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DM USB: xHCI: workaround for Stop Endpoint Command handling

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This patch is one workaround to resolve a crash issue for certain brand
touch screen (eGalaxTouch EXC7200-7368v1.01). The formal fix should
follow the xHCI spec to stop xfer and generate transfer completed event
trb prior to Stop Endpoint Command complete event trb. It should be a
big change and for short term, do nothing for the stop endpoint command
which is no other side effect be observed so far.

Tracked-On: #1413
Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com>
Reviewed-by: Liang Yang <liang3.yang@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Xiaoguang Wu
2018-10-18 23:09:50 +08:00
committed by Xie, Nanlin
parent ecf0585bf2
commit 6a9a46ac47
3 changed files with 8 additions and 20 deletions
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17
devicemodel/hw/platform/usb_pmapper.c
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@@ -244,22 +244,6 @@ usb_dev_comp_req(struct libusb_transfer *libusb_xfer)
}
}
/* in case the xfer is reset by the USB_DATA_XFER_RESET */
if (xfer->reset == 1) {
UPRINTF(LDBG, "ep%d reset detected\r\n", xfer->epid);
xfer->reset = 0;
/* ONLY interrupt transfer needs this.
* The transfer here is an old one before endpoint reset, so it
* should be discarded. But for bulk transfer, the transfer here
* is a new one after reset, so it should be kept.
*/
if (usb_dev_get_ep_type(req->udev, xfer->pid & 1,
xfer->epid / 2) == USB_ENDPOINT_INT) {
UPRINTF(LDBG, "goto reset out\r\n");
goto reset_out;
}
}
/* handle the blocks belong to this request */
buf_idx = 0;
idx = req->blk_start;
@@ -323,7 +307,6 @@ out:
if (do_intr && g_ctx.intr_cb)
g_ctx.intr_cb(xfer->dev, NULL);
reset_out:
/* unlock and release memory */
USB_DATA_XFER_UNLOCK(xfer);
libusb_free_transfer(libusb_xfer);