Hi Kamil, > Hi Anton, > > > From: Anton Tikhomirov [mailto:av.tikhomirov@xxxxxxxxxxx] > > Sent: Tuesday, December 10, 2013 3:43 AM > > > > Hi Kamil, > > > > Same USB2.0 PHY may be used by several HCDs, for example EHCI and > OHCI. > > Consider the situation, when EHCI stops using the PHY and calls > > power_off, then OHCI becomes non-operational. In other words, PHY > > power_on and power_off calls must be balanced. > > > > Shall we handle it in your driver? (usage count?) > > Please look in the drivers/phy/phy-core.c file. Usage count is handled > there - see phy_power_on and phy_power_off functions. I understand that > after both EHCI and OHCI power on the phy, the usage count is 2. So > powering off one of them (EHCI for instance) the usage count is still > 1, so the OHCI should still work properly. Oops, sorry, missed that. > > [snip] > > Best wishes, > -- > Kamil Debski > Samsung R&D Institute Poland -- 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
