> Hi Eric,
>
> yes, arbitration lost on i2c is an error condition.
>
> As far I know we did not change the bus speed or anything, but some
> cards need and i2c quirk to work correctly with the clients.
>
> Mike recently changed the old quirk with good reasons and it was widely
> tested, also by me, without any negative effect seen.
>
> Maybe your card is a rare case needing the old quirk.
>
> You could try to change the quirk in saa7134-i2c.c
>
> static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
> struct i2c_msg *msgs, int num)
> {
> struct saa7134_dev *dev = i2c_adap->algo_data;
> enum i2c_status status;
> unsigned char data;
> int addr,rc,i,byte;
>
> status = i2c_get_status(dev);
> if (!i2c_is_idle(status))
> if (!i2c_reset(dev))
> return -EIO;
>
> d2printk("start xfer\n");
> d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
> for (i = 0; i < num; i++) {
> if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
> /* send address */
> d2printk("send address\n");
> addr = msgs[i].addr << 1;
> if (msgs[i].flags & I2C_M_RD)
> addr |= 1;
> if (i > 0 && msgs[i].flags & I2C_M_RD && msgs[i].addr != 0x40) {
> /* workaround for a saa7134 i2c bug
> * needed to talk to the mt352 demux
> * thanks to pinnacle for the hint */
> int quirk = 0xfe; <--------------------------------------
> d1printk(" [%02x quirk]",quirk);
> i2c_send_byte(dev,START,quirk);
> i2c_recv_byte(dev);
> }
>
> back to 0xfd.
>
> Cheers,
> Hermann
>
H Hermann
thanks for your suggestion .
No improvement with changing the quirk to 0xfd ,
I still get the same error messages :
i2c-adapter i2c-1: Invalid 7-bit address 0x7a
saa7133[0]: i2c xfer: < 8e >
input: i2c IR (Pinnacle PCTV) as /class/input/input4
ir-kbd-i2c: i2c IR (Pinnacle PCTV) detected at i2c-1/1-0047/ir0 [saa7133[0]]
saa7133[0]: i2c xfer: < 8f ERROR: ARB_LOST
saa7133[0]: i2c xfer: < 84 ERROR: NO_DEVICE
saa7133[0]: i2c xfer: < 86 ERROR: ARB_LOST
saa7133[0]: i2c xfer: < 94 ERROR: NO_DEVICE
saa7133[0]: i2c xfer: < 96 ERROR: ARB_LOST
saa7133[0]: i2c xfer: < c0 ERROR: NO_DEVICE
saa7133[0]: i2c xfer: < c2 ERROR: NO_DEVICE
saa7133[0]: i2c xfer: < c4 ERROR: NO_DEVICE
saa7133[0]: i2c xfer: < c6 ERROR: NO_DEVICE
saa7133[0]: i2c xfer: < c8 ERROR: NO_DEVICE
Regards
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