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Subject[PATCH V3 1/3] tty: serial: fsl_lpuart: only enable Idle Line Interrupt for non-dma case
Date
For the lpuart driver, the Idle Line Interrupt Enable now is only needed
for the CPU mode, so enable the UARTCTRL_ILIE at the correct place, and
clear it when shutdown.

Also need to configure the suitable UARTCTRL_IDLECFG, now the value is
0x7, represent 128 idle characters will trigger the Idle Line Interrupt.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
---
drivers/tty/serial/fsl_lpuart.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 5e69fb73f570..9b8d32262f1e 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -5,6 +5,8 @@
* Copyright 2012-2014 Freescale Semiconductor, Inc.
*/

+#include <linux/bitfield.h>
+#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/console.h>
#include <linux/delay.h>
@@ -181,7 +183,7 @@
#define UARTCTRL_SBK 0x00010000
#define UARTCTRL_MA1IE 0x00008000
#define UARTCTRL_MA2IE 0x00004000
-#define UARTCTRL_IDLECFG 0x00000100
+#define UARTCTRL_IDLECFG GENMASK(10, 8)
#define UARTCTRL_LOOPS 0x00000080
#define UARTCTRL_DOZEEN 0x00000040
#define UARTCTRL_RSRC 0x00000020
@@ -1523,7 +1525,7 @@ static void lpuart32_setup_watermark(struct lpuart_port *sport)
ctrl = lpuart32_read(&sport->port, UARTCTRL);
ctrl_saved = ctrl;
ctrl &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_TE |
- UARTCTRL_RIE | UARTCTRL_RE);
+ UARTCTRL_RIE | UARTCTRL_RE | UARTCTRL_ILIE);
lpuart32_write(&sport->port, ctrl, UARTCTRL);

/* enable FIFO mode */
@@ -1547,7 +1549,8 @@ static void lpuart32_setup_watermark_enable(struct lpuart_port *sport)
lpuart32_setup_watermark(sport);

temp = lpuart32_read(&sport->port, UARTCTRL);
- temp |= UARTCTRL_RE | UARTCTRL_TE | UARTCTRL_ILIE;
+ temp |= UARTCTRL_RE | UARTCTRL_TE;
+ temp |= FIELD_PREP(UARTCTRL_IDLECFG, 0x7);
lpuart32_write(&sport->port, temp, UARTCTRL);
}

@@ -1691,7 +1694,7 @@ static void lpuart32_configure(struct lpuart_port *sport)
}
temp = lpuart32_read(&sport->port, UARTCTRL);
if (!sport->lpuart_dma_rx_use)
- temp |= UARTCTRL_RIE;
+ temp |= UARTCTRL_RIE | UARTCTRL_ILIE;
if (!sport->lpuart_dma_tx_use)
temp |= UARTCTRL_TIE;
lpuart32_write(&sport->port, temp, UARTCTRL);
@@ -1798,7 +1801,7 @@ static void lpuart32_shutdown(struct uart_port *port)

/* disable Rx/Tx and interrupts */
temp = lpuart32_read(port, UARTCTRL);
- temp &= ~(UARTCTRL_TE | UARTCTRL_RE |
+ temp &= ~(UARTCTRL_TE | UARTCTRL_RE | UARTCTRL_ILIE |
UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
lpuart32_write(port, temp, UARTCTRL);

--
2.17.1
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