diff options
| author | Niklas Neronin <niklas.neronin@linux.intel.com> | 2025-05-15 16:56:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-21 12:35:31 +0200 |
| commit | 84f007707f21f46323ca310da0e4639d73c22b72 (patch) | |
| tree | 340e5a6f417c40378879a62b44ad97379d415816 /drivers/usb/host/xhci.c | |
| parent | 22f9b3c2f33d1dd8bf32f7c20f4eb16489259013 (diff) | |
usb: xhci: move device slot enabling register write
Refactor the setting of the Number of Device Slots Enabled field into a
separate function, relocating it to xhci_init().
The xHCI driver consistently sets the number of enabled device slots to the
maximum value. The new function is named to reflect this behavior.
Remove the "// " prefix from trace messages, as it is unnecessary and
distracting.
Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20250515135621.335595-5-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index b073e9d91665..ec0a2fa7d003 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -477,6 +477,24 @@ static void xhci_hcd_page_size(struct xhci_hcd *xhci) xhci->page_size >> 10); } +static void xhci_enable_max_dev_slots(struct xhci_hcd *xhci) +{ + u32 config_reg; + u32 max_slots; + + max_slots = HCS_MAX_SLOTS(xhci->hcs_params1); + xhci_dbg_trace(xhci, trace_xhci_dbg_init, "xHC can handle at most %d device slots", + max_slots); + + config_reg = readl(&xhci->op_regs->config_reg); + config_reg &= ~HCS_SLOTS_MASK; + config_reg |= max_slots; + + xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Setting Max device slots reg = 0x%x", + config_reg); + writel(config_reg, &xhci->op_regs->config_reg); +} + /* * Initialize memory for HCD and xHC (one-time init). * @@ -502,6 +520,9 @@ static int xhci_init(struct usb_hcd *hcd) if (retval) return retval; + /* Set the Number of Device Slots Enabled to the maximum supported value */ + xhci_enable_max_dev_slots(xhci); + /* Initializing Compliance Mode Recovery Data If Needed */ if (xhci_compliance_mode_recovery_timer_quirk_check()) { xhci->quirks |= XHCI_COMP_MODE_QUIRK; |