drm/gm204/disp: some magic that fixes bringup of uninitialised outputs

Probably missing something here, doesn't make a lot of sense to write
or+link data into a register whose offset is calculated by the same
or+link info..

This is the all I've witnessed the binary driver and vbios doing so
far, so it'll do.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/disp/dport.c

@@ -28,7 +28,7 @@
 #include <subdev/bios/init.h>
 #include <subdev/i2c.h>
 
-#include <engine/disp.h>
+#include "nv50.h"
 
 #include <nvif/class.h>
 
@@ -326,7 +326,7 @@ void
 nouveau_dp_train(struct work_struct *w)
 {
 	struct nvkm_output_dp *outp = container_of(w, typeof(*outp), lt.work);
-	struct nouveau_disp *disp = nouveau_disp(outp);
+	struct nv50_disp_priv *priv = (void *)nouveau_disp(outp);
 	const struct dp_rates *cfg = nouveau_dp_rates;
 	struct dp_state _dp = {
 		.outp = outp,
@@ -334,8 +334,11 @@ nouveau_dp_train(struct work_struct *w)
 	u32 datarate = 0;
 	int ret;
 
+	if (!outp->base.info.location && priv->sor.magic)
+		priv->sor.magic(&outp->base);
+
 	/* bring capabilities within encoder limits */
-	if (nv_mclass(disp) < GF110_DISP)
+	if (nv_mclass(priv) < GF110_DISP)
 		outp->dpcd[2] &= ~DPCD_RC02_TPS3_SUPPORTED;
 	if ((outp->dpcd[2] & 0x1f) > outp->base.info.dpconf.link_nr) {
 		outp->dpcd[2] &= ~DPCD_RC02_MAX_LANE_COUNT;

drivers/gpu/drm/nouveau/core/engine/disp/gm204.c

@@ -85,6 +85,7 @@ gm204_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	priv->sor.power = nv50_sor_power;
 	priv->sor.hda_eld = nvd0_hda_eld;
 	priv->sor.hdmi = nvd0_hdmi_ctrl;
+	priv->sor.magic = gm204_sor_magic;
 	return 0;
 }
 

drivers/gpu/drm/nouveau/core/engine/disp/nv50.h

@@ -42,6 +42,7 @@ struct nv50_disp_priv {
 		int (*hda_eld)(NV50_DISP_MTHD_V1);
 		int (*hdmi)(NV50_DISP_MTHD_V1);
 		u32 lvdsconf;
+		void (*magic)(struct nvkm_output *);
 	} sor;
 	struct {
 		int nr;
@@ -245,6 +246,7 @@ extern struct nvkm_output_dp_impl nvd0_sor_dp_impl;
 int nvd0_sor_dp_lnk_ctl(struct nvkm_output_dp *, int, int, bool);
 extern struct nouveau_oclass *nvd0_disp_outp_sclass[];
 
+void gm204_sor_magic(struct nvkm_output *outp);
 extern struct nvkm_output_dp_impl gm204_sor_dp_impl;
 
 #endif

drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c

@@ -1055,6 +1055,9 @@ nvd0_disp_intr_unk2_2(struct nv50_disp_priv *priv, int head)
 
 		if (nvkm_output_dp_train(outp, pclk, true))
 			ERR("link not trained before attach\n");
+	} else {
+		if (priv->sor.magic)
+			priv->sor.magic(outp);
 	}
 
 	exec_clkcmp(priv, head, 0, pclk, &conf);

drivers/gpu/drm/nouveau/core/engine/disp/sorgm204.c

@@ -44,6 +44,18 @@ gm204_sor_loff(struct nvkm_output_dp *outp)
 	return gm204_sor_soff(outp) + !(outp->base.info.sorconf.link & 1) * 0x80;
 }
 
+void
+gm204_sor_magic(struct nvkm_output *outp)
+{
+	struct nv50_disp_priv *priv = (void *)nouveau_disp(outp);
+	const u32 soff = outp->or * 0x100;
+	const u32 data = outp->or + 1;
+	if (outp->info.sorconf.link & 1)
+		nv_mask(priv, 0x612308 + soff, 0x0000001f, 0x00000000 | data);
+	if (outp->info.sorconf.link & 2)
+		nv_mask(priv, 0x612388 + soff, 0x0000001f, 0x00000010 | data);
+}
+
 static inline u32
 gm204_sor_dp_lane_map(struct nv50_disp_priv *priv, u8 lane)
 {