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author | Hans Petter Selasky <hselasky@FreeBSD.org> | 2022-04-21 14:59:09 +0000 |
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committer | Hans Petter Selasky <hselasky@FreeBSD.org> | 2022-04-21 15:01:13 +0000 |
commit | cda31e734925346328fd2369585ab3f6767ec225 (patch) | |
tree | c8fe05f2ff62a9c5754b111d9804f26ed717e9c3 | |
parent | e87ec409fa9b21abf79895837fe375ab3d7e408a (diff) | |
download | src-cda31e734925346328fd2369585ab3f6767ec225.tar.gz src-cda31e734925346328fd2369585ab3f6767ec225.zip |
xhci(4): Ensure the so-called data toggle gets properly reset.
Use the drop and enable endpoint context commands to force a reset of
the data toggle for USB 2.0 and USB 3.0 after:
- clear endpoint halt command (when the driver wishes).
- set config command (when the kernel or user-space wants).
- set alternate setting command (only affected endpoints).
Some XHCI HW implementations may not allow the endpoint reset command when
the endpoint context is not in the halted state.
Reported by: Juniper and Gary Jennejohn
MFC after: 1 week
Sponsored by: NVIDIA Networking
-rw-r--r-- | sys/dev/usb/controller/xhci.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/sys/dev/usb/controller/xhci.c b/sys/dev/usb/controller/xhci.c index f95996b7ab32..72d1ff5e0ae5 100644 --- a/sys/dev/usb/controller/xhci.c +++ b/sys/dev/usb/controller/xhci.c @@ -3772,6 +3772,7 @@ xhci_configure_reset_endpoint(struct usb_xfer *xfer) uint32_t mask; uint8_t index; uint8_t epno; + uint8_t drop; pepext = xhci_get_endpoint_ext(xfer->xroot->udev, xfer->endpoint->edesc); @@ -3813,15 +3814,19 @@ xhci_configure_reset_endpoint(struct usb_xfer *xfer) */ switch (xhci_get_endpoint_state(udev, epno)) { case XHCI_EPCTX_0_EPSTATE_DISABLED: - break; + drop = 0; + break; case XHCI_EPCTX_0_EPSTATE_STOPPED: + drop = 1; break; case XHCI_EPCTX_0_EPSTATE_HALTED: err = xhci_cmd_reset_ep(sc, 0, epno, index); - if (err != 0) + drop = (err != 0); + if (drop) DPRINTF("Could not reset endpoint %u\n", epno); break; default: + drop = 1; err = xhci_cmd_stop_ep(sc, 0, epno, index); if (err != 0) DPRINTF("Could not stop endpoint %u\n", epno); @@ -3842,11 +3847,25 @@ xhci_configure_reset_endpoint(struct usb_xfer *xfer) */ mask = (1U << epno); - xhci_configure_mask(udev, mask | 1U, 0); + + if (epno != 1 && drop != 0) { + /* drop endpoint context to reset data toggle value, if any. */ + xhci_configure_mask(udev, mask, 1); + err = xhci_cmd_configure_ep(sc, buf_inp.physaddr, 0, index); + if (err != 0) { + DPRINTF("Could not drop " + "endpoint %u at slot %u.\n", epno, index); + } else { + sc->sc_hw.devs[index].ep_configured &= ~mask; + } + } + + xhci_configure_mask(udev, mask, 0); if (!(sc->sc_hw.devs[index].ep_configured & mask)) { - sc->sc_hw.devs[index].ep_configured |= mask; err = xhci_cmd_configure_ep(sc, buf_inp.physaddr, 0, index); + if (err == 0) + sc->sc_hw.devs[index].ep_configured |= mask; } else { err = xhci_cmd_evaluate_ctx(sc, buf_inp.physaddr, index); } |