[Intel-gfx] [PATCH] drm/i915: Make G4X-style PLL search more permissive

[Adam Jackson]

On Fri, 2010-07-02 at 16:43 -0400, Adam Jackson wrote:

> Worst dotclock for Ironlake DAC refclk is 350000kHz (error 0.00571)
> Worst dotclock for Ironlake SL-LVDS refclk is 102321kHz (error 0.00524)
> Worst dotclock for Ironlake DL-LVDS refclk is 219642kHz (error 0.00488)
> Worst dotclock for Ironlake SL-LVDS SSC refclk is 84374kHz (error 0.00529)
> Worst dotclock for Ironlake DL-LVDS SSC refclk is 183035kHz (error 0.00488)
> Worst dotclock for G4X SDVO refclk is 50000kHz (error 0.17332)
> Worst dotclock for G4X HDMI refclk is 334400kHz (error 0.00478)
> Worst dotclock for G4X SL-LVDS refclk is 95571kHz (error 0.00449)
> Worst dotclock for G4X DL-LVDS refclk is 224000kHz (error 0.00510)
> 
> The SDVO number looks a bit suspicious, which I haven't tracked down
> yet.  But it's clear that the old threshold is too tight.

Well, that was easy.  We turn on 2x or 4x pixel multiplication below
100MHz.  Once I account for that I get:

Worst dotclock for G4X SDVO refclk is 267600kHz (error 0.00448)

- ajax
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