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xhci: dbc: add helper to set and clear DbC DCE enable bit

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Add xhci_dbc_enable_dce() helper to enable or disable DbC by manipulating
DCE bit correctly. It will be used for stuck DbC recovery attempts in
addition to normal DbC enable and disable functionality

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://patch.msgid.link/20260603091132.1110849-10-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2026-06-03 12:11:26 +03:00 committed by Greg Kroah-Hartman
parent 520058b73b
commit de58a7d374
1 changed files with 18 additions and 11 deletions
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29
drivers/usb/host/xhci-dbgcap.c
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@ -628,18 +628,30 @@ static void xhci_dbc_mem_cleanup(struct xhci_dbc *dbc)
dbc->ring_evt = NULL;
}
static int xhci_dbc_enable_dce(struct xhci_dbc *dbc, bool enable)
{
u32 done_state = 0;
u32 ctrl = 0;
if (enable) {
ctrl = readl(&dbc->regs->control);
ctrl |= DBC_CTRL_DBC_ENABLE | DBC_CTRL_PORT_ENABLE;
done_state = DBC_CTRL_DBC_ENABLE;
}
writel(ctrl, &dbc->regs->control);
return xhci_handshake(&dbc->regs->control, DBC_CTRL_DBC_ENABLE,
done_state, 1000);
}
static int xhci_do_dbc_start(struct xhci_dbc *dbc)
{
int ret;
u32 ctrl;
if (dbc->state != DS_DISABLED)
return -EINVAL;
writel(0, &dbc->regs->control);
ret = xhci_handshake(&dbc->regs->control,
DBC_CTRL_DBC_ENABLE,
0, 1000);
ret = xhci_dbc_enable_dce(dbc, false);
if (ret)
return ret;
@ -647,12 +659,7 @@ static int xhci_do_dbc_start(struct xhci_dbc *dbc)
if (ret)
return ret;
ctrl = readl(&dbc->regs->control);
writel(ctrl | DBC_CTRL_DBC_ENABLE | DBC_CTRL_PORT_ENABLE,
&dbc->regs->control);
ret = xhci_handshake(&dbc->regs->control,
DBC_CTRL_DBC_ENABLE,
DBC_CTRL_DBC_ENABLE, 1000);
ret = xhci_dbc_enable_dce(dbc, true);
if (ret)
return ret;