[PATCH 2/7] serial: 8250_fintek: Set IRQ Mode when port probed

[Ji-Ze Hong (Peter Hong)]

Set IRQ Mode when port probed in find_base_port()

It should hold the IO port premission via fintek_8250_enter_key() and
release via fintek_8250_exit_key() when we configure the SuperIO.

This patch will move all SuperIO configure operations to find_base_port()
to reduce fintek_8250_enter_key()/fintek_8250_exit_key() usage.

Suggested-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_ker...@gmail.com>
---
 drivers/tty/serial/8250/8250_fintek.c | 36 ++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_fintek.c 
b/drivers/tty/serial/8250/8250_fintek.c
index 2ae846e..cd8903f 100644
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -49,6 +49,9 @@ struct fintek_8250 {
        u8 key;
 };
 
+static void fintek_8250_set_irq_mode(struct fintek_8250 *pdata,
+                                    bool level_mode);
+
 static u8 sio_read_reg(struct fintek_8250 *pdata, u8 reg)
 {
        outb(reg, pdata->base_port + ADDR_PORT);
@@ -154,10 +157,13 @@ static int fintek_8250_rs485_config(struct uart_port 
*port,
        return 0;
 }
 
-static int find_base_port(struct fintek_8250 *pdata, u16 io_address)
+static int find_base_port(struct fintek_8250 *pdata, u16 io_address,
+                         unsigned int irq)
 {
        static const u16 addr[] = {0x4e, 0x2e};
        static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67};
+       struct irq_data *irq_data;
+       bool level_mode = false;
        int i, j, k;
 
        for (i = 0; i < ARRAY_SIZE(addr); i++) {
@@ -181,9 +187,16 @@ static int find_base_port(struct fintek_8250 *pdata, u16 
io_address)
                                if (aux != io_address)
                                        continue;
 
-                               fintek_8250_exit_key(addr[i]);
                                pdata->index = k;
 
+                               irq_data = irq_get_irq_data(irq);
+                               if (irq_data)
+                                       level_mode =
+                                               irqd_is_level_type(irq_data);
+
+                               fintek_8250_set_irq_mode(pdata, level_mode);
+                               fintek_8250_exit_key(addr[i]);
+
                                return 0;
                        }
 
@@ -194,31 +207,20 @@ static int find_base_port(struct fintek_8250 *pdata, u16 
io_address)
        return -ENODEV;
 }
 
-static int fintek_8250_set_irq_mode(struct fintek_8250 *pdata, bool level_mode)
+static void fintek_8250_set_irq_mode(struct fintek_8250 *pdata, bool is_level)
 {
-       int status;
-
-       status = fintek_8250_enter_key(pdata->base_port, pdata->key);
-       if (status)
-               return status;
-
        sio_write_reg(pdata, LDN, pdata->index);
        sio_write_mask_reg(pdata, FINTEK_IRQ_MODE, IRQ_SHARE, IRQ_SHARE);
        sio_write_mask_reg(pdata, FINTEK_IRQ_MODE, IRQ_MODE_MASK,
-                          level_mode ? IRQ_LEVEL_LOW : IRQ_EDGE_HIGH);
-
-       fintek_8250_exit_key(pdata->base_port);
-       return 0;
+                          is_level ? IRQ_LEVEL_LOW : IRQ_EDGE_HIGH);
 }
 
 int fintek_8250_probe(struct uart_8250_port *uart)
 {
        struct fintek_8250 *pdata;
        struct fintek_8250 probe_data;
-       struct irq_data *irq_data = irq_get_irq_data(uart->port.irq);
-       bool level_mode = irqd_is_level_type(irq_data);
 
-       if (find_base_port(&probe_data, uart->port.iobase))
+       if (find_base_port(&probe_data, uart->port.iobase, uart->port.irq))
                return -ENODEV;
 
        pdata = devm_kzalloc(uart->port.dev, sizeof(*pdata), GFP_KERNEL);
@@ -229,5 +231,5 @@ int fintek_8250_probe(struct uart_8250_port *uart)
        uart->port.rs485_config = fintek_8250_rs485_config;
        uart->port.private_data = pdata;
 
-       return fintek_8250_set_irq_mode(pdata, level_mode);
+       return 0;
 }
-- 
1.9.1