[Intel-gfx] [BXT MIPI PATCH v2 13/13] drm/i915: Added BXT DSI backlight support

[Uma Shankar]

DSI backlight support for bxt is added.

TODO: There is no support for backlight control in drm panel
      framework. This will be added as part of VBT version patches
      fixing the backlight sequence.

v2: Fixed Jani's review comments from previous patch. Added the
    BXT DSI backlight code in this patch. Backlight setup and
    enable/disable code for backlight is added in intel_dsi.c.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/intel_dsi.c |   25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index d0b26c8..36fcb86 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -431,6 +431,7 @@ static void intel_dsi_enable(struct intel_encoder *encoder)
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	struct intel_connector *intel_connector = intel_dsi->attached_connector;
 	enum port port;
 
 	DRM_DEBUG_KMS("\n");
@@ -451,6 +452,16 @@ static void intel_dsi_enable(struct intel_encoder *encoder)
 
 		intel_dsi_port_enable(encoder);
 	}
+
+	if (IS_BROXTON(dev)) {
+		if (intel_dsi->backlight_on_delay >= 20)
+			msleep(intel_dsi->backlight_on_delay);
+		else
+			usleep_range(intel_dsi->backlight_on_delay * 1000,
+					(intel_dsi->backlight_on_delay * 1000) + 500);
+
+		intel_panel_enable_backlight(intel_connector);
+	}
 }
 
 static void intel_dsi_pre_enable(struct intel_encoder *encoder)
@@ -615,10 +626,20 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder)
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	struct intel_connector *intel_connector = intel_dsi->attached_connector;
 	u32 val;
 
 	DRM_DEBUG_KMS("\n");
 
+	if (IS_BROXTON(dev)) {
+		intel_panel_disable_backlight(intel_connector);
+		if (intel_dsi->backlight_off_delay >= 20)
+			msleep(intel_dsi->backlight_off_delay);
+		else
+			usleep_range(intel_dsi->backlight_off_delay * 1000,
+				(intel_dsi->backlight_off_delay * 1000) + 500);
+	}
+
 	intel_dsi_disable(encoder);
 
 	intel_dsi_clear_device_ready(encoder);
@@ -1213,9 +1234,11 @@ void intel_dsi_init(struct drm_device *dev)
 	}
 
 	intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
+	if (IS_BROXTON(dev))
+		intel_panel_setup_backlight(connector,
+			intel_encoder->crtc_mask == (1 << PIPE_A) ? PIPE_A : PIPE_B);
 
 	return;
-
 err:
 	drm_encoder_cleanup(&intel_encoder->base);
 	kfree(intel_dsi);
-- 
1.7.9.5