[Deepin-Kernel-SIG] [linux 6.6.y] [Upstream] r8152: fix incorrect register write to USB_UPHY_XTAL

[Avenger-285714]

[Upstream commit 48afd5124fd6129c46fd12cb06155384b1c4a0c4]

The old code used ocp_write_byte() to clear the OOBS_POLLING bit (BIT(8)) in the USB_UPHY_XTAL register, but this doesn't correctly clear a bit in the upper byte of the 16-bit register.

Fix this by using ocp_write_word() instead.

Fixes: 195aae3 ("r8152: support new chips")

Reviewed-by: Hayes Wang hayeswang@realtek.com
Link: https://patch.msgid.link/20260326073925.32976-454-nic_swsd@realtek.com

Summary by Sourcery

Bug Fixes:

• Correct USB_UPHY_XTAL OOBS_POLLING bit clearing by writing the full 16-bit word instead of a single byte.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the r8152 USB network driver to correctly clear a 16-bit register bit by switching from a byte write helper to a word write helper when modifying USB_UPHY_XTAL for certain chip revisions.

Sequence diagram for updated r8156_ups_en register write

sequenceDiagram
    participant Driver as r8156_ups_en
    participant USBMCU as MCU_TYPE_USB

    Driver->>USBMCU: ocp_read_word(USB_UPHY_XTAL)
    USBMCU-->>Driver: ocp_data
    Driver->>Driver: ocp_data &= ~OOBS_POLLING
    Driver->>USBMCU: ocp_write_word(USB_UPHY_XTAL, ocp_data)

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File-Level Changes

Change	Details	Files
Use a 16-bit register write helper when clearing the OOBS_POLLING bit in USB_UPHY_XTAL for RTL_VER_15 in r8156_ups_en().	Read USB_UPHY_XTAL with ocp_read_word and mask out OOBS_POLLING as before Replace ocp_write_byte with ocp_write_word to write back the full 16-bit value, ensuring the upper byte bit is cleared correctly	drivers/net/usb/r8152.c

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Pull request overview

Fixes a Realtek r8152/r8156 USB OCP register programming bug where clearing OOBS_POLLING (BIT(8)) in the 16-bit USB_UPHY_XTAL register incorrectly used an 8-bit write, preventing the upper-byte bit from being cleared.

Changes:

• Replace ocp_write_byte() with ocp_write_word() when updating USB_UPHY_XTAL in r8156_ups_en().
• Ensure the OOBS_POLLING bit (BIT(8)) is actually cleared in the 16-bit register value read via ocp_read_word().

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