On Mon, Feb 16, 2015 at 01:21:34PM +0200, Ville Syrjälä wrote:
> On Mon, Feb 16, 2015 at 03:07:59PM +0530, Vijay Purushothaman wrote:
> > As per the recommendation from PHY team, limit the max vco supported in CHV to 6.48 GHz
> >
> > Signed-off-by: Vijay Purushothaman <vijay.a.purushothaman@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_display.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 3b0fe9f..4e710f6 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -390,7 +390,7 @@ static const intel_limit_t intel_limits_chv = {
> > * them would make no difference.
> > */
> > .dot = { .min = 25000 * 5, .max = 540000 * 5},
> > - .vco = { .min = 4860000, .max = 6700000 },
> > + .vco = { .min = 4860000, .max = 6480000 },
>
> I have a patch here to reduce the minimum to 4.80 GHz, otherwise I can't
> get my 2560x1440 HDMI display working (241.5 MHz clock). With that change
> we still have a gap (233-240 MHz) in the frequencies we can produce.
> Reducing the max to 6.48 GHz will increase that gap to 216-240 MHz, which
> is a bit unfortunate. But if that's the recommendation we should follow
> it I suppose, and hope no HDMI displays will want such frequencies.
>
> Is there an updated spreadsheet available with the new limits? Quite a
> few of the frequencies in the original spreadsheet did have vco>6.48
> GHz.
>
> I any case this seems OK, so
> Acked-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
This one doesn't apply any more ... still needed?
-Daniel
>
> > .n = { .min = 1, .max = 1 },
> > .m1 = { .min = 2, .max = 2 },
> > .m2 = { .min = 24 << 22, .max = 175 << 22 },
> > --
> > 1.7.9.5
> >
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>
> --
> Ville Syrjälä
> Intel OTC
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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