[PATCH 2/2] i2c: sprd: Fix the i2c count issue

[Baolin Wang]

We found the I2C controller count register is unreliable sometimes,
that will cause I2C to lose data. Thus we can read the data count
from 'i2c_dev->count' instead of the I2C controller count register.

Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
 drivers/i2c/busses/i2c-sprd.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
index 2fdad63..4053259 100644
--- a/drivers/i2c/busses/i2c-sprd.c
+++ b/drivers/i2c/busses/i2c-sprd.c
@@ -368,13 +368,12 @@ static irqreturn_t sprd_i2c_isr_thread(int irq, void 
*dev_id)
        struct sprd_i2c *i2c_dev = dev_id;
        struct i2c_msg *msg = i2c_dev->msg;
        bool ack = !(readl(i2c_dev->base + I2C_STATUS) & I2C_RX_ACK);
-       u32 i2c_count = readl(i2c_dev->base + I2C_COUNT);
        u32 i2c_tran;
 
        if (msg->flags & I2C_M_RD)
                i2c_tran = i2c_dev->count >= I2C_FIFO_FULL_THLD;
        else
-               i2c_tran = i2c_count;
+               i2c_tran = i2c_dev->count;
 
        /*
         * If we got one ACK from slave when writing data, and we did not
@@ -412,14 +411,13 @@ static irqreturn_t sprd_i2c_isr(int irq, void *dev_id)
 {
        struct sprd_i2c *i2c_dev = dev_id;
        struct i2c_msg *msg = i2c_dev->msg;
-       u32 i2c_count = readl(i2c_dev->base + I2C_COUNT);
        bool ack = !(readl(i2c_dev->base + I2C_STATUS) & I2C_RX_ACK);
        u32 i2c_tran;
 
        if (msg->flags & I2C_M_RD)
                i2c_tran = i2c_dev->count >= I2C_FIFO_FULL_THLD;
        else
-               i2c_tran = i2c_count;
+               i2c_tran = i2c_dev->count;
 
        /*
         * If we did not get one ACK from slave when writing data, then we
-- 
1.7.9.5