From: Mika Kahola <mika.kahola@intel.com>
To: intel-gfx@lists.freedesktop.org
Subject: [RESEND FOR CI PATCH v2] drm/i915: Fix eDP low vswing for Broadwell
Date: Wed, 13 Apr 2016 12:11:15 +0300 [thread overview]
Message-ID: <1460538675-16289-1-git-send-email-mika.kahola@intel.com> (raw)
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)
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94087
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 921edf1..d9af2de 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -443,9 +443,17 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
} else if (IS_BROADWELL(dev_priv)) {
ddi_translations_fdi = bdw_ddi_translations_fdi;
ddi_translations_dp = bdw_ddi_translations_dp;
- ddi_translations_edp = bdw_ddi_translations_edp;
+
+ if (dev_priv->edp_low_vswing) {
+ ddi_translations_edp = bdw_ddi_translations_edp;
+ n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_edp);
+ } else {
+ ddi_translations_edp = bdw_ddi_translations_dp;
+ n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
+ }
+
ddi_translations_hdmi = bdw_ddi_translations_hdmi;
- n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_edp);
+
n_dp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
hdmi_default_entry = 7;
--
1.9.1
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next reply other threads:[~2016-04-13 9:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-13 9:11 Mika Kahola [this message]
2016-04-13 17:07 ` ✗ Fi.CI.BAT: failure for drm/i915: Fix eDP low vswing for Broadwell (rev3) Patchwork
2016-04-14 16:20 ` Ville Syrjälä
2016-04-15 7:30 ` Tomi Sarvela
2016-04-20 11:31 ` [RESEND FOR CI PATCH v2] drm/i915: Fix eDP low vswing for Broadwell Mika Kahola
2016-04-20 11:36 ` Jani Nikula
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