drm/nvd0-/disp: handle case where display engine is missing/disabled

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

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
index 3ed10b0..52dd7a1 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
@@ -958,6 +958,9 @@ nvd0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
        int heads = nv_rd32(parent, 0x022448);
        int ret;
 
+       if (nv_rd32(parent, 0x022500) & 0x00000001)
+               return -ENODEV;
+
        ret = nouveau_disp_create(parent, engine, oclass, heads,
                                  "PDISP", "display", &priv);
        *pobject = nv_object(priv);

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c
index 20725b3..fb1fe6a 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nve0.c
@@ -54,6 +54,9 @@ nve0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
        int heads = nv_rd32(parent, 0x022448);
        int ret;
 
+       if (nv_rd32(parent, 0x022500) & 0x00000001)
+               return -ENODEV;
+
        ret = nouveau_disp_create(parent, engine, oclass, heads,
                                  "PDISP", "display", &priv);
        *pobject = nv_object(priv);

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nvf0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nvf0.c
index a488c36..42aa6b9 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nvf0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nvf0.c
@@ -54,6 +54,9 @@ nvf0_disp_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
        int heads = nv_rd32(parent, 0x022448);
        int ret;
 
+       if (nv_rd32(parent, 0x022500) & 0x00000001)
+               return -ENODEV;
+
        ret = nouveau_disp_create(parent, engine, oclass, heads,
                                  "PDISP", "display", &priv);
        *pobject = nv_object(priv);

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
index 0e2c1a4..aa0fbbe 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
@@ -85,11 +85,15 @@ static void
 nouveau_bios_shadow_pramin(struct nouveau_bios *bios)
 {
        struct nouveau_device *device = nv_device(bios);
+       u64 addr = 0;
        u32 bar0 = 0;
        int i;
 
        if (device->card_type >= NV_50) {
-               u64 addr = (u64)(nv_rd32(bios, 0x619f04) & 0xffffff00) << 8;
+               if (  device->card_type < NV_C0 ||
+                   !(nv_rd32(bios, 0x022500) & 0x00000001))
+                       addr = (u64)(nv_rd32(bios, 0x619f04) & 0xffffff00) << 8;
+
                if (!addr) {
                        addr  = (u64)nv_rd32(bios, 0x001700) << 16;
                        addr += 0xf0000;

diff --git a/drivers/gpu/drm/nouveau/core/subdev/devinit/nvc0.c b/drivers/gpu/drm/nouveau/core/subdev/devinit/nvc0.c
index dd78efb..af407a8 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/devinit/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/devinit/nvc0.c
@@ -73,6 +73,8 @@ nvc0_devinit_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
                return ret;
 
        priv->base.pll_set = nvc0_devinit_pll_set;
+       if (nv_rd32(priv, 0x022500) & 0x00000001)
+               priv->base.post = true;
        return 0;
 }
 

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index e09817d..3e72876 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -2051,19 +2051,14 @@ nouveau_bios_posted(struct drm_device *dev)
        struct nouveau_drm *drm = nouveau_drm(dev);
        unsigned htotal;
 
-       if (nv_device(drm->device)->card_type >= NV_50) {
-               if (NVReadVgaCrtc(dev, 0, 0x00) == 0 &&
-                   NVReadVgaCrtc(dev, 0, 0x1a) == 0)
-                       return false;
+       if (nv_device(drm->device)->card_type >= NV_50)
                return true;
-       }
 
        htotal  = NVReadVgaCrtc(dev, 0, 0x06);
        htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x01) << 8;
        htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x20) << 4;
        htotal |= (NVReadVgaCrtc(dev, 0, 0x25) & 0x01) << 10;
        htotal |= (NVReadVgaCrtc(dev, 0, 0x41) & 0x01) << 11;
-
        return (htotal != 0);
 }