drm/nouveau/disp/sor/gf119-: add method to control mst enable

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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

@@ -34,6 +34,7 @@ struct nv50_disp_mthd_v1 {
 #define NV50_DISP_MTHD_V1_SOR_HDMI_PWR                                     0x22
 #define NV50_DISP_MTHD_V1_SOR_LVDS_SCRIPT                                  0x23
 #define NV50_DISP_MTHD_V1_SOR_DP_PWR                                       0x24
+#define NV50_DISP_MTHD_V1_SOR_DP_MST_LINK                                  0x25
 #define NV50_DISP_MTHD_V1_PIOR_PWR                                         0x30
 	__u8  method;
 	__u16 hasht;
@@ -90,6 +91,12 @@ struct nv50_disp_sor_dp_pwr_v0 {
 	__u8  pad02[6];
 };
 
+struct nv50_disp_sor_dp_mst_link_v0 {
+	__u8  version;
+	__u8  state;
+	__u8  pad02[6];
+};
+
 struct nv50_disp_pior_pwr_v0 {
 	__u8  version;
 	__u8  state;

drivers/gpu/drm/nouveau/nvkm/engine/disp/gf119.c

@@ -203,17 +203,19 @@ gf119_disp_intr_unk2_0(struct nv50_disp *disp, int head)
 	/* see note in nv50_disp_intr_unk20_0() */
 	if (outp && outp->info.type == DCB_OUTPUT_DP) {
 		struct nvkm_output_dp *outpdp = nvkm_output_dp(outp);
-		struct nvbios_init init = {
-			.subdev = subdev,
-			.bios = subdev->device->bios,
-			.outp = &outp->info,
-			.crtc = head,
-			.offset = outpdp->info.script[4],
-			.execute = 1,
-		};
+		if (!outpdp->lt.mst) {
+			struct nvbios_init init = {
+				.subdev = subdev,
+				.bios = subdev->device->bios,
+				.outp = &outp->info,
+				.crtc = head,
+				.offset = outpdp->info.script[4],
+				.execute = 1,
+			};
 
-		nvbios_exec(&init);
-		atomic_set(&outpdp->lt.done, 0);
+			nvbios_exec(&init);
+			atomic_set(&outpdp->lt.done, 0);
+		}
 	}
 }
 

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

@@ -32,6 +32,7 @@ struct nvkm_output_dp {
 	struct mutex mutex;
 	struct {
 		atomic_t done;
+		bool mst;
 	} lt;
 };
 

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

@@ -180,6 +180,26 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 			return ret;
 	}
 		break;
+	case NV50_DISP_MTHD_V1_SOR_DP_MST_LINK: {
+		struct nvkm_output_dp *outpdp = nvkm_output_dp(outp);
+		union {
+			struct nv50_disp_sor_dp_mst_link_v0 v0;
+		} *args = data;
+		int ret = -ENOSYS;
+		nvif_ioctl(object, "disp sor dp mst link size %d\n", size);
+		if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
+			nvif_ioctl(object, "disp sor dp mst link vers %d state %d\n",
+				   args->v0.version, args->v0.state);
+			if (outpdp->lt.mst != !!args->v0.state) {
+				outpdp->lt.mst = !!args->v0.state;
+				atomic_set(&outpdp->lt.done, 0);
+				nvkm_output_dp_train(&outpdp->base, 0);
+			}
+			return 0;
+		} else
+			return ret;
+	}
+		break;
 	case NV50_DISP_MTHD_V1_PIOR_PWR:
 		if (!func->pior.power)
 			return -ENODEV;

drivers/gpu/drm/nouveau/nvkm/engine/disp/sorgf119.c

@@ -56,11 +56,13 @@ gf119_sor_dp_lnk_ctl(struct nvkm_output_dp *outp, int nr, int bw, bool ef)
 
 	clksor |= bw << 18;
 	dpctrl |= ((1 << nr) - 1) << 16;
+	if (outp->lt.mst)
+		dpctrl |= 0x40000000;
 	if (ef)
 		dpctrl |= 0x00004000;
 
 	nvkm_mask(device, 0x612300 + soff, 0x007c0000, clksor);
-	nvkm_mask(device, 0x61c10c + loff, 0x001f4000, dpctrl);
+	nvkm_mask(device, 0x61c10c + loff, 0x401f4000, dpctrl);
 	return 0;
 }