On 4.2.2025 14.41, Niklas Neronin wrote:
The current xHCI driver does not validate whether a page size of 4096
bytes is supported. Address the issue by setting the page size to the
value supported by the xHCI controller, as read from the Page Size
register. In the event of an unexpected value; default to a 4K page size.
Additionally, this commit removes unnecessary debug messages and instead
prints the supported and used page size once.
The xHCI controller supports page sizes of (2^{(n+12)}) bytes, where 'n'
is the Page Size Bit. Only one page size is supported, with a maximum
page size of 128 KB.
Signed-off-by: Niklas Neronin <niklas.neronin@xxxxxxxxxxxxxxx>
---
V3:
* Rename local variable 'page_shift' to 'page_size'.
drivers/usb/host/xhci-mem.c | 34 ++++++++++++++++++----------------
drivers/usb/host/xhci.h | 8 ++++----
2 files changed, 22 insertions(+), 20 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index dc5bcd8db4c0..c2ee0d32f5cd 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1953,7 +1953,6 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
xhci->interrupters = NULL;
xhci->page_size = 0;
- xhci->page_shift = 0;
xhci->usb2_rhub.bus_state.bus_suspended = 0;
xhci->usb3_rhub.bus_state.bus_suspended = 0;
}
@@ -2372,6 +2371,22 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
}
EXPORT_SYMBOL_GPL(xhci_create_secondary_interrupter);
+static void xhci_hcd_page_size(struct xhci_hcd *xhci)
+{
+ u32 page_size;
+
+ page_size = readl(&xhci->op_regs->page_size) & XHCI_PAGE_SIZE_MASK;
+ if (!page_size || page_size & (page_size - 1)) {
is_power_of_2(page_size) does the same, and is easier to understand
-Mathias
