From: Paolo Bonzini Date: Tue, 23 May 2023 15:58:40 +0000 (+0200) Subject: usb/ohci: Set pad to 0 after frame update X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=6301460ce9f59885e8feb65185bcfb6b128c8eff;p=qmiga%2Fqemu.git usb/ohci: Set pad to 0 after frame update When the OHCI controller's framenumber is incremented, HccaPad1 register should be set to zero (Ref OHCI Spec 4.4) ReactOS uses hccaPad1 to determine if the OHCI hardware is running, consequently it fails this check in current qemu master. Signed-off-by: Ryan Wendland Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1048 Signed-off-by: Paolo Bonzini --- diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c index 88d2b4b13c..cc5cde6983 100644 --- a/hw/usb/hcd-ohci.c +++ b/hw/usb/hcd-ohci.c @@ -1239,6 +1239,8 @@ static void ohci_frame_boundary(void *opaque) /* Increment frame number and take care of endianness. */ ohci->frame_number = (ohci->frame_number + 1) & 0xffff; hcca.frame = cpu_to_le16(ohci->frame_number); + /* When the HC updates frame number, set pad to 0. Ref OHCI Spec 4.4.1*/ + hcca.pad = 0; if (ohci->done_count == 0 && !(ohci->intr_status & OHCI_INTR_WD)) { if (!ohci->done) {