Hi On Thu, Jun 27, 2013 at 09:59:35PM +0300, Ruslan Bilovol wrote: > Hello guys, > > On Thu, Jun 27, 2013 at 8:56 PM, Michael Trimarchi > <mich...@amarulasolutions.com> wrote: > > Hi Roger > > > > On Thu, Jun 27, 2013 at 05:49:41PM +0300, Roger Quadros wrote: > >> +Ruslan > >> > >> On 06/27/2013 05:17 PM, Michael Trimarchi wrote: > >> > Hi Roger > >> > > >> > On Thu, Jun 27, 2013 at 04:59:38PM +0300, Roger Quadros wrote: > >> >> Hi Michael, > >> >> > >> >> On 06/27/2013 02:51 PM, Michael Trimarchi wrote: > >> >>> Hi > >> >>> > >> >>> I'm working on omap4460 with two ulpi connected to (SMSC3320 -> HUB > >> >>> SMSC2514) or (TUSB1210 -> HUB SMSC2514). > >> >>> The problem only happen when both port are used and after few suspend > >> >>> resume are triggered. > >> >>> If I use just one port there is no issue on suspend resume. I already > >> >>> covered all TI > >> >>> errata that I know and I'm working on TI kernel. > >> >>> > >> >>> The problem is here > >> >>> > >> >>> [ 77.701934] ehci-omap ehci-omap.0: irq status a004 Async Recl PCD > >> >>> > >> >>> Both ports change status from 001005 to 001009 (you have a log just > >> >>> after). > >> >>> So from host point of view both hub connected are not working in HS > >> >>> mode. > >> >>> After that the omap ehci has gone because the bus can not work in FS > >> >>> and LS and I can not recover from here. > >> >>> Status of transceivers are dumped and they are ok after resume. > >> >>> > >> >>> Do you have any suggestion? > >> >> > >> >> I'm not very sure but both ports suddenly changing state like that look > >> >> like > >> >> a hardware issue. Also, it is strange that you can reproduce it only > >> >> when two > >> >> ports are simultaneously in use. Unfortunately, I can't match your > >> >> setup with 2 ULPI > >> > > >> > Yes I know that TI doesn't have any setup like that. > >> > > >> >> ports. > >> >> > >> >> I have a OMAP5 uEVM that uses 2 ports but it won't be identical to your > >> >> setup as > >> >> they are on HSIC and not ULPI. > >> >> > >> >> Did you try errata i693? > >> > > >> > Yes I have it. It's not clear if I need to wait after > >> > ehci_writel(ehci, temp | PORT_SUSPEND, status_reg); > >> > polling the suspendM of the SMSC or the suspend status of the PORT or I > >> > can > >> > switch just after this instruction. Because TI kernel use an msleep of 4 > >> > mseconds and then switch. It could be a timing issue on how errata is > >> > implemented when I have two ports? How this internal count works? > >> > >> > >> The OMAP EHCI controller transparently sets the suspendM bit of the PHY > >> when you > >> set the PORT_SUSPEND feature on the EHCI port. So you don't need to poll > >> for anything. > >> > > > > A delay is necessary. If we apply the errata to the port before a delay the > > errata > > doesn't work. > > > > /* Use internal 60Mhz clock ULPIBx */ > > temp_reg = omap_readl(L3INIT_HSUSBHOST_CLKCTRL); > > temp_reg |= 1 << (8 + port); > > temp_reg &= ~(1 << (24 + port)); > > omap_writel(temp_reg, L3INIT_HSUSBHOST_CLKCTRL); > > > > /* Wait 2ms to have transceiver transaction */ > > mdelay(2); > > > > /* Use external clock ULPIBx */ > > temp_reg &= ~(1 << (8 + port)); > > temp_reg |= 1 << (24 + port); > > omap_writel(temp_reg, L3INIT_HSUSBHOST_CLKCTRL); > > > > Now it's not clear to me what happen if I apply this clock too early > > (transeceiver still > > driver the clock) or too late. Any clue? > > We need to wait 3ms for entire USB bus to go into suspend after > setting the PORT_SUSPEND bit. During this time, internal OMAP EHCI logic > will communicate with PHY so it is not safe to switch the clocks to > internal source. > That's why with 2ms delay it fails. 4ms delay (3ms + 1ms for safety) > is enough here > and is successfully used last few years for production devices.
Well this mdelay is the switch of the clock and not the delay after PORT_SUSPEND. So after writing PORT_SUSPEND I need to wait 4ms and then in 2ms you have a lot of clock to reach the 18 count. Correct? Anyway I understand, but why both hub connected to the smsc3320 move from HS to FS? So it's not important if there is a drift of delay but it must be >= 4ms. Correct? The code works if I just use one port or remove one hub ;) Now the code is like this: temp &= ~(PORT_WKCONN_E | PORT_RWC_BITS); temp |= PORT_WKDISC_E | PORT_WKOC_E; ehci_writel(ehci, temp | PORT_SUSPEND, status_reg); mdelay(4); omap_ehci_erratum_i693(ehci, ((wIndex & 0xff) - 1)); The code of the function is up on this email. Michael > > -- > Best regards, > Ruslan Bilvol > > > > > > >> What the errata says is that once software sets the PORT_SUSPEND feature, > >> the PHY will > >> got into suspend and cut the PHY clock sooner than required for the EHCI > >> controller to > >> complete its suspend operations. (NOTE: this is only applicable when the > >> PHY is providing the > >> ulpi_clk). > >> > > > > Yes this is the case > > > >> What the workaround does is to just wait for a while (don't know why 4ms), > >> and remux the > >> ulpi_clock to an internal 60MHz clock for a while so that it can complete > >> its suspend operations. > > > > What happen if I apply a big delay after PORT_SUSPEND. Will the internal > > state machine of the omap > > continue to wait the clock? > > > > Michael > > > >> > >> > > >> > First time is 18, and then? > >> > > >> I think it is 18 for every port suspend. > >> > >> >> > >> >> Also, are you suspending and resuming only the USB or the entire system? > >> >> > >> > > >> > Whole system. Right the only susbsytem that doens't go to suspend is the > >> > FSUSB > >> > but this depends on the bootloader. > >> > >> OK. > >> > >> cheers, > >> -roger > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > > the body of a message to majord...@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
