vga_switcheroo: initial implementation (v15)
Many new laptops now come with 2 gpus, one to be used for low power
modes and one for gaming/on-ac applications. These GPUs are typically
wired to the laptop panel and VGA ports via a multiplexer unit which
is controlled via ACPI methods.
4 combinations of systems typically exist - with 2 ACPI methods.
Intel/ATI - Lenovo W500/T500 - use ATPX ACPI method
ATI/ATI - some ASUS - use ATPX ACPI Method
Intel/Nvidia - - use _DSM ACPI method
Nvidia/Nvidia - - use _DSM ACPI method.
TODO:
This patch adds support for the ATPX method and initial bits
for the _DSM methods that need to written by someone with
access to the hardware.
Add a proper non-debugfs interface - need to get some proper
testing first.
v2: add power up/down support for both devices
on W500 puts i915/radeon into D3 and cuts power to radeon.
v3: redo probing methods, no DMI list, drm devices call to
register with switcheroo, it tries to find an ATPX method on
any device and once there is two devices + ATPX it inits the
switcher.
v4: ATPX msg handling using buffers - should work on more machines
v5: rearchitect after more mjg59 discussion - move ATPX handling to
radeon driver.
v6: add file headers + initial nouveau bits (to be filled out).
v7: merge delayed switcher code.
v8: avoid suspend/resume of gpu that is off
v9: rearchitect - mjg59 is always right. - move all ATPX code to
radeon, should allow simpler DSM also proper ATRM handling
v10: add ATRM support for radeon BIOS, add mutex to lock vgasr_priv
v11: fix bug in resuming Intel for 2nd time.
v12: start fixing up nvidia code blindly.
v13: blindly guess at finishing nvidia code
v14: remove radeon audio hacks - fix up intel resume more like upstream
v15: clean up printks + remove unnecessary igd/dis pointers
mount debugfs
/sys/kernel/debug/vgaswitcheroo/switch - should exist if ATPX detected
+ 2 cards.
DIS - immediate change to discrete
IGD - immediate change to IGD
DDIS - delayed change to discrete
DIGD - delayed change to IGD
ON - turn on not in use
OFF - turn off not in use
Tested on W500 (Intel/ATI) and T500 (Intel/ATI)
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 9069217..a34b909 100644
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -30,6 +30,7 @@
#include "radeon.h"
#include "atom.h"
+#include <linux/vga_switcheroo.h>
/*
* BIOS.
*/
@@ -62,7 +63,7 @@
iounmap(bios);
return false;
}
- memcpy(rdev->bios, bios, size);
+ memcpy_fromio(rdev->bios, bios, size);
iounmap(bios);
return true;
}
@@ -93,6 +94,38 @@
return true;
}
+/* ATRM is used to get the BIOS on the discrete cards in
+ * dual-gpu systems.
+ */
+static bool radeon_atrm_get_bios(struct radeon_device *rdev)
+{
+ int ret;
+ int size = 64 * 1024;
+ int i;
+
+ if (!radeon_atrm_supported(rdev->pdev))
+ return false;
+
+ rdev->bios = kmalloc(size, GFP_KERNEL);
+ if (!rdev->bios) {
+ DRM_ERROR("Unable to allocate bios\n");
+ return false;
+ }
+
+ for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
+ ret = radeon_atrm_get_bios_chunk(rdev->bios,
+ (i * ATRM_BIOS_PAGE),
+ ATRM_BIOS_PAGE);
+ if (ret <= 0)
+ break;
+ }
+
+ if (i == 0 || rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
+ kfree(rdev->bios);
+ return false;
+ }
+ return true;
+}
static bool r700_read_disabled_bios(struct radeon_device *rdev)
{
uint32_t viph_control;
@@ -388,16 +421,16 @@
return legacy_read_disabled_bios(rdev);
}
+
bool radeon_get_bios(struct radeon_device *rdev)
{
bool r;
uint16_t tmp;
- if (rdev->flags & RADEON_IS_IGP) {
+ r = radeon_atrm_get_bios(rdev);
+ if (r == false)
r = igp_read_bios_from_vram(rdev);
- if (r == false)
- r = radeon_read_bios(rdev);
- } else
+ if (r == false)
r = radeon_read_bios(rdev);
if (r == false) {
r = radeon_read_disabled_bios(rdev);
@@ -408,6 +441,7 @@
return false;
}
if (rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
+ printk("BIOS signature incorrect %x %x\n", rdev->bios[0], rdev->bios[1]);
goto free_bios;
}