From: Ben Skeggs <bskeggs@redhat.com>
Date: Tue, 8 May 2018 10:39:47 +0000 (+1000)
Subject: drm/nouveau/kms/nv50-: determine MST support from DP Info Table
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=34508f9d260cbd7b91f988c858f50ad956750ee3;p=openwrt%2Fstaging%2Fblogic.git

drm/nouveau/kms/nv50-: determine MST support from DP Info Table

GV100 doesn't support MST, use the information provided in VBIOS tables to
detect its presence instead.

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

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 006562f7f23e..eaa63b43282b 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -52,6 +52,8 @@
 #include "nouveau_fence.h"
 #include "nouveau_fbcon.h"
 
+#include <subdev/bios/dp.h>
+
 /******************************************************************************
  * Atomic state
  *****************************************************************************/
@@ -1383,9 +1385,12 @@ nv50_sor_create(struct drm_connector *connector, struct dcb_output *dcbe)
 {
 	struct nouveau_connector *nv_connector = nouveau_connector(connector);
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
+	struct nvkm_bios *bios = nvxx_bios(&drm->client.device);
 	struct nvkm_i2c *i2c = nvxx_i2c(&drm->client.device);
 	struct nouveau_encoder *nv_encoder;
 	struct drm_encoder *encoder;
+	u8 ver, hdr, cnt, len;
+	u32 data;
 	int type, ret;
 
 	switch (dcbe->type) {
@@ -1429,8 +1434,8 @@ nv50_sor_create(struct drm_connector *connector, struct dcb_output *dcbe)
 			nv_encoder->aux = aux;
 		}
 
-		/*TODO: Use DP Info Table to check for support. */
-		if (disp->disp->object.oclass >= GF110_DISP) {
+		if ((data = nvbios_dp_table(bios, &ver, &hdr, &cnt, &len)) &&
+		    ver >= 0x40 && (nvbios_rd08(bios, data + 0x08) & 0x04)) {
 			ret = nv50_mstm_new(nv_encoder, &nv_connector->aux, 16,
 					    nv_connector->base.base.id,
 					    &nv_encoder->dp.mstm);
diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/dp.h b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/dp.h
index df34b41838d6..512e25a41803 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/dp.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/dp.h
@@ -1,6 +1,10 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __NVBIOS_DP_H__
 #define __NVBIOS_DP_H__
+
+u16
+nvbios_dp_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len);
+
 struct nvbios_dpout {
 	u16 type;
 	u16 mask;
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dp.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dp.c
index 7c7efa4ea0d0..3133b28f849c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dp.c
@@ -25,7 +25,7 @@
 #include <subdev/bios/bit.h>
 #include <subdev/bios/dp.h>
 
-static u16
+u16
 nvbios_dp_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
 {
 	struct bit_entry d;