On Fri, 14 Jun 2013 14:02:52 +0300 ville.syrjala at linux.intel.com wrote: > From: Ville Syrj?l? <ville.syrjala at linux.intel.com> > > The current PLL settings produce a rather unstable picture when > I hook up a VLV to my HP ZR24w display via a VGA cable. > > According to VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_9, we should > use the the same LPF coefficients for DAC as we do for HDMI and RBR DP. > And indeed that seems to cure the shivers. > > v2: Add the name of the relevant document to the commit message > > Signed-off-by: Ville Syrj?l? <ville.syrjala at linux.intel.com> > --- > drivers/gpu/drm/i915/intel_display.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c > index 29f2c0d..465d6bc 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -4405,6 +4405,7 @@ static void vlv_update_pll(struct intel_crtc *crtc) > > /* Set HBR and RBR LPF coefficients */ > if (crtc->config.port_clock == 162000 || > + intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_ANALOG) || > intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_HDMI)) > vlv_dpio_write(dev_priv, DPIO_LFP_COEFF(pipe), > 0x005f0021); Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org> -- Jesse Barnes, Intel Open Source Technology Center
