On Fri, 13 Jun 2014 13:37:51 +0300 [email protected] wrote: > From: Ville Syrjälä <[email protected]> > > Drop the cdclk frequency to 200MHz on vlv when all pipes are off. In > theory we should be able to use 200MHz also when the pixel clock is at > most 90% of 200MHz. However in practice all we seem to get is a solid > color picture or an otherwise corrupted display. > > Signed-off-by: Ville Syrjälä <[email protected]> > --- > drivers/gpu/drm/i915/intel_display.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_display.c > b/drivers/gpu/drm/i915/intel_display.c > index 1f3985f..3a9b017 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -4520,14 +4520,19 @@ static int valleyview_calc_cdclk(struct > drm_i915_private *dev_priv, > * 400MHz > * So we check to see whether we're above 90% of the lower bin and > * adjust if needed. > + * > + * We seem to get an unstable or solid color picture at 200MHz. > + * Not sure what's wrong. For now use 200MHz only when all pipes > + * are off. > */ > if (max_pixclk > freq_320*9/10) > return 400000; > else if (max_pixclk > 266667*9/10) > return freq_320; > - else > + else if (max_pixclk > 0) > return 266667; > - /* Looks like the 200MHz CDclk freq doesn't work on some configs */ > + else > + return 200000; > } > > /* compute the max pixel clock for new configuration */
I guess this is safe, but optional (won't we be shutting off the clocks anyway?). Reviewed-by: Jesse Barnes <[email protected]> -- Jesse Barnes, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
