Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...

[mirror_ubuntu-zesty-kernel.git] / drivers / gpu / drm / radeon / radeon_bios.c

diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 96e37a6e7ce4d7e28c85a3e42a0445d57f7120ef..34a9b9119518273c97cb1df5e1b966709a838c7b 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -33,12 +33,50 @@
 /*
  * BIOS.
  */
+
+/* If you boot an IGP board with a discrete card as the primary,
+ * the IGP rom is not accessible via the rom bar as the IGP rom is
+ * part of the system bios.  On boot, the system bios puts a
+ * copy of the igp rom at the start of vram if a discrete card is
+ * present.
+ */
+static bool igp_read_bios_from_vram(struct radeon_device *rdev)
+{
+       uint8_t __iomem *bios;
+       resource_size_t vram_base;
+       resource_size_t size = 256 * 1024; /* ??? */
+
+       rdev->bios = NULL;
+       vram_base = drm_get_resource_start(rdev->ddev, 0);
+       bios = ioremap(vram_base, size);
+       if (!bios) {
+               DRM_ERROR("Unable to mmap vram\n");
+               return false;
+       }
+
+       if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
+               iounmap(bios);
+               DRM_ERROR("bad rom signature\n");
+               return false;
+       }
+       rdev->bios = kmalloc(size, GFP_KERNEL);
+       if (rdev->bios == NULL) {
+               iounmap(bios);
+               DRM_ERROR("kmalloc failed\n");
+               return false;
+       }
+       memcpy(rdev->bios, bios, size);
+       iounmap(bios);
+       return true;
+}
+
 static bool radeon_read_bios(struct radeon_device *rdev)
 {
        uint8_t __iomem *bios;
        size_t size;
 
        rdev->bios = NULL;
+       /* XXX: some cards may return 0 for rom size? ddx has a workaround */
        bios = pci_map_rom(rdev->pdev, &size);
        if (!bios) {
                return false;
@@ -341,7 +379,9 @@ static bool legacy_read_disabled_bios(struct radeon_device *rdev)
 
 static bool radeon_read_disabled_bios(struct radeon_device *rdev)
 {
-       if (rdev->family >= CHIP_RV770)
+       if (rdev->flags & RADEON_IS_IGP)
+               return igp_read_bios_from_vram(rdev);
+       else if (rdev->family >= CHIP_RV770)
                return r700_read_disabled_bios(rdev);
        else if (rdev->family >= CHIP_R600)
                return r600_read_disabled_bios(rdev);
@@ -356,7 +396,12 @@ bool radeon_get_bios(struct radeon_device *rdev)
        bool r;
        uint16_t tmp;
 
-       r = radeon_read_bios(rdev);
+       if (rdev->flags & RADEON_IS_IGP) {
+               r = igp_read_bios_from_vram(rdev);
+               if (r == false)
+                       r = radeon_read_bios(rdev);
+       } else
+               r = radeon_read_bios(rdev);
        if (r == false) {
                r = radeon_read_disabled_bios(rdev);
        }