From 389f61ef44fd032ae5efd3995623842d9281b4c1 Mon Sep 17 00:00:00 2001 From: Max Krummenacher Date: Fri, 8 Feb 2019 18:12:21 +0100 Subject: [PATCH] apalis_imx6: disable ri and dcd irq in uarts If the UART is used in DTE mode the RI and DCD bits in UCR3 become irq enable bits. Both are set to enabled after reset and both likely are pending. Disable the bits also on UARTs not used in the boot loader to prevent an interrupt storm when Linux enables the UART interrupts. Signed-off-by: Max Krummenacher Acked-by: Marcel Ziswiler --- board/toradex/apalis_imx6/apalis_imx6.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/board/toradex/apalis_imx6/apalis_imx6.c b/board/toradex/apalis_imx6/apalis_imx6.c index 407ed1e22e..934ba1fb5b 100644 --- a/board/toradex/apalis_imx6/apalis_imx6.c +++ b/board/toradex/apalis_imx6/apalis_imx6.c @@ -238,8 +238,11 @@ iomux_v3_cfg_t const usb_pads[] = { * UARTs are used in DTE mode, switch the mode on all UARTs before * any pinmuxing connects a (DCE) output to a transceiver output. */ +#define UCR3 0x88 /* FIFO Control Register */ +#define UCR3_RI BIT(8) /* RIDELT DTE mode */ +#define UCR3_DCD BIT(9) /* DCDDELT DTE mode */ #define UFCR 0x90 /* FIFO Control Register */ -#define UFCR_DCEDTE (1<<6) /* DCE=0 */ +#define UFCR_DCEDTE BIT(6) /* DCE=0 */ static void setup_dtemode_uart(void) { @@ -247,6 +250,11 @@ static void setup_dtemode_uart(void) setbits_le32((u32 *)(UART2_BASE + UFCR), UFCR_DCEDTE); setbits_le32((u32 *)(UART4_BASE + UFCR), UFCR_DCEDTE); setbits_le32((u32 *)(UART5_BASE + UFCR), UFCR_DCEDTE); + + clrbits_le32((u32 *)(UART1_BASE + UCR3), UCR3_DCD | UCR3_RI); + clrbits_le32((u32 *)(UART2_BASE + UCR3), UCR3_DCD | UCR3_RI); + clrbits_le32((u32 *)(UART4_BASE + UCR3), UCR3_DCD | UCR3_RI); + clrbits_le32((u32 *)(UART5_BASE + UCR3), UCR3_DCD | UCR3_RI); } static void setup_dcemode_uart(void) { -- 2.25.1