linux-kernel - [PATCH 2/2] usb: core: Add USB_QUIRK_DELAY_CTRL

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Date:   Sat, 24 Mar 2018 03:26:36 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: [PATCH 2/2] usb: core: Add USB_QUIRK_DELAY_CTRL_MSG to usbcore quirks

There's a new quirk, USB_QUIRK_DELAY_CTRL_MSG. Add it to usbcore quirks
for completeness.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 4 +++-
 drivers/usb/core/quirks.c                       | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 61ab660f7fdc..a0b4377cb8da 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4454,7 +4454,9 @@
 					calculation);
 				m = USB_QUIRK_DISCONNECT_SUSPEND (Device needs
 					to be disconnected before suspend to
-					prevent spurious wakeup)
+					prevent spurious wakeup);
+				n = USB_QUIRK_DELAY_CTRL_MSG (Device needs a
+					pause after every control message);
 			Example: quirks=0781:5580:bk,0a5c:5834:gij
 
 	usbhid.mousepoll=
diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 29e5f32b38df..920f48a49a87 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -124,6 +124,9 @@ static int quirks_param_set(const char *val, const struct kernel_param *kp)
 			case 'm':
 				flags |= USB_QUIRK_DISCONNECT_SUSPEND;
 				break;
+			case 'n':
+				flags |= USB_QUIRK_DELAY_CTRL_MSG;
+				break;
 			/* Ignore unrecognized flag characters */
 			}
 		}
-- 
2.15.1