Re: [PATCH] drm/i915: Adjust BXT HDMI port clock limits

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Fri, Jul 10, 2015 at 02:18:57PM +0100, Damien Lespiau wrote:
> On Fri, Jul 10, 2015 at 04:09:42PM +0300, Imre Deak wrote:
> > On ma, 2015-07-06 at 14:44 +0300, ville.syrjala@linux.intel.com wrote:
> > > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > > 
> > > Since
> > >  commit e62925567c7926e78bc8ca976cde5c28ea265a49
> > >  Author: Vandana Kannan <vandana.kannan@intel.com>
> > >  Date:   Wed Jul 1 17:02:57 2015 +0530
> > > 
> > >     drm/i915/bxt: BUNs related to port PLL
> > > 
> > > BXT DPLL can now generate frequencies in the 216-223 MHz range.
> > > Adjust the HDMI port clock checks to account for the reduced range
> > > of invalid frequencies.
> > > 
> > > Cc: Vandana Kannan <vandana.kannan@intel.com>
> > > Cc: Imre Deak <imre.deak@intel.com>
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > Ville wrote a tool for CHV that calculates the valid frequencies based
> > on the algorithm in the kernel. With the help of that I verified that
> > this matches the list of target frequencies bxt_find_best_dpll() will
> > accept, so:
> 
> Could we have that tool in i-g-t?

We could lift all the .find_dpll routines from the kernel into i-g-t.
The only real concern is that we'll forget to update the i-g-t copies
when changing the kernel. But I guess it would still be easier to just
update them slightly when noticing that rather than having to lift them
from the kernel all over again.

-- 
Ville Syrjälä
Intel OTC
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