Commit afeb3e11 authored by Dave Airlie's avatar Dave Airlie
Browse files

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: default avatarDave Airlie <airlied@redhat.com>
parent cf22f20a
......@@ -35,6 +35,7 @@ static struct nouveau_dsm_priv {
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 @@ static bool nouveau_dsm_pci_probe(struct pci_dev *pdev)
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 @@ static bool nouveau_dsm_detect(void)
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 @@ void nouveau_unregister_dsm_handler(void)
{
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);
}
......@@ -178,6 +178,25 @@ out:
pci_disable_rom(dev->pdev);
}
static void load_vbios_acpi(struct drm_device *dev, uint8_t *data)
{
int i;
int ret;
int size = 64 * 1024;
if (!nouveau_acpi_rom_supported(dev->pdev))
return;
for (i = 0; i < (size / ROM_BIOS_PAGE); i++) {
ret = nouveau_acpi_get_bios_chunk(data,
(i * ROM_BIOS_PAGE),
ROM_BIOS_PAGE);
if (ret <= 0)
break;
}
return;
}
struct methods {
const char desc[8];
void (*loadbios)(struct drm_device *, uint8_t *);
......@@ -191,6 +210,7 @@ static struct methods nv04_methods[] = {
};
static struct methods nv50_methods[] = {
{ "ACPI", load_vbios_acpi, true },
{ "PRAMIN", load_vbios_pramin, true },
{ "PROM", load_vbios_prom, false },
{ "PCIROM", load_vbios_pci, true },
......
......@@ -851,12 +851,17 @@ extern int nouveau_dma_init(struct nouveau_channel *);
extern int nouveau_dma_wait(struct nouveau_channel *, int slots, int size);
/* nouveau_acpi.c */
#define ROM_BIOS_PAGE 4096
#if defined(CONFIG_ACPI)
void nouveau_register_dsm_handler(void);
void nouveau_unregister_dsm_handler(void);
int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len);
bool nouveau_acpi_rom_supported(struct pci_dev *pdev);
#else
static inline void nouveau_register_dsm_handler(void) {}
static inline void nouveau_unregister_dsm_handler(void) {}
static inline bool nouveau_acpi_rom_supported(struct pci_dev *pdev) { return false; }
static inline int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) { return -EINVAL; }
#endif
/* nouveau_backlight.c */
......
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