Re: [PATCH] drm/radeon: add new AMD ACPI header and update relevant code

[Luca Tettamanti <kronos.it@gmail.com>]

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On Tue, Jul 31, 2012 at 09:58:04AM -0400, Alex Deucher wrote:
> On Tue, Jul 31, 2012 at 5:16 AM, Luca Tettamanti <kronos.it@gmail.com> wrote:
> > On Mon, Jul 30, 2012 at 10:45 PM, Alex Deucher <alexdeucher@gmail.com> wrote:
> >> Regarding patches 3 and 4, it might be easier to just store a pointer
> >> to the relevant encoder when you verify ATIF rather than walking the
> >> encoder list every time.

Done.

> > Makes sense, I was unsure about the lifetime of the encoders, but
> > AFAICS they're destroyed only when the module in unloaded.
> 
> They are present for the life of the driver.

I had to move to call to radeon_acpi_init after radeon_modeset_init,
otherwise the encoders are not present yet (the tear down code path is
correct, acpi first, then modeset).
Latest and greatest version is attached; I fixed notifications when
using custom command codes (tested by Pali Rohár) and implemented your
suggestion. 

Luca

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>From f0f8699eabee0d47b93fba14f8126b821cc106a5 Mon Sep 17 00:00:00 2001
From: Luca Tettamanti <kronos.it@gmail.com>
Date: Sun, 29 Jul 2012 17:04:43 +0200
Subject: [PATCH 1/4] drm/radeon: refactor radeon_atif_call

Don't hard-code function number, this will allow to reuse the function.
v2: add support for the 2nd parameter (from Lee, Chun-Yi
<jlee@suse.com>).

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
---
 drivers/gpu/drm/radeon/radeon_acpi.c |   38 ++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 5b32e49..158e514 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -14,23 +14,30 @@
 #include <linux/vga_switcheroo.h>
 
 /* Call the ATIF method
- *
- * Note: currently we discard the output
  */
-static int radeon_atif_call(acpi_handle handle)
+static union acpi_object *radeon_atif_call(acpi_handle handle, int function,
+		struct acpi_buffer *params)
 {
 	acpi_status status;
 	union acpi_object atif_arg_elements[2];
 	struct acpi_object_list atif_arg;
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 
 	atif_arg.count = 2;
 	atif_arg.pointer = &atif_arg_elements[0];
 
 	atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
-	atif_arg_elements[0].integer.value = ATIF_FUNCTION_VERIFY_INTERFACE;
-	atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
-	atif_arg_elements[1].integer.value = 0;
+	atif_arg_elements[0].integer.value = function;
+
+	if (params) {
+		atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
+		atif_arg_elements[1].buffer.length = params->length;
+		atif_arg_elements[1].buffer.pointer = params->pointer;
+	} else {
+		/* We need a second fake parameter */
+		atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
+		atif_arg_elements[1].integer.value = 0;
+	}
 
 	status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
 
@@ -39,18 +46,18 @@ static int radeon_atif_call(acpi_handle handle)
 		DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
 				 acpi_format_exception(status));
 		kfree(buffer.pointer);
-		return 1;
+		return NULL;
 	}
 
-	kfree(buffer.pointer);
-	return 0;
+	return buffer.pointer;
 }
 
 /* Call all ACPI methods here */
 int radeon_acpi_init(struct radeon_device *rdev)
 {
 	acpi_handle handle;
-	int ret;
+	union acpi_object *info;
+	int ret = 0;
 
 	/* Get the device handle */
 	handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
@@ -60,10 +67,11 @@ int radeon_acpi_init(struct radeon_device *rdev)
 		return 0;
 
 	/* Call the ATIF method */
-	ret = radeon_atif_call(handle);
-	if (ret)
-		return ret;
+	info = radeon_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
+	if (!info)
+		ret = -EIO;
 
