drm/nouveau/disp: add a way to configure scrambling/tmds for hdmi 2.0

High pixel clocks are required to use a 40 TMDS divider instead of 10,
and even low ones may optionally use scrambling depending on device
support.
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvif/cl5070.h

@@ -69,7 +69,10 @@ struct nv50_disp_sor_hdmi_pwr_v0 {
 	__u8  rekey;
 	__u8  avi_infoframe_length;
 	__u8  vendor_infoframe_length;
-	__u8  pad06[2];
+#define NV50_DISP_SOR_HDMI_PWR_V0_SCDC_SCRAMBLE (1 << 0)
+#define NV50_DISP_SOR_HDMI_PWR_V0_SCDC_DIV_BY_4 (1 << 1)
+	__u8  scdc;
+	__u8  pad07[1];
 };
 
 struct nv50_disp_sor_lvds_script_v0 {

drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h

@@ -61,6 +61,7 @@ struct nvkm_ior_func {
 		void (*ctrl)(struct nvkm_ior *, int head, bool enable,
 			     u8 max_ac_packet, u8 rekey, u8 *avi, u8 avi_size,
 			     u8 *vendor, u8 vendor_size);
+		void (*scdc)(struct nvkm_ior *, int head, u8 scdc);
 	} hdmi;
 
 	struct {

drivers/gpu/drm/nouveau/nvkm/engine/disp/rootnv50.c

@@ -176,9 +176,10 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 		nvif_ioctl(object, "disp sor hdmi ctrl size %d\n", size);
 		if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 			nvif_ioctl(object, "disp sor hdmi ctrl vers %d state %d "
-					   "max_ac_packet %d rekey %d\n",
+					   "max_ac_packet %d rekey %d scdc %d\n",
 				   args->v0.version, args->v0.state,
-				   args->v0.max_ac_packet, args->v0.rekey);
+				   args->v0.max_ac_packet, args->v0.rekey,
+				   args->v0.scdc);
 			if (args->v0.max_ac_packet > 0x1f || args->v0.rekey > 0x7f)
 				return -EINVAL;
 			if ((args->v0.avi_infoframe_length
@@ -202,6 +203,11 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 					   args->v0.max_ac_packet,
 					   args->v0.rekey, avi, avi_size,
 					   vendor, vendor_size);
+
+		if (outp->ior->func->hdmi.scdc)
+			outp->ior->func->hdmi.scdc(
+					outp->ior, hidx, args->v0.scdc);
+
 		return 0;
 	}
 		break;