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drm/i915: Per-DDI I_boost override

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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>
This commit is contained in:
Antti Koskipaa
2015-07-10 14:10:55 +03:00
committed by Daniel Vetter
parent 622147fdad
commit 75067ddecf
4 changed files with 63 additions and 8 deletions
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38
drivers/gpu/drm/i915/intel_ddi.c
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@@ -440,6 +440,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 reg;
u32 iboost_bit = 0;
int i, n_hdmi_entries, n_dp_entries, n_edp_entries, hdmi_default_entry,
size;
int hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift;
@@ -466,6 +467,10 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
ddi_translations_hdmi =
skl_get_buf_trans_hdmi(dev, &n_hdmi_entries);
hdmi_default_entry = 8;
/* If we're boosting the current, set bit 31 of trans1 */
if (dev_priv->vbt.ddi_port_info[port].hdmi_boost_level ||
dev_priv->vbt.ddi_port_info[port].dp_boost_level)
iboost_bit = 1<<31;
} else if (IS_BROADWELL(dev)) {
ddi_translations_fdi = bdw_ddi_translations_fdi;
ddi_translations_dp = bdw_ddi_translations_dp;
@@ -526,7 +531,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
}
for (i = 0, reg = DDI_BUF_TRANS(port); i < size; i++) {
I915_WRITE(reg, ddi_translations[i].trans1);
I915_WRITE(reg, ddi_translations[i].trans1 | iboost_bit);
reg += 4;
I915_WRITE(reg, ddi_translations[i].trans2);
reg += 4;
@@ -541,7 +546,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
hdmi_level = hdmi_default_entry;
/* Entry 9 is for HDMI: */
I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans1);
I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans1 | iboost_bit);
reg += 4;
I915_WRITE(reg, ddi_translations_hdmi[hdmi_level].trans2);
reg += 4;
@@ -2078,18 +2083,35 @@ static void skl_ddi_set_iboost(struct drm_device *dev, u32 level,
struct drm_i915_private *dev_priv = dev->dev_private;
const struct ddi_buf_trans *ddi_translations;
uint8_t iboost;
uint8_t dp_iboost, hdmi_iboost;
int n_entries;
u32 reg;
/* VBT may override standard boost values */
dp_iboost = dev_priv->vbt.ddi_port_info[port].dp_boost_level;
hdmi_iboost = dev_priv->vbt.ddi_port_info[port].hdmi_boost_level;
if (type == INTEL_OUTPUT_DISPLAYPORT) {
ddi_translations = skl_get_buf_trans_dp(dev, &n_entries);
iboost = ddi_translations[port].i_boost;
if (dp_iboost) {
iboost = dp_iboost;
} else {
ddi_translations = skl_get_buf_trans_dp(dev, &n_entries);
iboost = ddi_translations[port].i_boost;
}
} else if (type == INTEL_OUTPUT_EDP) {
ddi_translations = skl_get_buf_trans_edp(dev, &n_entries);
iboost = ddi_translations[port].i_boost;
if (dp_iboost) {
iboost = dp_iboost;
} else {
ddi_translations = skl_get_buf_trans_edp(dev, &n_entries);
iboost = ddi_translations[port].i_boost;
}
} else if (type == INTEL_OUTPUT_HDMI) {
ddi_translations = skl_get_buf_trans_hdmi(dev, &n_entries);
iboost = ddi_translations[port].i_boost;
if (hdmi_iboost) {
iboost = hdmi_iboost;
} else {
ddi_translations = skl_get_buf_trans_hdmi(dev, &n_entries);
iboost = ddi_translations[port].i_boost;
}
} else {
return;
}