Re: [PATCH 13/13] IR: Port ene driver to new IR subsystem and enable it.

[Maxim Levitsky <maximlevitsky@gmail.com>]

On Fri, 2010-07-30 at 07:51 -0400, Jon Smirl wrote: 
> On Fri, Jul 30, 2010 at 7:36 AM, Maxim Levitsky <maximlevitsky@gmail.com> wrote:
> > On Thu, 2010-07-29 at 23:46 -0400, Andy Walls wrote:
> >> On Thu, 2010-07-29 at 22:39 -0400, Jon Smirl wrote:
> >> > On Thu, Jul 29, 2010 at 10:17 PM, Maxim Levitsky
> >> > <maximlevitsky@gmail.com> wrote:
> >> > > note that error_adjustment module option is added.
> >> > > This allows to reduce input samples by a percent.
> >> > > This makes input on my system more correct.
> >> > >
> >> > > Default is 4% as it works best here.
> >> > >
> >> > > Note that only normal input is adjusted. I don't know
> >> > > what adjustments to apply to fan tachometer input.
> >> > > Maybe it is accurate already.
> >> >
> >> > Do you have the manual for the ENE chip in English? or do you read Chinese?
> >>
> >> The datasheet for a similar chip, the KB3700, is out there in English,
> >> but it doesn't have CIR.
> >>
> >> You might find these links mildly interesting:
> >>
> >> http://www.coreboot.org/Embedded_controller
> >> http://wiki.laptop.org/go/Embedded_controller
> >> http://lists.laptop.org/pipermail/openec/2008-July/000108.html
> >
> > Nope, I have read that.
> >>
> >> Regards,
> >> Andy
> >>
> >> > Maybe you can figure out why the readings are off by 4%. I suspect
> >> > that someone has set a clock divider wrong when programming the chip.
> >> > For example setting the divider for a 25Mhz clock when the clock is
> >> > actually 26Mhz would cause the error you are seeing. Or they just made
> >> > a mistake in computing the divisor. It is probably a bug in the BIOS
> >> > of your laptop.  If that's the case you could add a quirk in the
> >> > system boot code to fix the register setting.
> >
> > I figured out how windows driver compensates for the offset, and do the
> > same in my driver. I think the problem is solved.
> >
> 
> Should that be a <= or >= instead of !=?
> +       if (pll_freq != 1000)

This is how its done in windows driver. 
> 
> Programming the PLL wrong would cause the 4% error.
> 
>        hw_revision = ene_hw_read_reg(dev, ENE_HW_VERSION);
>        old_ver = ene_hw_read_reg(dev, ENE_HW_VER_OLD);
> 
> +       pll_freq = (ene_hw_read_reg(dev, ENE_PLLFRH) << 4) +
> +               (ene_hw_read_reg(dev, ENE_PLLFRL) >> 2);
> +
> +       if (pll_freq != 1000)
> +               dev->rx_period_adjust = 4;
> +       else
> +               dev->rx_period_adjust = 2;
> +
> +
> +       ene_printk(KERN_NOTICE, "PLL freq = %d\n", pll_freq);
> +
>        if (hw_revision == 0xFF) {
> 
> 
> 
> >
> > Best regards,
> > Maxim Levitsky
> >
> >
> 
> 
>