drm/i915: Store dbuf slice mask in device info

Let's just store the dbuf slice information as a bitmask
in the device info. Makes life a little easier later.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210416171011.19012-4-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_display_power.c

@@ -4777,7 +4777,7 @@ static void gen9_dbuf_slice_set(struct drm_i915_private *dev_priv,
 void gen9_dbuf_slices_update(struct drm_i915_private *dev_priv,
 			     u8 req_slices)
 {
-	int num_slices = INTEL_INFO(dev_priv)->dbuf.num_slices;
+	int num_slices = intel_dbuf_num_slices(dev_priv);
 	struct i915_power_domains *power_domains = &dev_priv->power_domains;
 	enum dbuf_slice slice;
 
@@ -4825,7 +4825,7 @@ static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
 
 static void gen12_dbuf_slices_config(struct drm_i915_private *dev_priv)
 {
-	int num_slices = INTEL_INFO(dev_priv)->dbuf.num_slices;
+	int num_slices = intel_dbuf_num_slices(dev_priv);
 	enum dbuf_slice slice;
 
 	for (slice = DBUF_S1; slice < (DBUF_S1 + num_slices); slice++)

drivers/gpu/drm/i915/i915_pci.c

@@ -648,7 +648,7 @@ static const struct intel_device_info chv_info = {
 	.display.has_hdcp = 1, \
 	.display.has_ipc = 1, \
 	.dbuf.size = 896 - 4, /* 4 blocks for bypass path allocation */ \
-	.dbuf.num_slices = 1
+	.dbuf.slice_mask = BIT(DBUF_S1)
 
 #define SKL_PLATFORM \
 	GEN9_FEATURES, \
@@ -683,7 +683,7 @@ static const struct intel_device_info skl_gt4_info = {
 #define GEN9_LP_FEATURES \
 	GEN(9), \
 	.is_lp = 1, \
-	.dbuf.num_slices = 1, \
+	.dbuf.slice_mask = BIT(DBUF_S1), \
 	.display.has_hotplug = 1, \
 	.platform_engine_mask = BIT(RCS0) | BIT(VCS0) | BIT(BCS0) | BIT(VECS0), \
 	.pipe_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C), \
@@ -831,7 +831,7 @@ static const struct intel_device_info cnl_info = {
 	}, \
 	GEN(11), \
 	.dbuf.size = 2048, \
-	.dbuf.num_slices = 2, \
+	.dbuf.slice_mask = BIT(DBUF_S1) | BIT(DBUF_S2), \
 	.has_logical_ring_elsq = 1, \
 	.color = { .degamma_lut_size = 33, .gamma_lut_size = 262145 }
 

drivers/gpu/drm/i915/intel_device_info.h

@@ -198,7 +198,7 @@ struct intel_device_info {
 
 	struct {
 		u16 size; /* in blocks */
-		u8 num_slices;
+		u8 slice_mask;
 	} dbuf;
 
 	/* Register offsets for the various display pipes and transcoders */

drivers/gpu/drm/i915/intel_pm.c

@@ -3637,7 +3637,7 @@ bool ilk_disable_lp_wm(struct drm_i915_private *dev_priv)
 u8 intel_enabled_dbuf_slices_mask(struct drm_i915_private *dev_priv)
 {
 	int i;
-	int num_slices = INTEL_INFO(dev_priv)->dbuf.num_slices;
+	int num_slices = intel_dbuf_num_slices(dev_priv);
 	u8 enabled_slices_mask = 0;
 
 	for (i = 0; i < num_slices; i++) {
@@ -4033,10 +4033,15 @@ static int intel_dbuf_size(struct drm_i915_private *dev_priv)
 	return INTEL_INFO(dev_priv)->dbuf.size;
 }
 
+int intel_dbuf_num_slices(struct drm_i915_private *dev_priv)
+{
+	return hweight8(INTEL_INFO(dev_priv)->dbuf.slice_mask);
+}
+
 static int intel_dbuf_slice_size(struct drm_i915_private *dev_priv)
 {
 	return intel_dbuf_size(dev_priv) /
-		INTEL_INFO(dev_priv)->dbuf.num_slices;
+		intel_dbuf_num_slices(dev_priv);
 }
 
 static void
@@ -4063,7 +4068,7 @@ u32 skl_ddb_dbuf_slice_mask(struct drm_i915_private *dev_priv,
 {
 	u32 slice_mask = 0;
 	u16 ddb_size = intel_dbuf_size(dev_priv);
-	int num_slices = INTEL_INFO(dev_priv)->dbuf.num_slices;
+	int num_slices = intel_dbuf_num_slices(dev_priv);
 	u16 slice_size = ddb_size / num_slices;
 	u16 start_slice;
 	u16 end_slice;
@@ -5821,7 +5826,7 @@ skl_compute_ddb(struct intel_atomic_state *state)
 			    "Enabled dbuf slices 0x%x -> 0x%x (out of %d dbuf slices)\n",
 			    old_dbuf_state->enabled_slices,
 			    new_dbuf_state->enabled_slices,
-			    INTEL_INFO(dev_priv)->dbuf.num_slices);
+			    intel_dbuf_num_slices(dev_priv));
 	}
 
 	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {

drivers/gpu/drm/i915/intel_pm.h

@@ -38,6 +38,7 @@ void vlv_wm_get_hw_state(struct drm_i915_private *dev_priv);
 void ilk_wm_get_hw_state(struct drm_i915_private *dev_priv);
 void skl_wm_get_hw_state(struct drm_i915_private *dev_priv);
 u8 intel_enabled_dbuf_slices_mask(struct drm_i915_private *dev_priv);
+int intel_dbuf_num_slices(struct drm_i915_private *dev_priv);
 void skl_pipe_ddb_get_hw_state(struct intel_crtc *crtc,
 			       struct skl_ddb_entry *ddb_y,
 			       struct skl_ddb_entry *ddb_uv);