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ohci: rename variable used to preserve the frame interval.

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For code clarity. No functional change.
This commit is contained in:
Martin Whitaker
2022-04-23 08:49:30 +01:00
parent 0939c5e127
commit 0bd19d9d91
1 changed files with 7 additions and 7 deletions
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14
system/ohci.c
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@@ -445,11 +445,11 @@ bool ohci_init(uintptr_t base_addr, usb_hcd_t *hcd)
}
}
// Preserve the FM interval set by the SMM or BIOS.
// Preserve the frame interval set by the SMM or BIOS.
// If not set, use the default value.
uint32_t fm_interval = read32(&op_regs->fm_interval) & 0x3fff;
if (fm_interval == 0) {
fm_interval = 0x2edf;
uint32_t frame_interval = read32(&op_regs->fm_interval) & 0x3fff;
if (frame_interval == 0) {
frame_interval = 0x2edf;
}
// Prepare for host controller setup (see section 5.1.1.3 of the OHCI spec.).
@@ -506,10 +506,10 @@ bool ohci_init(uintptr_t base_addr, usb_hcd_t *hcd)
flush32(&op_regs->interrupt_status, ~0);
// Some controllers ignore writes to these registers when in suspend state, so write them now.
uint32_t max_packet_size = ((fm_interval - 210) * 6) / 7;
uint32_t max_packet_size = ((frame_interval - 210) * 6) / 7;
uint32_t frame_interval_toggle = (read32(&op_regs->fm_interval) & OHCI_FIT) ^ OHCI_FIT;
write32(&op_regs->fm_interval, frame_interval_toggle | max_packet_size << 16 | fm_interval);
write32(&op_regs->periodic_start, (fm_interval * 9) / 10);
write32(&op_regs->fm_interval, frame_interval_toggle | max_packet_size << 16 | frame_interval);
write32(&op_regs->periodic_start, (frame_interval * 9) / 10);
uint32_t rh_descriptor_a = read32(&op_regs->rh_descriptor_a);
uint32_t rh_descriptor_b = read32(&op_regs->rh_descriptor_b);