From d5383a63cd1286392a9792f3bd9e9b0d87e02171 Mon Sep 17 00:00:00 2001 From: Troy Kisky Date: Thu, 19 Jul 2012 08:18:15 +0000 Subject: [PATCH] mxc_i2c: check for arbitration lost No need to continue waiting if arbitration lost. Signed-off-by: Troy Kisky Acked-by: Marek Vasut --- drivers/i2c/mxc_i2c.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index ba2aad3d0d..093a73f1c5 100644 --- a/drivers/i2c/mxc_i2c.c +++ b/drivers/i2c/mxc_i2c.c @@ -55,6 +55,7 @@ struct mxc_i2c_regs { #define I2SR_ICF (1 << 7) #define I2SR_IBB (1 << 5) +#define I2SR_IAL (1 << 4) #define I2SR_IIF (1 << 1) #define I2SR_RX_NO_AK (1 << 0) @@ -165,6 +166,12 @@ static int wait_for_sr_state(struct mxc_i2c_regs *i2c_regs, unsigned state) ulong start_time = get_timer(0); for (;;) { sr = readb(&i2c_regs->i2sr); + if (sr & I2SR_IAL) { + writeb(sr & ~I2SR_IAL, &i2c_regs->i2sr); + printf("%s: Arbitration lost sr=%x cr=%x state=%x\n", + __func__, sr, readb(&i2c_regs->i2cr), state); + return -ERESTART; + } if ((sr & (state >> 8)) == (unsigned char)state) return sr; WATCHDOG_RESET(); -- 2.39.5