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| author | Sonika Jindal <sonika.jindal@intel.com> | 2015-05-06 15:05:48 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-05-08 14:03:41 +0300 |
| commit | 9e45803465417acfaaefc331d59dd7e6cf06110b (patch) | |
| tree | f401b7a8d0fc16ba78a4e4c755a2ab5a0cc92860 /drivers/gpu/drm/i915/intel_bios.c | |
| parent | 983b4b9def913991ef829ca635f1b3e7dd391c1b (diff) | |
| download | linux-9e45803465417acfaaefc331d59dd7e6cf06110b.tar.xz | |
drm/i915/skl: Add module parameter to select edp vswing table
This provides an option to override the value set by VBT
for selecting edp Vswing Pre-emph setting table.
v2: Adding comment about this being a temporary workaround and
making the parameter read-only (Jani)
v3: Changing mode to 0400 instead of 0 (Jani)
https://bugs.freedesktop.org/show_bug.cgi?id=89554
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_bios.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index c08368c03dad..cee596d0a6a2 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -672,8 +672,13 @@ parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb) if (bdb->version >= 173) { uint8_t vswing; - vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF; - dev_priv->vbt.edp_low_vswing = vswing == 0; + /* Don't read from VBT if module parameter has valid value*/ + if (i915.edp_vswing) { + dev_priv->edp_low_vswing = i915.edp_vswing == 1; + } else { + vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF; + dev_priv->edp_low_vswing = vswing == 0; + } } } |