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drm/gma500/cdv: Check vbt config bits when detecting lvds panels
commit 7c42063686
upstream.
Some machines have an lvds child device in vbt even though a panel is
not attached. To make detection more reliable we now also check the lvds
config bits available in the vbt.
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1665766
Cc: stable@vger.kernel.org
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190416114607.1072-1-patrik.r.jakobsson@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
2418da0204
commit
bd5cd7587a
3 changed files with 7 additions and 0 deletions
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@ -594,6 +594,9 @@ void cdv_intel_lvds_init(struct drm_device *dev,
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int pipe;
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u8 pin;
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if (!dev_priv->lvds_enabled_in_vbt)
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return;
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pin = GMBUS_PORT_PANEL;
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if (!lvds_is_present_in_vbt(dev, &pin)) {
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DRM_DEBUG_KMS("LVDS is not present in VBT\n");
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@ -436,6 +436,9 @@ parse_driver_features(struct drm_psb_private *dev_priv,
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if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
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dev_priv->edp.support = 1;
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dev_priv->lvds_enabled_in_vbt = driver->lvds_config != 0;
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DRM_DEBUG_KMS("LVDS VBT config bits: 0x%x\n", driver->lvds_config);
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/* This bit means to use 96Mhz for DPLL_A or not */
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if (driver->primary_lfp_id)
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dev_priv->dplla_96mhz = true;
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@ -538,6 +538,7 @@ struct drm_psb_private {
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int lvds_ssc_freq;
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bool is_lvds_on;
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bool is_mipi_on;
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bool lvds_enabled_in_vbt;
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u32 mipi_ctrl_display;
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unsigned int core_freq;
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