From: Ville Syrj?l? <ville.syrjala at linux.intel.com> I just got confirmation that we're using some old values for the PLL LPF coefficients for DP RBR/HDMI/DAC on VLV. The VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_9 document lists both values by mistake, and apparently we had picked the wrong one. Change the coefficients to the recommended values. Changing the value doesn't appear to destabilize the VGA output picture even with my sensitive HP ZR24w display. Also HDMI output to my TV still works fine. Signed-off-by: Ville Syrj?l? <ville.syrjala at linux.intel.com> --- 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 fc2af13..b423432 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4448,7 +4448,7 @@ static void vlv_update_pll(struct intel_crtc *crtc) intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_ANALOG) || intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_HDMI)) vlv_dpio_write(dev_priv, DPIO_LPF_COEFF(pipe), - 0x005f0021); + 0x009f0003); else vlv_dpio_write(dev_priv, DPIO_LPF_COEFF(pipe), 0x00d0000f); -- 1.8.1.5
