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drm/gma500/cdv: Check vbt config bits when detecting lvds panels

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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:
Patrik Jakobsson 2019-04-16 13:46:07 +02:00 committed by Greg Kroah-Hartman
parent 2418da0204
commit bd5cd7587a
3 changed files with 7 additions and 0 deletions
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3
drivers/gpu/drm/gma500/cdv_intel_lvds.c
View file

@ -594,6 +594,9 @@ void cdv_intel_lvds_init(struct drm_device *dev,
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");

3
drivers/gpu/drm/gma500/intel_bios.c
View file

@ -436,6 +436,9 @@ parse_driver_features(struct drm_psb_private *dev_priv,
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;

1
drivers/gpu/drm/gma500/psb_drv.h
View file

@ -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;