drm/nouveau/kms/nv50-: allow more flexibility with lut formats

Will be required for Turing.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/dispnv50/atom.h

@@ -57,6 +57,7 @@ struct nv50_head_atom {
 		u8 size:2;
 		u8 range:2;
 		u8 output_mode:2;
+		void (*load)(struct drm_color_lut *, int size, void __iomem *);
 	} olut;
 
 	struct {
@@ -172,6 +173,8 @@ struct nv50_wndw_atom {
 			u8  size:2;
 			u8  range:2;
 			u8  output_mode:2;
+			void (*load)(struct drm_color_lut *, int size,
+				     void __iomem *);
 		} i;
 	} xlut;
 

drivers/gpu/drm/nouveau/dispnv50/base907c.c

@@ -80,6 +80,7 @@ base907c_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
 {
 	asyw->xlut.i.mode = 7;
 	asyw->xlut.i.enable = 2;
+	asyw->xlut.i.load = head907d_olut_load;
 }
 
 const struct nv50_wndw_func

drivers/gpu/drm/nouveau/dispnv50/disp.h

@@ -45,6 +45,8 @@ struct nv50_disp_interlock {
 
 void corec37d_ntfy_init(struct nouveau_bo *, u32);
 
+void head907d_olut_load(struct drm_color_lut *, int size, void __iomem *);
+
 struct nv50_chan {
 	struct nvif_object user;
 	struct nvif_device *device;

drivers/gpu/drm/nouveau/dispnv50/head.c

@@ -50,9 +50,9 @@ nv50_head_flush_set(struct nv50_head *head, struct nv50_head_atom *asyh)
 	if (asyh->set.core   ) head->func->core_set(head, asyh);
 	if (asyh->set.olut   ) {
 		asyh->olut.offset = nv50_lut_load(&head->olut,
-						  asyh->olut.mode <= 1,
 						  asyh->olut.buffer,
-						  asyh->state.gamma_lut);
+						  asyh->state.gamma_lut,
+						  asyh->olut.load);
 		head->func->olut_set(head, asyh);
 	}
 	if (asyh->set.curs   ) head->func->curs_set(head, asyh);
@@ -210,7 +210,7 @@ nv50_head_atomic_check_lut(struct nv50_head *head,
 		}
 	}
 
-	if (!olut) {
+	if (!olut && !head->func->olut_identity) {
 		asyh->olut.handle = 0;
 		return 0;
 	}

drivers/gpu/drm/nouveau/dispnv50/head.h

@@ -21,6 +21,7 @@ struct nv50_head_func {
 	void (*view)(struct nv50_head *, struct nv50_head_atom *);
 	void (*mode)(struct nv50_head *, struct nv50_head_atom *);
 	void (*olut)(struct nv50_head *, struct nv50_head_atom *);
+	bool olut_identity;
 	void (*olut_set)(struct nv50_head *, struct nv50_head_atom *);
 	void (*olut_clr)(struct nv50_head *);
 	void (*core_calc)(struct nv50_head *, struct nv50_head_atom *);

drivers/gpu/drm/nouveau/dispnv50/head507d.c

@@ -254,6 +254,23 @@ head507d_olut_set(struct nv50_head *head, struct nv50_head_atom *asyh)
 	}
 }
 
+static void
+head507d_olut_load(struct drm_color_lut *in, int size, void __iomem *mem)
+{
+	for (; size--; in++, mem += 8) {
+		writew(drm_color_lut_extract(in->  red, 11) << 3, mem + 0);
+		writew(drm_color_lut_extract(in->green, 11) << 3, mem + 2);
+		writew(drm_color_lut_extract(in-> blue, 11) << 3, mem + 4);
+	}
+
+	/* INTERPOLATE modes require a "next" entry to interpolate with,
+	 * so we replicate the last entry to deal with this for now.
+	 */
+	writew(readw(mem - 8), mem + 0);
+	writew(readw(mem - 6), mem + 2);
+	writew(readw(mem - 4), mem + 4);
+}
+
 void
 head507d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
 {
@@ -261,6 +278,8 @@ head507d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
 		asyh->olut.mode = 0;
 	else
 		asyh->olut.mode = 1;
+
+	asyh->olut.load = head507d_olut_load;
 }
 
 void

drivers/gpu/drm/nouveau/dispnv50/head907d.c

@@ -213,10 +213,28 @@ head907d_olut_set(struct nv50_head *head, struct nv50_head_atom *asyh)
 	}
 }
 
+void
+head907d_olut_load(struct drm_color_lut *in, int size, void __iomem *mem)
+{
+	for (; size--; in++, mem += 8) {
+		writew(drm_color_lut_extract(in->  red, 14) + 0x6000, mem + 0);
+		writew(drm_color_lut_extract(in->green, 14) + 0x6000, mem + 2);
+		writew(drm_color_lut_extract(in-> blue, 14) + 0x6000, mem + 4);
+	}
+
+	/* INTERPOLATE modes require a "next" entry to interpolate with,
+	 * so we replicate the last entry to deal with this for now.
+	 */
+	writew(readw(mem - 8), mem + 0);
+	writew(readw(mem - 6), mem + 2);
+	writew(readw(mem - 4), mem + 4);
+}
+
 void
 head907d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
 {
 	asyh->olut.mode = 7;
+	asyh->olut.load = head907d_olut_load;
 }
 
 void

drivers/gpu/drm/nouveau/dispnv50/headc37d.c

@@ -155,6 +155,7 @@ headc37d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
 	asyh->olut.size = 0;
 	asyh->olut.range = 0;
 	asyh->olut.output_mode = 1;
+	asyh->olut.load = head907d_olut_load;
 }
 
