Macpaul Lin eafb27fa52 cdc-acm: fix abnormal DATA RX issue for Mediatek Preloader. ... Mediatek Preloader is a proprietary embedded boot loader for loading Little Kernel and Linux into device DRAM. This boot loader also handle firmware update. Mediatek Preloader will be enumerated as a virtual COM port when the device is connected to Windows or Linux OS via CDC-ACM class driver. When the USB enumeration has been done, Mediatek Preloader will send out handshake command "READY" to PC actively instead of waiting command from the download tool. Since Linux 4.12, the commit "tty: reset termios state on device registration" (93857edd98) causes Mediatek Preloader receiving some abnoraml command like "READYXX" as it sent. This will be recognized as an incorrect response. The behavior change also causes the download handshake fail. This change only affects subsequent connects if the reconnected device happens to get the same minor number. By disabling the ECHO termios flag could avoid this problem. However, it cannot be done by user space configuration when download tool open /dev/ttyACM0. This is because the device running Mediatek Preloader will send handshake command "READY" immediately once the CDC-ACM driver is ready. This patch wants to fix above problem by introducing "DISABLE_ECHO" property in driver_info. When Mediatek Preloader is connected, the CDC-ACM driver could disable ECHO flag in termios to avoid the problem. Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> Cc: stable@vger.kernel.org Reviewed-by: Johan Hovold <johan@kernel.org> Acked-by: Oliver Neukum <oneukum@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-12-20 16:38:52 +01:00
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cdc-acm.c	cdc-acm: fix abnormal DATA RX issue for Mediatek Preloader.	2018-12-20 16:38:52 +01:00
cdc-acm.h	cdc-acm: fix abnormal DATA RX issue for Mediatek Preloader.	2018-12-20 16:38:52 +01:00
cdc-wdm.c	Revert "usb: cdc-wdm: Fix a sleep-in-atomic-context bug in service_outstanding_interrupt()"	2018-09-20 12:47:41 +02:00
Kconfig	usb: fix some references for /proc/bus/usb	2017-04-18 16:54:19 +02:00
Makefile	USB: add SPDX identifiers to all remaining Makefiles	2017-11-07 15:53:48 +01:00
usblp.c	usb: usblp: use irqsave() in USB's complete callback	2018-06-28 19:36:06 +09:00
usbtmc.c	usb: usbtmc: uninitialized symbol 'actual' in usbtmc_ioctl_abort_bulk_in_tag	2018-09-28 15:12:08 +02:00