omap24xx_i2c: Handle wait_for_bb error

We add a return code to wait_for_bb() to be able to report errors to the
callers properly. We in turn handle this new error code in i2c_read, i2c_write
and i2c_probe.

Signed-off-by: Vincent Stehlé <v-stehle@ti.com>

diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index 094305fdf932111b406a5546f707c5d28e4e89aa..1bbb2ca54c1f7a0606567f94f01c25e64065a8b6 100644 (file)
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -31,7 +31,7 @@ DECLARE_GLOBAL_DATA_PTR;
 
 #define I2C_TIMEOUT    1000
 
-static void wait_for_bb(void);
+static int wait_for_bb(void);
 static u16 wait_for_pin(void);
 static void flush_fifo(void);
 
@@ -159,7 +159,8 @@ static int i2c_read_byte(u8 devaddr, u16 regoffset, u8 alen, u8 *value)
        u16 w;
 
        /* wait until bus not busy */
-       wait_for_bb();
+       if (wait_for_bb())
+               return 1;
 
        /* one byte only */
        writew(alen, &i2c_base->cnt);
@@ -260,7 +261,8 @@ int i2c_probe(uchar chip)
                return res;
 
        /* wait until bus not busy */
-       wait_for_bb();
+       if (wait_for_bb())
+               return res;
 
        /* try to read one byte */
        writew(1, &i2c_base->cnt);
@@ -279,7 +281,10 @@ int i2c_probe(uchar chip)
                        res = 1;
                        writew(0xff, &i2c_base->stat);
                        writew (readw (&i2c_base->con) | I2C_CON_STP, &i2c_base->con);
-                       wait_for_bb ();
+
+                       if (wait_for_bb())
+                               res = 1;
+
                        break;
                }
                if (status & I2C_STAT_ARDY) {
@@ -351,7 +356,8 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
        }
 
        /* wait until bus not busy */
-       wait_for_bb();
+       if (wait_for_bb())
+               return 1;
 
        /* start address phase - will write regoffset + len bytes data */
        /* TODO consider case when !CONFIG_OMAP243X/34XX/44XX */
@@ -394,7 +400,7 @@ write_exit:
        return i2c_error;
 }
 
-static void wait_for_bb(void)
+static int wait_for_bb(void)
 {
        int timeout = I2C_TIMEOUT;
        u16 stat;
@@ -408,8 +414,10 @@ static void wait_for_bb(void)
        if (timeout <= 0) {
                printf("timed out in wait_for_bb: I2C_STAT=%x\n",
                        readw(&i2c_base->stat));
+               return 1;
        }
        writew(0xFFFF, &i2c_base->stat);         /* clear delayed stuff*/
+       return 0;
 }
 
 static u16 wait_for_pin(void)