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[0/2] usb: xhci: page size improvements

Message ID 20250108142822.649862-1-niklas.neronin@linux.intel.com
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Series usb: xhci: page size improvements | expand

Message

Niklas Neronin Jan. 8, 2025, 2:28 p.m. UTC 
Correct off-by-one page size debug message.
Set page size to the xHCI-supported size, instead of 4KB.

Clarified the interpretation of the xHCI spec 1.9 regarding page size.
The correct interpretation is that only one bit is set, indicating the
only supported page size. This is supported by the following sources:

Section 6.6.1, PSZ:
  The PSZ calculation uses the page size bit and would not work with
  multiple bits set.

Section 7.7, Implementation Notes:
  "This version of the xHCI spec only allows an implementation to support
   a single page size, as reported by the PAGESIZE register."

Niklas Neronin (2):
  usb: xhci: correct debug message page size calculation
  usb: xhci: set page size to the xHCI-supported size

 drivers/usb/host/xhci-mem.c | 28 ++++++++++++----------------
 drivers/usb/host/xhci.h     |  8 ++++----
 2 files changed, 16 insertions(+), 20 deletions(-)