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Subject[PATCH 2/5] i915: Add native backlight control
Date
Not all systems expose a firmware or platform mechanism for changing the
backlight intensity on i915, so add native driver support.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: intel-gfx <intel-gfx@lists.freedesktop.org>
---
drivers/gpu/drm/i915/i915_drv.h | 4 ++
drivers/gpu/drm/i915/intel_dp.c | 7 +++
drivers/gpu/drm/i915/intel_drv.h | 2 +
drivers/gpu/drm/i915/intel_lvds.c | 5 ++
drivers/gpu/drm/i915/intel_opregion.c | 1 -
drivers/gpu/drm/i915/intel_panel.c | 67 +++++++++++++++++++++++++++++++++
6 files changed, 85 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 90414ae..f311ce4 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -36,6 +36,7 @@
#include <linux/io-mapping.h>
#include <linux/i2c.h>
#include <drm/intel-gtt.h>
+#include <linux/backlight.h>

/* General customization:
*/
@@ -679,6 +680,7 @@ typedef struct drm_i915_private {
int child_dev_num;
struct child_device_config *child_dev;
struct drm_connector *int_lvds_connector;
+ struct drm_connector *int_edp_connector;

bool mchbar_need_disable;

@@ -707,6 +709,8 @@ typedef struct drm_i915_private {

/* list of fbdev register on this device */
struct intel_fbdev *fbdev;
+
+ struct backlight_device *backlight;
} drm_i915_private_t;

/** driver private structure attached to each drm_gem_object */
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index c8e0055..7cfefb5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1639,6 +1639,11 @@ done:
static void
intel_dp_destroy (struct drm_connector *connector)
{
+ struct drm_device *dev = connector->dev;
+
+ if (intel_dpd_is_edp(dev))
+ intel_panel_backlight_destroy(dev);
+
drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
@@ -1868,6 +1873,8 @@ intel_dp_init(struct drm_device *dev, int output_reg)
DRM_MODE_TYPE_PREFERRED;
}
}
+ dev_priv->int_edp_connector = connector;
+ intel_panel_backlight_setup(dev);
}

intel_dp_add_properties(intel_dp, connector);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 21551fe..7917bec 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -256,6 +256,8 @@ extern void intel_pch_panel_fitting(struct drm_device *dev,
extern u32 intel_panel_get_max_backlight(struct drm_device *dev);
extern u32 intel_panel_get_backlight(struct drm_device *dev);
extern void intel_panel_set_backlight(struct drm_device *dev, u32 level);
+extern int intel_panel_backlight_setup(struct drm_device *dev);
+extern void intel_panel_backlight_destroy(struct drm_device *dev);

extern void intel_crtc_load_lut(struct drm_crtc *crtc);
extern void intel_encoder_prepare (struct drm_encoder *encoder);
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 4324a32..f69a7b8 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -569,6 +569,8 @@ static void intel_lvds_destroy(struct drm_connector *connector)
struct drm_device *dev = connector->dev;
struct drm_i915_private *dev_priv = dev->dev_private;

+ intel_panel_backlight_destroy(dev);
+
if (dev_priv->lid_notifier.notifier_call)
acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
drm_sysfs_connector_remove(connector);
@@ -1026,6 +1028,9 @@ out:
/* keep the LVDS connector */
dev_priv->int_lvds_connector = connector;
drm_sysfs_connector_add(connector);
+
+ intel_panel_backlight_setup(dev);
+
return;

failed:
diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 9b0d9a8..bf79c02 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -224,7 +224,6 @@ void intel_opregion_asle_intr(struct drm_device *dev)
asle->aslc = asle_stat;
}

-/* Only present on Ironlake+ */
void intel_opregion_gse_intr(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 92ff8f3..1eaa66e 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -218,3 +218,70 @@ void intel_panel_set_backlight(struct drm_device *dev, u32 level)
tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(BLC_PWM_CTL, tmp | level);
}
+
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+static int intel_panel_update_status(struct backlight_device *bd)
+{
+ struct drm_device *dev = bl_get_data(bd);
+ intel_panel_set_backlight(dev, bd->props.brightness);
+ return 0;
+}
+
+static int intel_panel_get_brightness(struct backlight_device *bd)
+{
+ struct drm_device *dev = bl_get_data(bd);
+ return intel_panel_get_backlight(dev);
+}
+
+static const struct backlight_ops intel_panel_bl_ops = {
+ .update_status = intel_panel_update_status,
+ .get_brightness = intel_panel_get_brightness,
+};
+
+int intel_panel_backlight_setup(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct backlight_properties props;
+ struct drm_connector *connector;
+
+ if (dev_priv->int_lvds_connector)
+ connector = dev_priv->int_lvds_connector;
+ else if (dev_priv->int_edp_connector)
+ connector = dev_priv->int_edp_connector;
+ else
+ return -ENODEV;
+
+ props.type = BACKLIGHT_RAW;
+ props.max_brightness = intel_panel_get_max_backlight(dev);
+ dev_priv->backlight =
+ backlight_device_register("intel_backlight",
+ &connector->kdev, dev,
+ &intel_panel_bl_ops, &props);
+
+ if (IS_ERR(dev_priv->backlight)) {
+ DRM_ERROR("Failed to register backlight: %ld\n",
+ PTR_ERR(dev_priv->backlight));
+ dev_priv->backlight = NULL;
+ return -ENODEV;
+ }
+ dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
+ return 0;
+}
+
+void intel_panel_backlight_destroy(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ if (dev_priv->backlight)
+ backlight_device_unregister(dev_priv->backlight);
+}
+#else
+int intel_panel_backlight_setup(struct drm_device *dev)
+{
+ return 0;
+}
+
+void intel_panel_backlight_destroy(struct drm_device *dev)
+{
+ return;
+}
+#endif
--
1.7.3.2


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