[PATCH 3/3] i2c: i2c-cdns: Prevent early termination of write

From: Sai Pavan Boddu sai.pavan.boddu@xilinx.com

During sequential loading of data, hold the bus to prevent controller from sending stop signal in case no data is available in fifo.

Signed-off-by: Sai Pavan Boddu sai.pavan.boddu@xilinx.com Reviewed-by: Ashok Reddy Soma ashok.reddy.soma@xilinx.com Signed-off-by: Michal Simek michal.simek@xilinx.com ---

drivers/i2c/i2c-cdns.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/i2c-cdns.c b/drivers/i2c/i2c-cdns.c index 07d53be11f12..0da9f6f35a9f 100644 --- a/drivers/i2c/i2c-cdns.c +++ b/drivers/i2c/i2c-cdns.c @@ -257,16 +257,18 @@ static int cdns_i2c_write_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data, setbits_le32(&regs->control, CDNS_I2C_CONTROL_CLR_FIFO); clrbits_le32(&regs->control, CDNS_I2C_CONTROL_RW);

- /* Check message size against FIFO depth, and set hold bus bit - * if it is greater than FIFO depth + /* + * For sequential data load hold the bus. */ - if (len > CDNS_I2C_FIFO_DEPTH) + if (len > 1) setbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);

/* Clear the interrupts in status register */ writel(CDNS_I2C_INTERRUPTS_MASK, &regs->interrupt_status);

- writel(addr, &regs->address); + /* In case of Probe (i.e no data), start the transfer */ + if (!len) + writel(addr, &regs->address);

while (len-- && !is_arbitration_lost(regs)) { writel(*(cur_data++), &regs->data);