Hi All Most MAX* MUIC drivers unconditionally force UART path during probe. This approach causes some issues, especially when board is booted with non-UART cable connected to micro-USB port. For example, when USB cable is connected, UART TX/RX lines are unconditionally short-circuited to USB D+/D- lines. This is in turn recognized by a series of serial BREAK signals and some random characters when USB host tries to perform enumeration procedure. To solve the above issue and keep UART console operational as early as possible, set UART path only when USB ID reports UART capable cable. This patchset fixes following MAX* extcon drivers: 8997, 14577, 77693 and 77843. Tested on following Samsung boards: Trats (8997), Rinato (14577), Trats2 (77693) and TM2/TM2e (77843). Best regards Marek Szyprowski Samsung R&D Institute Poland Patch summary: Marek Szyprowski (4): extcon: max77843: Avoid forcing UART path on drive probe extcon: max77693: Avoid forcing UART path on drive probe extcon: max14577: Avoid forcing UART path on drive probe extcon: max8997: Avoid forcing UART path on drive probe drivers/extcon/extcon-max14577.c | 15 +++++++++++++-- drivers/extcon/extcon-max77693.c | 16 ++++++++++++++-- drivers/extcon/extcon-max77843.c | 18 +++++++++++++++--- drivers/extcon/extcon-max8997.c | 15 +++++++++++++-- 4 files changed, 55 insertions(+), 9 deletions(-) -- 2.17.1
