[PATCH 5/5] radeon: add dynamic power off support

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

This adds the start of dynamic power off support to radeon,
it probably turns off way to many GPUs but is an initial implementation
I've tested on an gm45/rv635 combination laptop.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/radeon/radeon.h        |  3 +++
 drivers/gpu/drm/radeon/radeon_device.c |  2 +-
 drivers/gpu/drm/radeon/radeon_drv.c    |  6 ++++++
 drivers/gpu/drm/radeon/radeon_pm.c     | 37 +++++++++++++++++++++++++++++++++-
 4 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 59a1531..0abad51 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1839,6 +1839,9 @@ extern int radeon_acpi_init(struct radeon_device *rdev);
 static inline int radeon_acpi_init(struct radeon_device *rdev) { return 0; } 
 #endif 
 
+extern bool radeon_dynamic_power_check(struct drm_device *dev);
+extern int radeon_dynamic_power_set_state(struct drm_device *dev, int state);
+
 #include "radeon_object.h"
 
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 857cf5b..c58849c 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1093,7 +1093,7 @@ int radeon_device_init(struct radeon_device *rdev,
 	/* this will fail for cards that aren't VGA class devices, just
 	 * ignore it */
 	vga_client_register(rdev->pdev, rdev, NULL, radeon_vga_set_decode);
-	vga_switcheroo_register_client(rdev->pdev, &radeon_switcheroo_ops, false);
+	vga_switcheroo_register_client(rdev->pdev, &radeon_switcheroo_ops, true);
 
 	r = radeon_init(rdev);
 	if (r)
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 8c593ea..b0a7211 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -118,6 +118,9 @@ struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
 struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev,
 					       struct dma_buf *dma_buf);
 
+bool radeon_dynamic_power_check(struct drm_device *dev);
+int radeon_dynamic_power_set_state(struct drm_device *dev, int state);
+
 #if defined(CONFIG_DEBUG_FS)
 int radeon_debugfs_init(struct drm_minor *minor);
 void radeon_debugfs_cleanup(struct drm_minor *minor);
@@ -385,6 +388,9 @@ static struct drm_driver kms_driver = {
 	.gem_prime_export = radeon_gem_prime_export,
 	.gem_prime_import = radeon_gem_prime_import,
 
+	.dynamic_off_check = radeon_dynamic_power_check,
+	.dynamic_set_state = radeon_dynamic_power_set_state,
+
 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,
 	.date = DRIVER_DATE,
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 7ae6066..2763ff1 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -30,7 +30,7 @@
 #include <linux/power_supply.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
-
+#include <linux/vga_switcheroo.h>
 #define RADEON_IDLE_LOOP_MS 100
 #define RADEON_RECLOCK_DELAY_MS 200
 #define RADEON_WAIT_VBLANK_TIMEOUT 200
@@ -643,6 +643,8 @@ int radeon_pm_init(struct radeon_device *rdev)
 		DRM_INFO("radeon: power management initialized\n");
 	}
 
+	drm_dynamic_power_init(rdev->ddev);
+
 	return 0;
 }
 
@@ -877,3 +879,36 @@ static int radeon_debugfs_pm_init(struct radeon_device *rdev)
 	return 0;
 #endif
 }
+
+bool radeon_dynamic_power_check(struct drm_device *dev)
+{
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+		if (crtc->enabled) {
+			DRM_DEBUG_DRIVER("failing to power off - crtc active\n");
+			return false;
+		}
+	}
+	return true;
+}
+
+int radeon_dynamic_power_set_state(struct drm_device *dev, int state)
+{
+       	pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
+
+	if (state == DRM_SWITCH_POWER_DYNAMIC_OFF) {
+		dev->switch_power_state = DRM_SWITCH_POWER_DYNAMIC_OFF;
+		vga_switcheroo_set_dynamic_switch(dev->pdev, VGA_SWITCHEROO_OFF, false);
+		drm_kms_helper_poll_disable(dev);
+		radeon_suspend_kms(dev, pmm);
+		vga_switcheroo_set_dynamic_switch(dev->pdev, VGA_SWITCHEROO_OFF, true);
+	} else {
+		vga_switcheroo_set_dynamic_switch(dev->pdev, VGA_SWITCHEROO_ON, true);
+		radeon_resume_kms(dev);
+		vga_switcheroo_set_dynamic_switch(dev->pdev, VGA_SWITCHEROO_ON, false);
+		drm_kms_helper_poll_enable(dev);
+		dev->switch_power_state = DRM_SWITCH_POWER_ON;
+	}
+	return 0;
+}
-- 
1.7.12