diff options
| author | Antti Koskipaa <antti.koskipaa@linux.intel.com> | 2015-07-10 14:10:55 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-08-14 18:13:09 +0200 |
| commit | 75067ddecf21271631bc018d2fb23ddd09b66aae (patch) | |
| tree | 025b3cfb003926340197383bc9858a47ecc5a8ca /drivers/gpu/drm/i915/intel_bios.c | |
| parent | 622147fdad5425f6f572f84ce709303e5e0500b7 (diff) | |
| download | talos-op-linux-75067ddecf21271631bc018d2fb23ddd09b66aae.tar.gz talos-op-linux-75067ddecf21271631bc018d2fb23ddd09b66aae.zip | |
drm/i915: Per-DDI I_boost override
An OEM may request increased I_boost beyond the recommended values
by specifying an I_boost value to be applied to all swing entries for
a port. These override values are specified in VBT.
v2: rebase and remove unused iboost_bit variable
Issue: VIZ-5676
Signed-off-by: Antti Koskipaa <antti.koskipaa@linux.intel.com>
Reviewed-by: David Weinehall <david.weinehall@linux.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 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 990acc20771a..8e46149bafdd 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -886,6 +886,17 @@ err: memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence)); } +static u8 translate_iboost(u8 val) +{ + static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */ + + if (val >= ARRAY_SIZE(mapping)) { + DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val); + return 0; + } + return mapping[val]; +} + static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port, const struct bdb_header *bdb) { @@ -1001,6 +1012,16 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port, hdmi_level_shift); info->hdmi_level_shift = hdmi_level_shift; } + + /* Parse the I_boost config for SKL and above */ + if (bdb->version >= 196 && (child->common.flags_1 & IBOOST_ENABLE)) { + info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF); + DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n", + port_name(port), info->dp_boost_level); + info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4); + DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n", + port_name(port), info->hdmi_boost_level); + } } static void parse_ddi_ports(struct drm_i915_private *dev_priv, |
