From: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx> commit 7c420636860a719049fae9403e2c87804f53bdde 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@xxxxxxxxxxxxxxx Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx> Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20190416114607.1072-1-patrik.r.jakobsson@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/gma500/cdv_intel_lvds.c | 3 +++ drivers/gpu/drm/gma500/intel_bios.c | 3 +++ drivers/gpu/drm/gma500/psb_drv.h | 1 + 3 files changed, 7 insertions(+) --- a/drivers/gpu/drm/gma500/cdv_intel_lvds.c +++ b/drivers/gpu/drm/gma500/cdv_intel_lvds.c @@ -594,6 +594,9 @@ void cdv_intel_lvds_init(struct drm_devi int pipe; u8 pin; + if (!dev_priv->lvds_enabled_in_vbt) + return; + pin = GMBUS_PORT_PANEL; if (!lvds_is_present_in_vbt(dev, &pin)) { DRM_DEBUG_KMS("LVDS is not present in VBT\n"); --- a/drivers/gpu/drm/gma500/intel_bios.c +++ b/drivers/gpu/drm/gma500/intel_bios.c @@ -436,6 +436,9 @@ parse_driver_features(struct drm_psb_pri if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP) dev_priv->edp.support = 1; + dev_priv->lvds_enabled_in_vbt = driver->lvds_config != 0; + DRM_DEBUG_KMS("LVDS VBT config bits: 0x%x\n", driver->lvds_config); + /* This bit means to use 96Mhz for DPLL_A or not */ if (driver->primary_lfp_id) dev_priv->dplla_96mhz = true; --- a/drivers/gpu/drm/gma500/psb_drv.h +++ b/drivers/gpu/drm/gma500/psb_drv.h @@ -538,6 +538,7 @@ struct drm_psb_private { int lvds_ssc_freq; bool is_lvds_on; bool is_mipi_on; + bool lvds_enabled_in_vbt; u32 mipi_ctrl_display; unsigned int core_freq;
