On Tue, 17 Mar 2015, Boris Brezillon wrote: > The EHCI IP only needs the UTMI/UPLL (uclk) and the peripheral (iclk) > clocks to work properly. Remove the useless system clock (fclk). > > Avoid calling set_rate on the fixed rate UTMI/IPLL clock and remove > useless IS_ENABLED(CONFIG_COMMON_CLK) tests (all at91 platforms have been > moved to the CCF). > > This patch also fixes a bug introduced by 3440ef1 (ARM: at91/dt: fix USB > high-speed clock to select UTMI), which was leaving the usb clock > uninitialized and preventing the OHCI driver from setting the usb clock > rate to 48MHz. > This bug was caused by several things: > 1/ usb clock drivers set the CLK_SET_RATE_GATE flag, which means the rate > cannot be changed once the clock is prepared > 2/ The EHCI driver was retrieving and preparing/enabling the uhpck > clock which was in turn preparing its parent clock (the usb clock), > thus preventing any rate change because of 1/ > > Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> -- 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
