drm/nouveau/core: allow detected chipset to be overridden

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 22cd458..7c2fcab 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -631,7 +631,8 @@ static int nouveau_drm_probe(struct pci_dev *pdev,
        /* We need to check that the chipset is supported before booting
         * fbdev off the hardware, as there's no way to put it back.
         */
-       ret = nvkm_device_pci_new(pdev, NULL, "error", true, false, 0, &device);
+       ret = nvkm_device_pci_new(pdev, nouveau_config, "error",
+                                 true, false, 0, &device);
        if (ret)
                return ret;
 

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
index 7971096..159a9f8 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
@@ -2824,8 +2824,8 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
        u64 mmio_base, mmio_size;
        u32 boot0, strap;
        void __iomem *map;
-       int ret = -EEXIST;
-       int i;
+       int ret = -EEXIST, i;
+       unsigned chipset;
 
        mutex_lock(&nv_devices_mutex);
        if (nvkm_device_find_locked(handle))
@@ -2870,6 +2870,26 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
                strap = ioread32_native(map + 0x101000);
                iounmap(map);
 
+               /* chipset can be overridden for devel/testing purposes */
+               chipset = nvkm_longopt(device->cfgopt, "NvChipset", 0);
+               if (chipset) {
+                       u32 override_boot0;
+
+                       if (chipset >= 0x10) {
+                               override_boot0  = ((chipset & 0x1ff) << 20);
+                               override_boot0 |= 0x000000a1;
+                       } else {
+                               if (chipset != 0x04)
+                                       override_boot0 = 0x20104000;
+                               else
+                                       override_boot0 = 0x20004000;
+                       }
+
+                       nvdev_warn(device, "CHIPSET OVERRIDE: %08x -> %08x\n",
+                                  boot0, override_boot0);
+                       boot0 = override_boot0;
+               }
+
                /* determine chipset and derive architecture from it */
                if ((boot0 & 0x1f000000) > 0) {
                        device->chipset = (boot0 & 0x1ff00000) >> 20;