drm/i915: Fix eDP low vswing for Broadwell
commit 992e7a41f9fcc7bcd10e7d346aee5ed7a2c241cb upstream. It was noticed on bug #94087 that module parameter i915.edp_vswing=2 that should override the VBT setting to use default voltage swing (400 mV) was not applied for Broadwell. This patch provides a fix for this by checking if default i.e. higher voltage swing is requested to be used and applies the DDI translations table for DP instead of eDP (low vswing) table. v2: Combine two if statements into one (Jani) v3: Change dev_priv->edp_low_vswing to use dev_priv->vbt.edp.low_vswing Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94087 Signed-off-by: Mika Kahola <mika.kahola@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1461155942-7749-1-git-send-email-mika.kahola@intel.com Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> (cherry picked from commit 00983519214b61c1b9371ec2ed55a4dde773e384) [Jani: s/dev_priv->vbt.edp.low_vswing/dev_priv->edp_low_vswing/ to backport] Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -464,9 +464,17 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
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} else if (IS_BROADWELL(dev)) {
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ddi_translations_fdi = bdw_ddi_translations_fdi;
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ddi_translations_dp = bdw_ddi_translations_dp;
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ddi_translations_edp = bdw_ddi_translations_edp;
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if (dev_priv->edp_low_vswing) {
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ddi_translations_edp = bdw_ddi_translations_edp;
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n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_edp);
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} else {
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ddi_translations_edp = bdw_ddi_translations_dp;
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n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
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}
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ddi_translations_hdmi = bdw_ddi_translations_hdmi;
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n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_edp);
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n_dp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
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n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
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hdmi_default_entry = 7;
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