linux-kernel - [PATCH v3 2/2] USB: storage: ums-realtek: Whitelist auto-delink support

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Date:   Wed, 28 Aug 2019 01:34:50 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     stern@...land.harvard.edu
Cc:     gregkh@...uxfoundation.org, bauer.chen@...ltek.com,
        ricky_wu@...ltek.com, linux-usb@...r.kernel.org,
        usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: [PATCH v3 2/2] USB: storage: ums-realtek: Whitelist auto-delink support

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@...onical.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