Hi Roger On Thu, Jun 27, 2013 at 11:07:11PM +0300, Ruslan Bilovol wrote: > On Thu, Jun 27, 2013 at 10:24 PM, Michael Trimarchi > <michael@xxxxxxxxxxxxxxxxxxxx> wrote: > > 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 > >> <michael@xxxxxxxxxxxxxxxxxxxx> 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? > > Yes, sorry for confusing :) > Moreover, 2ms is more than enough, errata document says about 1ms delay > (and probably may be decreased up to few useconds) > > > > > 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. > > Do you have locks around this software workaround? > The patch I did against 3.4 linux kernel may be helpful for > you in such case: http://review.omapzoom.org/28515 > Another patch extends this WA for all OMAP4 SoCs: > http://review.omapzoom.org/31108 I'm testing using pm_test and stop to core (5ms and not 5 seconds) (usb suspend cycle are done correctly) so the problem could be: 1) SAR usb context restore. I have applied the SAR workaround but the core doesn't go in full retantion could be it a problem? 2) idle status of ulpis pins? Michael > > Regards > Ruslan > > > > > 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 majordomo@xxxxxxxxxxxxxxx > >> > 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 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