 static void

drivers/gpu/drm/nouveau/dispnv50/lut.c

@@ -29,45 +29,29 @@
 #include <nvif/class.h>
 
 u32
-nv50_lut_load(struct nv50_lut *lut, bool legacy, int buffer,
-	      struct drm_property_blob *blob)
+nv50_lut_load(struct nv50_lut *lut, int buffer, struct drm_property_blob *blob,
+	      void (*load)(struct drm_color_lut *, int, void __iomem *))
 {
-	struct drm_color_lut *in = (struct drm_color_lut *)blob->data;
+	struct drm_color_lut *in = blob ? blob->data : NULL;
 	void __iomem *mem = lut->mem[buffer].object.map.ptr;
-	const int size = blob->length / sizeof(*in);
-	int bits, shift, i;
-	u16 zero, r, g, b;
-	u32 addr = lut->mem[buffer].addr;
-
-	/* This can't happen.. But it shuts the compiler up. */
-	if (WARN_ON(size != 256))
-		return 0;
+	const u32 addr = lut->mem[buffer].addr;
+	int i;
 
-	if (legacy) {
-		bits = 11;
-		shift = 3;
-		zero = 0x0000;
+	if (!in) {
+		in = kvmalloc_array(1024, sizeof(*in), GFP_KERNEL);
+		if (!WARN_ON(!in)) {
+			for (i = 0; i < 1024; i++) {
+				in[i].red   =
+				in[i].green =
+				in[i].blue  = (i << 16) >> 10;
+			}
+			load(in, 1024, mem);
+			kvfree(in);
+		}
 	} else {
-		bits = 14;
-		shift = 0;
-		zero = 0x6000;
-	}
-
-	for (i = 0; i < size; i++) {
-		r = (drm_color_lut_extract(in[i].  red, bits) + zero) << shift;
-		g = (drm_color_lut_extract(in[i].green, bits) + zero) << shift;
-		b = (drm_color_lut_extract(in[i]. blue, bits) + zero) << shift;
-		writew(r, mem + (i * 0x08) + 0);
-		writew(g, mem + (i * 0x08) + 2);
-		writew(b, mem + (i * 0x08) + 4);
+		load(in, blob->length / sizeof(*in), mem);
 	}
 
-	/* INTERPOLATE modes require a "next" entry to interpolate with,
-	 * so we replicate the last entry to deal with this for now.
-	 */
-	writew(r, mem + (i * 0x08) + 0);
-	writew(g, mem + (i * 0x08) + 2);
-	writew(b, mem + (i * 0x08) + 4);
 	return addr;
 }
 

drivers/gpu/drm/nouveau/dispnv50/lut.h

@@ -2,6 +2,7 @@
 #define __NV50_KMS_LUT_H__
 #include <nvif/mem.h>
 struct drm_property_blob;
+struct drm_color_lut;
 struct nv50_disp;
 
 struct nv50_lut {
@@ -10,6 +11,6 @@ struct nv50_lut {
 
 int nv50_lut_init(struct nv50_disp *, struct nvif_mmu *, struct nv50_lut *);
 void nv50_lut_fini(struct nv50_lut *);
-u32 nv50_lut_load(struct nv50_lut *, bool legacy, int buffer,
-		  struct drm_property_blob *);
+u32 nv50_lut_load(struct nv50_lut *, int buffer, struct drm_property_blob *,
+		  void (*)(struct drm_color_lut *, int size, void __iomem *));
 #endif

drivers/gpu/drm/nouveau/dispnv50/wndw.c

@@ -139,10 +139,8 @@ nv50_wndw_flush_set(struct nv50_wndw *wndw, u32 *interlock,
 	if (asyw->set.xlut ) {
 		if (asyw->ilut) {
 			asyw->xlut.i.offset =
-				nv50_lut_load(&wndw->ilut,
-					      asyw->xlut.i.mode <= 1,
-					      asyw->xlut.i.buffer,
-					      asyw->ilut);
+				nv50_lut_load(&wndw->ilut, asyw->xlut.i.buffer,
+					      asyw->ilut, asyw->xlut.i.load);
 		}
 		wndw->func->xlut_set(wndw, asyw);
 	}
@@ -322,6 +320,11 @@ nv50_wndw_atomic_check_lut(struct nv50_wndw *wndw,
 		asyh->wndw.olut &= ~BIT(wndw->id);
 	}
 
+	if (!ilut && wndw->func->ilut_identity) {
+		static struct drm_property_blob dummy = {};
+		ilut = &dummy;
+	}
+
 	/* Recalculate LUT state. */
 	memset(&asyw->xlut, 0x00, sizeof(asyw->xlut));
 	if ((asyw->ilut = wndw->func->ilut ? ilut : NULL)) {

drivers/gpu/drm/nouveau/dispnv50/wndw.h

@@ -65,6 +65,7 @@ struct nv50_wndw_func {
 	int (*ntfy_wait_begun)(struct nouveau_bo *, u32 offset,
 			       struct nvif_device *);
 	void (*ilut)(struct nv50_wndw *, struct nv50_wndw_atom *);
+	bool ilut_identity;
 	bool olut_core;
 	void (*xlut_set)(struct nv50_wndw *, struct nv50_wndw_atom *);
 	void (*xlut_clr)(struct nv50_wndw *);

drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c

@@ -61,6 +61,7 @@ wndwc37e_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
 	asyw->xlut.i.size = 0;
 	asyw->xlut.i.range = 0;
 	asyw->xlut.i.output_mode = 1;
+	asyw->xlut.i.load = head907d_olut_load;
 }
 
 static void