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

From: Roger Quadros
Date: Mon Dec 02 2013 - 04:42:16 EST

Michael,

On 11/29/2013 05:32 PM, Michael Trimarchi 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.
>>
>
> Do you think that we need something similar of usb musb?
> I have seen the OTG_SYSCONFIG is touched in uboot and
> only readed in omap2430.c.

I'm not sure about musb. Maybe Sebastian/Felipe have better idea.
In general I believe that all modules must be reset by the kernel.

cheers,
-roger
>
>> 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;
>> }
>>
>> +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);
>> + 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
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/