From: Zhao Yakui Date: Fri, 11 Dec 2009 01:26:11 +0000 (+0800) Subject: drm/i915: Update LVDS connector status when receiving ACPI LID event X-Git-Tag: firefly_0821_release~11625^2~373 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d3e4d5f8ccd3dfb33d9f2907b5290509766352ea;p=firefly-linux-kernel-4.4.55.git drm/i915: Update LVDS connector status when receiving ACPI LID event commit a2565377a5c31e25c77c7cabaf6752abe9a2d83a upstream. Dirk reports that nothing is displayed on LVDS when using ubuntu 9.1 after close/reopen the LID. And I also reproduce this issue on another laptop. After some tests and debug, it seems that it is related with that the LVDS status is not updated in time in course of suspend/resume. Now the LID state is used to check whether the LVDS is connected or disconnected. And when the LID is closed, it means that the LVDS is disconnected. When it is reopened, it means that the LVDS is connected. At the same time on some distributions the LID event is also used to put the system into suspend state. When the LID is closed, the system will enter the suspend state. When the LID is reopened, the system will be resumed. In such case when the LID is closed, user-space script will receive the LID notification event and detect the LVDS as disconnected. Then the system will enter the suspended state. When the LID is reopened, the system will be resumed. As the LVDS status is not updated in course of resume, it will cause that the LVDS connector is marked as unused and disabled. After the resume is finished,user-space script will try to configure the display mode for LVDS. But unfortunately as the LVDS status is not updated in time and it is still marked as disconnected, the LVDS and its corresponding CRTC will be disabled again in the function of drm_helper_disable_unused_functions after changing mode for LVDS. So we had better check and update the status of LVDS connector after receiving the LID notication event. Then after the system is resumed from suspended state, we can set the display mode for LVDS correctly. Signed-off-by: Zhao Yakui Reported-by: Dirk Hohndel Reviewed-by: Jesse Barnes Signed-off-by: Eric Anholt Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index ecbafd036858..791fded1378d 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -546,6 +546,7 @@ typedef struct drm_i915_private { struct timer_list idle_timer; bool busy; u16 orig_clock; + struct drm_connector *int_lvds_connector; } drm_i915_private_t; /** driver private structure attached to each drm_gem_object */ diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index 05598ae10c4b..0e0e4b47a7d0 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -679,7 +679,14 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val, struct drm_i915_private *dev_priv = container_of(nb, struct drm_i915_private, lid_notifier); struct drm_device *dev = dev_priv->dev; + struct drm_connector *connector = dev_priv->int_lvds_connector; + /* + * check and update the status of LVDS connector after receiving + * the LID nofication event. + */ + if (connector) + connector->status = connector->funcs->detect(connector); if (!acpi_lid_open()) { dev_priv->modeset_on_lid = 1; return NOTIFY_OK; @@ -1085,6 +1092,8 @@ out: DRM_DEBUG("lid notifier registration failed\n"); dev_priv->lid_notifier.notifier_call = NULL; } + /* keep the LVDS connector */ + dev_priv->int_lvds_connector = connector; drm_sysfs_connector_add(connector); return;