET                  (1 << 0)
>>>
>>>  #define OMAP4_P1_MODE_CLEAR                            (3 << 16)
>>> @@ -81,6 +85,12 @@
>>>
>>>  #define        OMAP_UHH_DEBUG_CSR                              (0x44)
>>>
>>> +/* MIDLE modes */
>>> +#define OMAP_UHH_SYSCONFIG_MIDLE_NOSTANDBY             (1)
>>> +
>>> +/* SIDLE modes */
>>> +#define OMAP_UHH_SYSCONFIG_SIDLE_NOIDLE                        (1)
>>> +
>>>  /* Values of UHH_REVISION - Note: these are not given in the TRM */
>>>  #define OMAP_USBHS_REV1                0x00000010      /* OMAP3 */
>>>  #define OMAP_USBHS_REV2                0x50700100      /* OMAP4 */
>>> @@ -474,6 +484,97 @@ static unsigned omap_usbhs_rev2_hostconfig(struct usbhs_hcd_omap *omap,
>>>         return reg;
>>>  }
>>>
>>
>> I'm digging in the code but as I understand this should be done by
>> omap_hwmod and
>> i660 avoid reset of the ehci module. This is done by ocp_softreset?
>>
>>
>>> +static void omap_usbhs_rev1_reset(struct device *dev)
>>> +{
>>> +       struct usbhs_hcd_omap *omap = dev_get_drvdata(dev);
>>> +       u32 reg;
>>> +       unsigned long timeout;
>>> +
>>> +       reg = usbhs_read(omap->uhh_base, OMAP_UHH_SYSCONFIG);
>>> +
>>> +       /* Soft Reset */
>>> +       usbhs_write(omap->uhh_base, OMAP_UHH_SYSCONFIG,
>>> +                   reg | OMAP_UHH_SYSCONFIG_SOFTRESET);
>>> +
>>> +       timeout = jiffies + msecs_to_jiffies(100);
>>> +       while (!(usbhs_read(omap->uhh_base, OMAP_UHH_SYSSTATUS)
>>> +                       & OMAP_UHH_SYSSTATUS_RESETDONE)) {
>>> +               cpu_relax();
>>> +
>>> +               if (time_after(jiffies, timeout)) {
>>> +                       dev_err(dev, "Soft RESET operation timed out\n");
>>> +                       break;
>>> +               }
>>> +       }
>>> +
>>> +       /* Set No-Standby */
>>> +       reg &= ~OMAP_UHH_SYSCONFIG_MIDLEMASK;
>>> +       reg |= OMAP_UHH_SYSCONFIG_MIDLE_NOSTANDBY
>>> +               << OMAP_UHH_SYSCONFIG_MIDLESHIFT;
>>> +
>>> +       /* Set No-Idle */
>>> +       reg &= ~OMAP_UHH_SYSCONFIG_SIDLEMASK;
>>> +       reg |= OMAP_UHH_SYSCONFIG_SIDLE_NOIDLE
>>> +               << OMAP_UHH_SYSCONFIG_SIDLESHIFT;
>>> +
>>> +       usbhs_write(omap->uhh_base, OMAP_UHH_SYSCONFIG, reg);
>>> +}
>>> +
>>> +static void omap_usbhs_rev2_reset(struct device *dev)
>>> +{
>>> +       struct usbhs_hcd_omap *omap = dev_get_drvdata(dev);
>>> +       u32 reg;
>>> +       unsigned long timeout;
>>> +
>>> +       reg = usbhs_read(omap->uhh_base, OMAP_UHH_SYSCONFIG);
>>> +
>>> +       /* Soft Reset */
>>> +       usbhs_write(omap->uhh_base, OMAP_UHH_SYSCONFIG,
>>> +                   reg | OMAP4_UHH_SYSCONFIG_SOFTRESET);
>>> +
>>> +       /* OMAP4: Need to wait before SYSCONFIG can be accessed */
>>> +       udelay(2);
>>
>> is this the srst_udelay?
>>
>
> In omap_hwmod.c
>
> _write_sysconfig_raw(v, oh);
>
> is done after ask a reset
>
>         if (oh->class->sysc->srst_udelay)
>                 udelay(oh->class->sysc->srst_udelay);
>
> Should be done after the reset completion?
>

My apologize  _set_softreset not set nothing but just prepare it.

Forget about it

> Michael
>
>> Michael
>>
>>> +       timeout = jiffies + msecs_to_jiffies(100);
>>> +
>>> +       /* SOFTRESET bit clears when RESET completes */
>>> +       while (usbhs_read(omap->uhh_base, OMAP_UHH_SYSCONFIG)
>>> +                       & OMAP4_UHH_SYSCONFIG_SOFTRESET) {
>>> +               cpu_relax();
>>> +
>>> +               if (time_after(jiffies, timeout)) {
>>> +                       dev_err(dev, "Soft RESET operation timed out\n");
>>> +                       break;
>>> +               }
>>> +       }
>>> +
>>> +       /* Set No-Standby */
>>> +       reg &= ~OMAP4_UHH_SYSCONFIG_MIDLEMASK;
>>> +       reg |= OMAP_UHH_SYSCONFIG_MIDLE_NOSTANDBY
>>> +               << OMAP4_UHH_SYSCONFIG_MIDLESHIFT;
>>> +
>>> +       /* Set No-Idle */
>>> +       reg &= ~OMAP4_UHH_SYSCONFIG_SIDLEMASK;
>>> +       reg |= OMAP_UHH_SYSCONFIG_SIDLE_NOIDLE
>>> +               << OMAP4_UHH_SYSCONFIG_SIDLESHIFT;
>>> +
>>> +       usbhs_write(omap->uhh_base, OMAP_UHH_SYSCONFIG, reg);
>>> +}
>>> +
>>> +static void omap_usbhs_softreset(struct device *dev)
>>> +{
>>> +       struct usbhs_hcd_omap *omap = dev_get_drvdata(dev);
>>> +
>>> +       switch (omap->usbhs_rev) {
>>> +       case OMAP_USBHS_REV1:
>>> +               omap_usbhs_rev1_reset(dev);
>>> +               break;
>>> +
>>> +       default:        /* Rev 2 onwards */
>>> +               omap_usbhs_rev2_reset(dev);
>>> +               break;
>>> +       }
>>> +}
>>> +
>>>  static void omap_usbhs_init(struct device *dev)
>>>  {
>>>         struct usbhs_hcd_omap           *omap = dev_get_drvdata(dev);
>>> @@ -483,6 +584,8 @@ static void omap_usbhs_init(struct device *dev)
>>>
>>>         pm_runtime_get_sync(dev);
>>>
>>> +       omap_usbhs_softreset(dev);
>>> +
>>>         reg = usbhs_read(omap->uhh_base, OMAP_UHH_HOSTCONFIG);
>>>         /* setup ULPI bypass and burst configurations */
>>>         reg |= (OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN
>>> --
>>> 1.8.3.2
>>>
>>> --
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