From dc652f90e088798bfa31f496ba994ddadd5d5680 Mon Sep 17 00:00:00 2001 From: Jani Nikula Date: Fri, 12 Apr 2013 15:18:38 +0300 Subject: [PATCH] drm/i915: ensure single initialization and cleanup of backlight device Backlight cleanup in the eDP connector destroy callback caused the backlight device to be removed on some systems that first initialized LVDS and then attempted to initialize eDP. Prevent multiple backlight initializations, and ensure backlight cleanup is only done once by moving it to modeset cleanup. A small wrinkle is the introduced asymmetry in backlight setup/cleanup. This could be solved by adding refcounting, but it seems overkill considering that there should only ever be one backlight device. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=55701 Signed-off-by: Jani Nikula Tested-by: Peter Verthez Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 3 +++ drivers/gpu/drm/i915/intel_dp.c | 5 +---- drivers/gpu/drm/i915/intel_lvds.c | 1 - drivers/gpu/drm/i915/intel_panel.c | 7 ++++++- 4 files changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 51871c248d6d..7672f3e49df1 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -9423,6 +9423,9 @@ void intel_modeset_cleanup(struct drm_device *dev) /* flush any delayed tasks or pending work */ flush_scheduled_work(); + /* destroy backlight, if any, before the connectors */ + intel_panel_destroy_backlight(dev); + drm_mode_config_cleanup(dev); intel_cleanup_overlay(dev); diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 173add1d819e..8845e82ec9ed 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -2474,17 +2474,14 @@ done: static void intel_dp_destroy(struct drm_connector *connector) { - struct drm_device *dev = connector->dev; struct intel_dp *intel_dp = intel_attached_dp(connector); struct intel_connector *intel_connector = to_intel_connector(connector); if (!IS_ERR_OR_NULL(intel_connector->edid)) kfree(intel_connector->edid); - if (is_edp(intel_dp)) { - intel_panel_destroy_backlight(dev); + if (is_edp(intel_dp)) intel_panel_fini(&intel_connector->panel); - } drm_sysfs_connector_remove(connector); drm_connector_cleanup(connector); diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index ca2d903c19bb..f36f1baabd5a 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -631,7 +631,6 @@ static void intel_lvds_destroy(struct drm_connector *connector) if (!IS_ERR_OR_NULL(lvds_connector->base.edid)) kfree(lvds_connector->base.edid); - intel_panel_destroy_backlight(connector->dev); intel_panel_fini(&lvds_connector->base.panel); drm_sysfs_connector_remove(connector); diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 7874cecc2863..eb5e6e95f3c7 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -428,6 +428,9 @@ int intel_panel_setup_backlight(struct drm_connector *connector) intel_panel_init_backlight(dev); + if (WARN_ON(dev_priv->backlight.device)) + return -ENODEV; + memset(&props, 0, sizeof(props)); props.type = BACKLIGHT_RAW; props.brightness = dev_priv->backlight.level; @@ -453,8 +456,10 @@ int intel_panel_setup_backlight(struct drm_connector *connector) void intel_panel_destroy_backlight(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; - if (dev_priv->backlight.device) + if (dev_priv->backlight.device) { backlight_device_unregister(dev_priv->backlight.device); + dev_priv->backlight.device = NULL; + } } #else int intel_panel_setup_backlight(struct drm_connector *connector) -- 2.20.1