drm/i915/skl: Definition of SKL WM param structs for pipe/plane

This patch defines the structures needed for computation of
watermarks of pipes and planes for SKL.

v2: Incorporated Damien's review comments and removed unused fields
    in structs for future features like rotation, drrs and scaling.
    The skl_wm_values struct is now made more generic across planes
    and cursor planes for all pipes.

v3: implemented the plane/cursor split.

v4: Change the wm union back to a structure (Ville, Daniel)

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Pradeep Bhat <pradeep.bhat@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -1387,6 +1387,24 @@ struct ilk_wm_values {
 	enum intel_ddb_partitioning partitioning;
 };
 
+struct skl_wm_values {
+	bool dirty[I915_MAX_PIPES];
+	uint32_t wm_linetime[I915_MAX_PIPES];
+	uint32_t plane[I915_MAX_PIPES][I915_MAX_PLANES][8];
+	uint32_t cursor[I915_MAX_PIPES][8];
+	uint32_t plane_trans[I915_MAX_PIPES][I915_MAX_PLANES];
+	uint32_t cursor_trans[I915_MAX_PIPES];
+};
+
+struct skl_wm_level {
+	bool plane_en[I915_MAX_PLANES];
+	uint16_t plane_res_b[I915_MAX_PLANES];
+	uint8_t plane_res_l[I915_MAX_PLANES];
+	bool cursor_en;
+	uint16_t cursor_res_b;
+	uint8_t cursor_res_l;
+};
+
 /*
  * This struct helps tracking the state needed for runtime PM, which puts the
  * device in PCI D3 state. Notice that when this happens, nothing on the

drivers/gpu/drm/i915/intel_drv.h

@@ -412,6 +412,12 @@ struct intel_mmio_flip {
 	struct work_struct work;
 };
 
+struct skl_pipe_wm {
+	struct skl_wm_level wm[8];
+	struct skl_wm_level trans_wm;
+	uint32_t linetime;
+};
+
 struct intel_crtc {
 	struct drm_crtc base;
 	enum pipe pipe;
@@ -459,6 +465,8 @@ struct intel_crtc {
 	struct {
 		/* watermarks currently being used  */
 		struct intel_pipe_wm active;
+		/* SKL wm values currently in use */
+		struct skl_pipe_wm skl_active;
 	} wm;
 
 	int scanline_offset;

drivers/gpu/drm/i915/intel_pm.c

@@ -1960,6 +1960,14 @@ static uint32_t ilk_wm_fbc(uint32_t pri_val, uint32_t horiz_pixels,
 	return DIV_ROUND_UP(pri_val * 64, horiz_pixels * bytes_per_pixel) + 2;
 }
 
+struct skl_pipe_wm_parameters {
+	bool active;
+	uint32_t pipe_htotal;
+	uint32_t pixel_rate; /* in KHz */
+	struct intel_plane_wm_parameters plane[I915_MAX_PLANES];
+	struct intel_plane_wm_parameters cursor;
+};
+
 struct ilk_pipe_wm_parameters {
 	bool active;
 	uint32_t pipe_htotal;