Searched hist:aef5b738c97995fca9f39855ce0668cc28b71757 (Results 1 – 1 of 1) sorted by relevance
| /rk3399_rockchip-uboot/drivers/reset/ |
| H A D | sti-reset.c | aef5b738c97995fca9f39855ce0668cc28b71757 Thu May 18 07:58:00 UTC 2017 Patrice Chotard <patrice.chotard@st.com> reset: sti: add deassert counter in reset channel descriptor
This deassert counter allow to manage "shared" reset lines
encountered in some specific case. On STiH410 SoC, DWC3,
EHCI and OHCI are all using a respective PHY, but all of
these PHYs shared a "global" reset.
Currently, during command "usb stop", all host controller are
stopped (XHCI, EHCI and OHCI). XHCI is first shutdowned, which
means that PHY global reset is asserted. Then EHCI is shutdowned,
but its PHY reset has already been asserted which make handshake()
call failed in ehci_shutdown().
This counter allows to really assert a reset lines only when the
"last" user is asserting it.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
|