[Intel-gfx] [BXT MIPI PATCH v4 14/14] 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.

v3: Rebased on latest drm-nightly. Fixed Jani's review comments.

v4: Making backlight calls generic as per Jani's suggestion.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/intel_dsi.c |   20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 08bade2..3e7f796 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -438,6 +438,7 @@ 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");
@@ -458,6 +459,9 @@ static void intel_dsi_enable(struct intel_encoder *encoder)
 
 		intel_dsi_port_enable(encoder);
 	}
+
+	msleep(intel_dsi->backlight_on_delay);
+	intel_panel_enable_backlight(intel_connector);
 }
 
 static void intel_dsi_pre_enable(struct intel_encoder *encoder)
@@ -623,10 +627,14 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder)
 {
 	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");
 
+	intel_panel_disable_backlight(intel_connector);
+	msleep(intel_dsi->backlight_off_delay);
+
 	intel_dsi_disable(encoder);
 
 	intel_dsi_clear_device_ready(encoder);
@@ -1226,8 +1234,18 @@ void intel_dsi_init(struct drm_device *dev)
 
 	intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
 
-	return;
+	/*
+	 * Pipe parameter is not used for BXT.
+	 * Passing INVALID_PIPE to adher to API requirement.
+	 */
+	if (IS_BROXTON(dev))
+		intel_panel_setup_backlight(connector, INVALID_PIPE);
+	else
+		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