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usb/ohci: Set pad to 0 after frame update

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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 <wendland@live.com.au>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1048
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-05-23 17:58:40 +02:00
parent b03fcd6818
commit 6301460ce9
1 changed files with 2 additions and 0 deletions
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2
hw/usb/hcd-ohci.c
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@ -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) {