On Tue, 2010-02-02 at 13:29 -0200, Mauro Carvalho Chehab wrote:
> Hi Andy,
>
> This patch has never been applied or nacked. From your last comment, it
> seems that you're waiting for Aleksandr Signed-of-by:.
>
> If this is still the case, I suggest you to wait for a couple days. If he
> doesn't
> send it, it is safe to add it without his SOB, since it is really a trivial
> change.
I'd like to look at this one once more. The extra 50 ms and another
reset may be avoidable.
cx25840-core.c:set_input() gets called for s_frequency so I'd like not
to add 50 ms if not needed.
Regards,
Andy
> Cheers,
> Mauro.
>
> Andy Walls wrote:
> > On Sun, 2009-10-11 at 04:01 +0300, Aleksandr V. Piskunov wrote:
> >> On Tue, Oct 06, 2009 at 11:11:59AM +0300, Aleksandr V. Piskunov wrote:
> >>> On Tue, Oct 06, 2009 at 11:04:06AM +0300, Aleksandr V. Piskunov wrote:
> >>>> Added FM radio support to Avermedia AVerTV MCE 116 Plus card
> >>>>
> >>> What leaves me puzzled, radio only works ok with ivtv newi2c=1
> >>>
> >>> With default newi2c audio is tinny, metallic, with some strange static.
> >>> Similar problem with pvr-150 was reported years ago, guess issue is still
> >>> unresolved, perhaps something with cx25840..
> >> This particular "tinny" audio problem is definitely I2C speed related, to
> >> be
> >> more precise, audio only goes bad if i2c-algo-bit is being run with udelay
> >> less than 15, i.e. i2c bus frequency is higher than 30 KHz.
> >>
> >> So with default udelay=10 or udelay=5 (optimal for IR reciever on that
> >> board)
> >> radio goes bad. Running with newi2c=1 is ok, but again it isn't optimal
> >> for IR
> >> reciever on AVerTV M116.
> >>
> >> I2C reads/writes to cx25840 themself are ok, verified using register
> >> readback
> >> after each write/write4. Problem seems to be that with cx25840 register
> >> writes
> >> coming too fast on higher i2c bus speed, switching register 0x808 _from_
> >> TV standard autodetection mode (0xff) _to_ FM radio mode (0xf9) leaves
> >> chip
> >> audio detection routine in inconsistent state.
> >>
> >> The only solution I found is to do standard routine (assert_reset + write +
> >> deassert_reset) followed by 50ms delay and another reset.
> >>
> >> Following patch works_for_me, can be improved to only delay/doublereset
> >> when
> >> really needed, etc. Andy, could you comment/review?
> >
> > Aleksandr,
> >
> > Could you provide your Signed-off-by for this patch? I'm going to
> > commit it as is.
> >
> > Thanks,
> > Andy
> >
> >> diff --git a/linux/drivers/media/video/cx25840/cx25840-core.c
> >> b/linux/drivers/media/video/cx25840/cx25840-core.c
> >> --- a/linux/drivers/media/video/cx25840/cx25840-core.c
> >> +++ b/linux/drivers/media/video/cx25840/cx25840-core.c
> >> @@ -626,7 +642,13 @@
> >> if (state->radio) {
> >> cx25840_write(client, 0x808, 0xf9);
> >> cx25840_write(client, 0x80b, 0x00);
> >> - }
> >> + /* Double reset cx2384x after setting FM radio mode, helps to
> >> + avoid "tinny" audio when ivtv I2C bus is being run on
> >> + frequency higher than 30 KHz */
> >> + cx25840_and_or(client, 0x810, ~0x01, 0);
> >> + msleep(50);
> >> + cx25840_and_or(client, 0x810, ~0x01, 1);
> >> + }
> >> else if (std & V4L2_STD_525_60) {
> >> /* Certain Hauppauge PVR150 models have a hardware bug
> >> that causes audio to drop out. For these models the
> >>
> >> --
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> >
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