I had a plan to rework I2C handling a lot more,
than log the changes.
I wrote a patch that uses I2C IRQ.
I had a feeling that it worked well (with old single CPU desktop computer):
framerate with HDTV was low, but it was glitchless.
Do you want to have the patch to be sent for you?
I think that I solved in the patch "robust I2C command + exact IRQ response for
that command",
so that those two will not get out of sync.
I tried to rework the patch to make a bit smaller patch,
but I couldn't test the new one: hardware is too broken.
Regards,
Marko
01.04.2012 18:53, Steinar H. Gunderson kirjoitti:
> From: "Steinar H. Gunderson" <se...@samfundet.no>
>
> On I2C reads and writes, show if we had any timeouts in the debug output.
>
> Signed-off-by: Steinar H. Gunderson <se...@samfundet.no>
> ---
> drivers/media/dvb/mantis/mantis_i2c.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/dvb/mantis/mantis_i2c.c
> b/drivers/media/dvb/mantis/mantis_i2c.c
> index e779451..ddd1922 100644
> --- a/drivers/media/dvb/mantis/mantis_i2c.c
> +++ b/drivers/media/dvb/mantis/mantis_i2c.c
> @@ -38,6 +38,7 @@
> static int mantis_i2c_read(struct mantis_pci *mantis, const struct i2c_msg
> *msg)
> {
> u32 rxd, i, stat, trials;
> + u32 timeouts = 0;
>
> dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <R>[ ",
> __func__, msg->addr);
> @@ -60,6 +61,9 @@ static int mantis_i2c_read(struct mantis_pci *mantis, const
> struct i2c_msg *msg)
> if (stat & MANTIS_INT_I2CDONE)
> break;
> }
> + if (trials == TRIALS) {
> + ++timeouts;
> + }
>
> dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
>
> @@ -69,6 +73,9 @@ static int mantis_i2c_read(struct mantis_pci *mantis, const
> struct i2c_msg *msg)
> if (stat & MANTIS_INT_I2CRACK)
> break;
> }
> + if (trials == TRIALS) {
> + ++timeouts;
> + }
>
> dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
>
> @@ -76,7 +83,11 @@ static int mantis_i2c_read(struct mantis_pci *mantis,
> const struct i2c_msg *msg)
> msg->buf[i] = (u8)((rxd >> 8) & 0xFF);
> dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
> }
> - dprintk(MANTIS_INFO, 0, "]\n");
> + if (timeouts) {
> + dprintk(MANTIS_INFO, 0, "] %d timeouts\n", timeouts);
> + } else {
> + dprintk(MANTIS_INFO, 0, "]\n");
> + }
>
> return 0;
> }
> @@ -85,6 +96,7 @@ static int mantis_i2c_write(struct mantis_pci *mantis,
> const struct i2c_msg *msg
> {
> int i;
> u32 txd = 0, stat, trials;
> + u32 timeouts = 0;
>
> dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <W>[ ",
> __func__, msg->addr);
> @@ -108,6 +120,9 @@ static int mantis_i2c_write(struct mantis_pci *mantis,
> const struct i2c_msg *msg
> if (stat & MANTIS_INT_I2CDONE)
> break;
> }
> + if (trials == TRIALS) {
> + ++timeouts;
> + }
>
> dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
>
> @@ -117,10 +132,17 @@ static int mantis_i2c_write(struct mantis_pci *mantis,
> const struct i2c_msg *msg
> if (stat & MANTIS_INT_I2CRACK)
> break;
> }
> + if (trials == TRIALS) {
> + ++timeouts;
> + }
>
> dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
> }
> - dprintk(MANTIS_INFO, 0, "]\n");
> + if (timeouts) {
> + dprintk(MANTIS_INFO, 0, "] %d timeouts\n", timeouts);
> + } else {
> + dprintk(MANTIS_INFO, 0, "]\n");
> + }
>
> return 0;
> }
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
