drm/i915: Fix VLV PLL LPF coefficients for DAC
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 Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -4404,6 +4404,7 @@ static void vlv_update_pll(struct intel_crtc *crtc)
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/* Set HBR and RBR LPF coefficients */
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if (crtc->config.port_clock == 162000 ||
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intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_ANALOG) ||
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intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_HDMI))
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vlv_dpio_write(dev_priv, DPIO_LFP_COEFF(pipe),
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0x005f0021);
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