diff options
| author | Dong Aisheng <b29396@freescale.com> | 2013-08-07 20:20:27 +0800 |
|---|---|---|
| committer | Nitin Garg <nitin.garg@freescale.com> | 2014-06-03 23:01:40 -0500 |
| commit | 39e7d8382b1dea26f5111478dc2a26f70b7770c5 (patch) | |
| tree | 0b6b3d6cc76fc30292c79f802564a9bf38d8c02a /arch | |
| parent | f3a8b7f88d1948627c5a315bf1fc255a08c57777 (diff) | |
ENGR00274382 imx6q: fix can transceiver unwork on AI RevE baseboard
The transceiver TJA1041A on sabreauto RevE baseboard will
fail to transit to Normal state if EN/STBY is high by default
after board power up. So we set the EN/STBY initial state to low
first then to high to guarantee the state transition successfully.
Signed-off-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Jason Liu <r64343@freescale.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-mx6/board-mx6q_sabreauto.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/mach-mx6/board-mx6q_sabreauto.c b/arch/arm/mach-mx6/board-mx6q_sabreauto.c index e1df8723146c..7c1fadaf1d47 100644 --- a/arch/arm/mach-mx6/board-mx6q_sabreauto.c +++ b/arch/arm/mach-mx6/board-mx6q_sabreauto.c @@ -1116,6 +1116,15 @@ static int flexcan1_en; static void mx6q_flexcan_switch(void) { if (flexcan0_en || flexcan1_en) { + /* + * The transceiver TJA1041A on sabreauto RevE baseboard will + * fail to transit to Normal state if EN/STBY is high by default + * after board power up. So we set the EN/STBY initial state to low + * first then to high to guarantee the state transition successfully. + */ + gpio_set_value_cansleep(SABREAUTO_CAN_EN, 0); + gpio_set_value_cansleep(SABREAUTO_CAN_STBY, 0); + gpio_set_value_cansleep(SABREAUTO_CAN_EN, 1); gpio_set_value_cansleep(SABREAUTO_CAN_STBY, 1); /* Enable STEER pin if CAN1 interface is required. |