drm/nouveau: attempt to get bios from ACPI v3
Some of the laptops with the switchable graphics, seem to not post the secondary GPU at all, and we can't find a copy of the BIOS anywhere except in the ACPI rom retrieval.
This adds support for ACPI ROM retrieval to nouveau.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index e13f6af..b3f146a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -35,6 +35,7 @@
bool dsm_detected;
acpi_handle dhandle;
acpi_handle dsm_handle;
+ acpi_handle rom_handle;
} nouveau_dsm_priv;
static const char nouveau_dsm_muid[] = {
@@ -151,12 +152,13 @@
dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
if (!dhandle)
return false;
+
status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
if (ACPI_FAILURE(status)) {
return false;
}
- ret= nouveau_dsm(nvidia_handle, NOUVEAU_DSM_SUPPORTED,
+ ret = nouveau_dsm(nvidia_handle, NOUVEAU_DSM_SUPPORTED,
NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &result);
if (ret < 0)
return false;
@@ -173,6 +175,7 @@
struct pci_dev *pdev = NULL;
int has_dsm = 0;
int vga_count = 0;
+
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
@@ -204,3 +207,57 @@
{
vga_switcheroo_unregister_handler();
}
+
+/* retrieve the ROM in 4k blocks */
+static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
+ int offset, int len)
+{
+ acpi_status status;
+ union acpi_object rom_arg_elements[2], *obj;
+ struct acpi_object_list rom_arg;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
+
+ rom_arg.count = 2;
+ rom_arg.pointer = &rom_arg_elements[0];
+
+ rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
+ rom_arg_elements[0].integer.value = offset;
+
+ rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
+ rom_arg_elements[1].integer.value = len;
+
+ status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
+ return -ENODEV;
+ }
+ obj = (union acpi_object *)buffer.pointer;
+ memcpy(bios+offset, obj->buffer.pointer, len);
+ kfree(buffer.pointer);
+ return len;
+}
+
+bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
+{
+ acpi_status status;
+ acpi_handle dhandle, rom_handle;
+
+ if (!nouveau_dsm_priv.dsm_detected)
+ return false;
+
+ dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
+ if (!dhandle)
+ return false;
+
+ status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ nouveau_dsm_priv.rom_handle = rom_handle;
+ return true;
+}
+
+int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
+{
+ return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
+}