HI,
On Fri, Jun 07, 2013 at 03:36:38PM +0300, Grygorii Strashko wrote:
> hi Tomi,
> On 06/07/2013 02:53 PM, Tomi Valkeinen wrote:
> >Hi,
> >
> >I was testing DT boot with 3.10-rc1 and Pandaboard, and couldn't get the
> >DVI output's EDID reading to work. Testing with i2cget and i2cdump, I
> >see that I can read individual bytes with i2cget, but using i2cdump
> >doesn't work, it just shows 'XX'es.
> >
> >The same issue is there with 3.10-rc4, although with that one I get
> >timeouts with i2cdump, whereas there were no timeouts with -rc1.
> >
> ># i2cget -y 2 0x50 0x10
> >0x0a
> ># i2cget -y 2 0x50 0x20
> >0x0f
> ># i2cget -y 2 0x50 0x30
> >0x01
> ># i2cget -y 2 0x50 0x40
> >0x36
> ># i2cget -y 2 0x50 0x50
> >0x4c
> ># i2cdump -y 2 0x50
> >No size specified (using byte-data access)
> > 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
> >00: 00 [ 72.814086] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >XX [ 73.825134] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >XX [ 74.835327] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >XX [ 76.097167] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >XX [ 77.160736] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >XX [ 78.174682] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >XX [ 79.194824] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >XX [ 80.242980] omap_i2c 48060000.i2c: timeout waiting for bus ready
> >
> >i2cdump works fine with non-DT boot (but the i2c bus number is 3).
> >
> >Any ideas?
> >
> > Tomi
> >
> Could you check if below change will help you, pls?
> iff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index 13d1eca..66a62e7 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -615,11 +615,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> if (dev->cmd_err & OMAP_I2C_STAT_NACK) {
> if (msg->flags & I2C_M_IGNORE_NAK)
> return 0;
> - if (stop) {
> - w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
> - w |= OMAP_I2C_CON_STP;
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
> - }
> +
> + w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
> + w |= OMAP_I2C_CON_STP;
> + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
> +don't do this, it will break repeated start. -- balbi
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