diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2026-06-03 12:11:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-06-03 20:23:29 +0300 |
| commit | de58a7d374eb0caae801704c3e47400b41a53acf (patch) | |
| tree | a803fa6f20b208399e52ec92fd503fa773a1392d | |
| parent | 520058b73ba336380ecf7ea412263de9a7573df8 (diff) | |
| download | linux-de58a7d374eb0caae801704c3e47400b41a53acf.tar.xz | |
xhci: dbc: add helper to set and clear DbC DCE enable bit
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>
| -rw-r--r-- | drivers/usb/host/xhci-dbgcap.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c index 49ae546c4103..8cf0f0356bf1 100644 --- a/drivers/usb/host/xhci-dbgcap.c +++ b/drivers/usb/host/xhci-dbgcap.c @@ -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; |