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path: root/drivers/gpu/drm/i915/intel_panel.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_panel.c')
-rw-r--r--drivers/gpu/drm/i915/intel_panel.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index e480cf41c53..20ebc3e83d3 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -845,11 +845,14 @@ static int intel_backlight_device_get_brightness(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct drm_device *dev = connector->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
+ intel_runtime_pm_get(dev_priv);
mutex_lock(&dev->mode_config.mutex);
ret = intel_panel_get_backlight(connector);
mutex_unlock(&dev->mode_config.mutex);
+ intel_runtime_pm_put(dev_priv);
return ret;
}
@@ -1104,6 +1107,59 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
intel_backlight_device_unregister(intel_connector);
}
+/**
+ * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
+ * @dev: drm device
+ * @fixed_mode : panel native mode
+ * @connector: LVDS/eDP connector
+ *
+ * Return downclock_avail
+ * Find the reduced downclock for LVDS/eDP in EDID.
+ */
+struct drm_display_mode *
+intel_find_panel_downclock(struct drm_device *dev,
+ struct drm_display_mode *fixed_mode,
+ struct drm_connector *connector)
+{
+ struct drm_display_mode *scan, *tmp_mode;
+ int temp_downclock;
+
+ temp_downclock = fixed_mode->clock;
+ tmp_mode = NULL;
+
+ list_for_each_entry(scan, &connector->probed_modes, head) {
+ /*
+ * If one mode has the same resolution with the fixed_panel
+ * mode while they have the different refresh rate, it means
+ * that the reduced downclock is found. In such
+ * case we can set the different FPx0/1 to dynamically select
+ * between low and high frequency.
+ */
+ if (scan->hdisplay == fixed_mode->hdisplay &&
+ scan->hsync_start == fixed_mode->hsync_start &&
+ scan->hsync_end == fixed_mode->hsync_end &&
+ scan->htotal == fixed_mode->htotal &&
+ scan->vdisplay == fixed_mode->vdisplay &&
+ scan->vsync_start == fixed_mode->vsync_start &&
+ scan->vsync_end == fixed_mode->vsync_end &&
+ scan->vtotal == fixed_mode->vtotal) {
+ if (scan->clock < temp_downclock) {
+ /*
+ * The downclock is already found. But we
+ * expect to find the lower downclock.
+ */
+ temp_downclock = scan->clock;
+ tmp_mode = scan;
+ }
+ }
+ }
+
+ if (temp_downclock < fixed_mode->clock)
+ return drm_mode_duplicate(dev, tmp_mode);
+ else
+ return NULL;
+}
+
/* Set up chip specific backlight functions */
void intel_panel_init_backlight_funcs(struct drm_device *dev)
{
@@ -1157,4 +1213,8 @@ void intel_panel_fini(struct intel_panel *panel)
if (panel->fixed_mode)
drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
+
+ if (panel->downclock_mode)
+ drm_mode_destroy(intel_connector->base.dev,
+ panel->downclock_mode);
}