IMX6Q UART5 DMA mode for Bluetooth connection

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IMX6Q UART5 DMA mode for Bluetooth connection

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Contributor II

OS: Android 4.4.2

Kernel Verison: 3.0.35

I'm porting TI wilink 8 wifi+bluetooth module for IMX6Q customer board,

for official BSP source,the bluetooth pin definition as follow using UART5:

MX6Q_PAD_KEY_ROW1__UART5_RXD,
MX6Q_PAD_KEY_COL1__UART5_TXD,
MX6Q_PAD_KEY_COL4__UART5_RTS,
MX6Q_PAD_KEY_ROW4__UART5_CTS,

but in my board, the pin definition as follow:

static iomux_v3_cfg_t mx6q_sabresd_uart5_pads[] = {

    MX6Q_PAD_CSI0_DAT14__UART5_TXD,

    MX6Q_PAD_CSI0_DAT15__UART5_RXD,

    MX6Q_PAD_CSI0_DAT18__UART5_RTS,

    MX6Q_PAD_CSI0_DAT19__UART5_CTS,

    MX6Q_PAD_EIM_A21__GPIO_2_17,    /* BT_EN */

};

but it's not working!! The kernel message as follow:

init: sys_prop: permission denied uid:1003  name:service.bootanim.exit

(hci_tty): inside hci_tty_open (d2b540b0, d19e9840)

(stc): st_register(4)

(stc):  chnl_id list empty :4

(stk) : st_kim_start

plat_kim_chip_enable

(stk) :ldisc_install = 1

(stk) :ldisc installation timeout

(stk) :ldisc_install = 0

(stk) : timed out waiting for ldisc to be un-installed

it look like UART5 not work, I think maybe CSI0_DAT14, CSI0_DAT15, CSI0_DAT18, CSI0_DAT19

not support UART DMA mode, even I survey relate issue from freescale community, a lot of people

(include TI) who worked with the same problem, but they use KEY_ROW1,KEY_COL1, KEY_COL4,

KEY_ROW4.

How could I resolve this issue?

Thanks.

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Senior Contributor III

Your pad settings looks ok.

By default uart5 is disabled in the kernel your need to enabled it. Just verify this.

--- a/arch/arm/mach-mx6/serial.h

+++ b/arch/arm/mach-mx6/serial.h

-#define UART5_UCR4_CTSTL    -1
-#define UART5_DMA_ENABLE   0
+#define UART5_UCR4_CTSTL    16
+#define UART5_DMA_ENABLE   1

Thanks

Saurabh

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