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Subject[PATCH v3 2/2] USB: storage: ums-realtek: Whitelist auto-delink support
Date
Auto-delink requires writing special registers to ums-realtek devices.
Unconditionally enable auto-delink may break newer devices.

So only enable auto-delink by default for the original three IDs,
0x0138, 0x0158 and 0x0159.

Realtek is working on a patch to properly support auto-delink for other
IDs.

BugLink: https://bugs.launchpad.net/bugs/1838886
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v3:
- Whitelisting instead of adding new module parameter.
v2:
- Use auto_delink_support instead of auto_delink_enable.

drivers/usb/storage/realtek_cr.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c
index beaffac805af..1d9ce9cbc831 100644
--- a/drivers/usb/storage/realtek_cr.c
+++ b/drivers/usb/storage/realtek_cr.c
@@ -996,12 +996,15 @@ static int init_realtek_cr(struct us_data *us)
goto INIT_FAIL;
}

- if (CHECK_FW_VER(chip, 0x5888) || CHECK_FW_VER(chip, 0x5889) ||
- CHECK_FW_VER(chip, 0x5901))
- SET_AUTO_DELINK(chip);
- if (STATUS_LEN(chip) == 16) {
- if (SUPPORT_AUTO_DELINK(chip))
+ if (CHECK_PID(chip, 0x0138) || CHECK_PID(chip, 0x0158) ||
+ CHECK_PID(chip, 0x0159)) {
+ if (CHECK_FW_VER(chip, 0x5888) || CHECK_FW_VER(chip, 0x5889) ||
+ CHECK_FW_VER(chip, 0x5901))
SET_AUTO_DELINK(chip);
+ if (STATUS_LEN(chip) == 16) {
+ if (SUPPORT_AUTO_DELINK(chip))
+ SET_AUTO_DELINK(chip);
+ }
}
#ifdef CONFIG_REALTEK_AUTOPM
if (ss_en)
--
2.17.1
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