From: Kevin Wells Date: Tue, 16 Mar 2010 22:55:37 +0000 (-0700) Subject: i2c-pnx: Add stop conditions for end of transfer X-Git-Tag: v2.6.34-rc6~71^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=28ad3321a1ac732c7fe37d5be85f67fe40ef18a9;p=profile%2Fivi%2Fkernel-x86-ivi.git i2c-pnx: Add stop conditions for end of transfer Add a stop condition bit flag to the last byte in the transfer. This will generate an extra clock to handle the stop condition and prevent devices from staying in an ACK'd state. Signed-off-by: Kevin Wells Signed-off-by: Ben Dooks --- diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c index 68fa415..a97e3fe 100644 --- a/drivers/i2c/busses/i2c-pnx.c +++ b/drivers/i2c/busses/i2c-pnx.c @@ -173,6 +173,9 @@ static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data) /* We still have something to talk about... */ val = *alg_data->mif.buf++; + if (alg_data->mif.len == 1) + val |= stop_bit; + alg_data->mif.len--; iowrite32(val, I2C_REG_TX(alg_data)); @@ -246,6 +249,9 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data) __func__); if (alg_data->mif.len == 1) { + /* Last byte, do not acknowledge next rcv. */ + val |= stop_bit; + /* * Enable interrupt RFDAIE (data in Rx fifo), * and disable DRMIE (need data for Tx)