drm/nouveau/bios: allow loading alternate vbios image as firmware

Useful for debugging different VBIOS versions.

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

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index 0be4a815e706..524f283263a9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -30,6 +30,7 @@
 #include "nouveau_gpio.h"
 
 #include <linux/io-mapping.h>
+#include <linux/firmware.h>
 
 /* these defines are made up */
 #define NV_CIO_CRE_44_HEADA 0x0
@@ -249,8 +250,12 @@ bios_shadow(struct drm_device *dev)
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         struct nvbios *bios = &dev_priv->vbios;
         struct methods *mthd, *best;
+        const struct firmware *fw;
+        char fname[32];
+        int ret;
 
         if (nouveau_vbios) {
+                /* try to match one of the built-in methods */
                 mthd = shadow_methods;
                 do {
                         if (strcasecmp(nouveau_vbios, mthd->desc))
@@ -263,6 +268,22 @@ bios_shadow(struct drm_device *dev)
                                 return true;
                 } while ((++mthd)->shadow);
 
+                /* attempt to load firmware image */
+                snprintf(fname, sizeof(fname), "nouveau/%s", nouveau_vbios);
+                ret = request_firmware(&fw, fname, &dev->pdev->dev);
+                if (ret == 0) {
+                        bios->length = fw->size;
+                        bios->data   = kmemdup(fw->data, fw->size, GFP_KERNEL);
+                        release_firmware(fw);
+
+                        NV_INFO(dev, "VBIOS image: %s\n", nouveau_vbios);
+                        if (score_vbios(bios, 1))
+                                return true;
+
+                        kfree(bios->data);
+                        bios->data = NULL;
+                }
+
                 NV_ERROR(dev, "VBIOS source \'%s\' invalid\n", nouveau_vbios);
         }