drm/nouveau: Add module options to disable acceleration.

noaccel=1 disables all acceleration and doesn't even attempt
initialising PGRAPH+PFIFO, nofbaccel=1 only makes fbcon unaccelerated.

Signed-off-by: Marcin Kościelnicki <koriakin@0x04.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

4 files changed, 37 insertions, 15 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.c b/drivers/gpu/drm/nouveau/nouveau_drv.c
index fc692e5553ad..da3b93b84502 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.c
@@ -75,6 +75,14 @@ MODULE_PARM_DESC(ignorelid, "Ignore ACPI lid status");
 int nouveau_ignorelid = 0;
 module_param_named(ignorelid, nouveau_ignorelid, int, 0400);
 
+MODULE_PARM_DESC(noagp, "Disable all acceleration");
+int nouveau_noaccel = 0;
+module_param_named(noaccel, nouveau_noaccel, int, 0400);
+
+MODULE_PARM_DESC(noagp, "Disable fbcon acceleration");
+int nouveau_nofbaccel = 0;
+module_param_named(nofbaccel, nouveau_nofbaccel, int, 0400);
+
 MODULE_PARM_DESC(tv_norm, "Default TV norm.\n"
                  "\t\tSupported: PAL, PAL-M, PAL-N, PAL-Nc, NTSC-M, NTSC-J,\n"
                  "\t\t\thd480i, hd480p, hd576i, hd576p, hd720p, hd1080i.\n"
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 6b9690418bc7..5445cefdd03e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -678,6 +678,8 @@ extern int nouveau_reg_debug;
 extern char *nouveau_vbios;
 extern int nouveau_ctxfw;
 extern int nouveau_ignorelid;
+extern int nouveau_nofbaccel;
+extern int nouveau_noaccel;
 
 /* nouveau_state.c */
 extern void nouveau_preclose(struct drm_device *dev, struct drm_file *);
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 0b05c869e0e7..eddadaccc285 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -267,8 +267,12 @@ nouveau_fbcon_create(struct drm_device *dev, uint32_t fb_width,
         dev_priv->fbdev_info = info;
 
         strcpy(info->fix.id, "nouveaufb");
-        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA |
-                      FBINFO_HWACCEL_FILLRECT | FBINFO_HWACCEL_IMAGEBLIT;
+        if (nouveau_nofbaccel)
+                info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_DISABLED;
+        else
+                info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA |
+                              FBINFO_HWACCEL_FILLRECT |
+                              FBINFO_HWACCEL_IMAGEBLIT;
         info->fbops = &nouveau_fbcon_ops;
         info->fix.smem_start = dev->mode_config.fb_base + nvbo->bo.offset -
                                dev_priv->vm_vram_base;
@@ -316,7 +320,7 @@ nouveau_fbcon_create(struct drm_device *dev, uint32_t fb_width,
         par->nouveau_fb = nouveau_fb;
         par->dev = dev;
 
-        if (dev_priv->channel) {
+        if (dev_priv->channel && !nouveau_nofbaccel) {
                 switch (dev_priv->card_type) {
                 case NV_50:
                         nv50_fbcon_accel_init(info);
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index f2d0187ba152..241e24d60eb4 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -427,15 +427,19 @@ nouveau_card_init(struct drm_device *dev)
         if (ret)
                 goto out_timer;
 
-        /* PGRAPH */
-        ret = engine->graph.init(dev);
-        if (ret)
-                goto out_fb;
+        if (nouveau_noaccel)
+                engine->graph.accel_blocked = true;
+        else {
+                /* PGRAPH */
+                ret = engine->graph.init(dev);
+                if (ret)
+                        goto out_fb;
 
-        /* PFIFO */
-        ret = engine->fifo.init(dev);
-        if (ret)
-                goto out_graph;
+                /* PFIFO */
+                ret = engine->fifo.init(dev);
+                if (ret)
+                        goto out_graph;
+        }
 
         /* this call irq_preinstall, register irq handler and
          * call irq_postinstall
@@ -479,9 +483,11 @@ nouveau_card_init(struct drm_device *dev)
 out_irq:
         drm_irq_uninstall(dev);
 out_fifo:
-        engine->fifo.takedown(dev);
+        if (!nouveau_noaccel)
+                engine->fifo.takedown(dev);
 out_graph:
-        engine->graph.takedown(dev);
+        if (!nouveau_noaccel)
+                engine->graph.takedown(dev);
 out_fb:
         engine->fb.takedown(dev);
 out_timer:
@@ -518,8 +524,10 @@ static void nouveau_card_takedown(struct drm_device *dev)
                         dev_priv->channel = NULL;
                 }
 
-                engine->fifo.takedown(dev);
-                engine->graph.takedown(dev);
+                if (!nouveau_noaccel) {
+                        engine->fifo.takedown(dev);
+                        engine->graph.takedown(dev);
+                }
                 engine->fb.takedown(dev);
                 engine->timer.takedown(dev);
                 engine->mc.takedown(dev);