[PATCH 8/9] drm/i915/skl: Support blend color on primary

[Vandita Kulkarni <vandita.kulkarni@intel.com>]

From: vandita kulkarni <vandita.kulkarni@intel.com>

Set the global alpha value for primary plane in
the PLANE_KEYMAX register, to enable which set
plane alpha enable bit in the PLANE_KEYMSK
register. On bxt only 8 bit alpha will be
considered from the PLANE_KEYMAX register.

Signed-off-by: vandita kulkarni <vandita.kulkarni@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      |  4 ++++
 drivers/gpu/drm/i915/intel_display.c | 11 +++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0a98889..cc14f75 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5483,6 +5483,10 @@ enum skl_disp_power_wells {
 #define PLANE_KEYMAX(pipe, plane)	\
 	_MMIO_PLANE(plane, _PLANE_KEYMAX_1(pipe), _PLANE_KEYMAX_2(pipe))
 
+#define PLANE_KEYMAX_ALPHA_MASK			0x00ffffff
+#define PLANE_KEY_MASK_ALPHA_EN			31
+#define PLANE_KEY_MAX_ALPHA_SHIFT		24
+
 #define _PLANE_BUF_CFG_1_B			0x7127c
 #define _PLANE_BUF_CFG_2_B			0x7137c
 #define _PLANE_BUF_CFG_1(pipe)	\
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a2cc63e..61d8562 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3107,6 +3107,8 @@ static void skylake_update_primary_plane(struct drm_plane *plane,
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
 	struct drm_framebuffer *fb = plane_state->base.fb;
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	const struct drm_intel_sprite_colorkey *key =
+		&to_intel_plane_state(plane->state)->ckey;
 	int pipe = intel_crtc->pipe;
 	u32 plane_ctl, stride_div, stride;
 	u32 tile_height, plane_offset, plane_size;
@@ -3141,6 +3143,15 @@ static void skylake_update_primary_plane(struct drm_plane *plane,
 
 	WARN_ON(drm_rect_width(&plane_state->src) == 0);
 
+	I915_WRITE(PLANE_KEYMAX(pipe, 0), (DRM_MODE_COLOR_ALPHA_8
+			(plane_state->base.blend_mode.color)
+				<< PLANE_KEY_MAX_ALPHA_SHIFT) |
+			(key->max_value & PLANE_KEYMAX_ALPHA_MASK));
+	I915_WRITE(PLANE_KEYMSK(pipe, 0),
+			(plane_state->use_plane_alpha
+				<< PLANE_KEY_MASK_ALPHA_EN) |
+			(key->channel_mask & GENMASK(0, 26)));
+
 	if (intel_rotation_90_or_270(rotation)) {
 		/* stride = Surface height in tiles */
 		tile_height = intel_tile_height(dev, fb->pixel_format,
-- 
1.9.1

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