Am Mittwoch, 21. Dezember 2016, 18:41:05 CET schrieb Xing Zheng: > From: William wu <wulf@xxxxxxxxxxxxxx> > > We found that the suspend process was blocked when it run into > ehci/ohci module due to clk-480m of usb2-phy was disabled. > > The root cause is that usb2-phy suspended earlier than ehci/ohci > (usb2-phy will be auto suspended if no devices plug-in). and the > clk-480m provided by it was disabled if no module used. However, > some suspend process related ehci/ohci are base on this clock, > so we should refer it into ehci/ohci driver to prevent this case. > > The u2phy clock flow like this: > === > u2phy ________________ > > | | |-----> UTMI_CLK ---------> | EHCI | > > OSC_24M ---|---> PHY_PLL----|----| > > |________^_______| |-----> 480M_CLK ---|G|---> | > |USBPHY_480M_SRC| ----> USBPHY_480M for SoC > GRF > === > > Signed-off-by: William wu <wulf@xxxxxxxxxxxxxx> > Signed-off-by: Xing Zheng <zhengxing@xxxxxxxxxxxxxx> applied for 4.11 with Doug's Review-tag Thanks Heiko -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