-	return 0;
+	kfree(info);
+	return ret;
 }
 
-- 
1.7.10.4


[-- Attachment #3: 0002-drm-radeon-implement-radeon_atif_verify_interface.patch --]
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>From 427002ddf653b0abd0fb820b09322bf2a0b281af Mon Sep 17 00:00:00 2001
From: Luca Tettamanti <kronos.it@gmail.com>
Date: Mon, 30 Jul 2012 21:11:58 +0200
Subject: [PATCH 2/4] drm/radeon: implement radeon_atif_verify_interface

Wrap the call to VERIFY_INTERFACE and add the parsing of the support
vectors.
v2: use a packed struct for handling the output of ACPI calls, hides
ugly pointer arithmetics (Lee, Chun-Yi <jlee@suse.com>).

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
---
 drivers/gpu/drm/radeon/radeon.h      |   40 +++++++++++++++++
 drivers/gpu/drm/radeon/radeon_acpi.c |   79 +++++++++++++++++++++++++++++++---
 2 files changed, 113 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index fefcca5..0db98eb 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1456,6 +1456,44 @@ struct r600_vram_scratch {
 	u64				gpu_addr;
 };
 
+/*
+ * ACPI
+ */
+struct radeon_atif_notification_cfg {
+	bool enabled;
+	int command_code;
+};
+
+struct radeon_atif_notifications {
+	bool display_switch;
+	bool expansion_mode_change;
+	bool thermal_state;
+	bool forced_power_state;
+	bool system_power_state;
+	bool display_conf_change;
+	bool px_gfx_switch;
+	bool brightness_change;
+	bool dgpu_display_event;
+};
+
+struct radeon_atif_functions {
+	bool system_params;
+	bool sbios_requests;
+	bool select_active_disp;
+	bool lid_state;
+	bool get_tv_standard;
+	bool set_tv_standard;
+	bool get_panel_expansion_mode;
+	bool set_panel_expansion_mode;
+	bool temperature_change;
+	bool graphics_device_types;
+};
+
+struct radeon_atif {
+	struct radeon_atif_notifications notifications;
+	struct radeon_atif_functions functions;
+	struct radeon_atif_notification_cfg notification_cfg;
+};
 
 /*
  * Core structure, functions and helpers.
@@ -1548,6 +1586,8 @@ struct radeon_device {
 	unsigned 		debugfs_count;
 	/* virtual memory */
 	struct radeon_vm_manager	vm_manager;
+	/* ACPI interface */
+	struct radeon_atif		atif;
 };
 
 int radeon_device_init(struct radeon_device *rdev,
diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 158e514..53c519d 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -13,6 +13,13 @@
 
 #include <linux/vga_switcheroo.h>
 
+struct atif_verify_interface {
+	u16 size;		/* structure size in bytes (includes size field) */
+	u16 version;		/* version */
+	u32 notification_mask;	/* supported notifications mask */
+	u32 function_bits;	/* supported functions bit vector */
+} __packed;
+
 /* Call the ATIF method
  */
 static union acpi_object *radeon_atif_call(acpi_handle handle, int function,
@@ -52,12 +59,73 @@ static union acpi_object *radeon_atif_call(acpi_handle handle, int function,
 	return buffer.pointer;
 }
 
+static void radeon_atif_parse_notification(struct radeon_atif_notifications *n, u32 mask)
+{
+	n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
+	n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
+	n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
+	n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
+	n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
+	n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
+	n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
+	n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
+	n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
+}
+
+static void radeon_atif_parse_functions(struct radeon_atif_functions *f, u32 mask)
+{
+	f->system_params = ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
+	f->sbios_requests = ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
+	f->select_active_disp = ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
+	f->lid_state = ATIF_GET_LID_STATE_SUPPORTED;
+	f->get_tv_standard = ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
+	f->set_tv_standard = ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
+	f->get_panel_expansion_mode = ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
+	f->set_panel_expansion_mode = ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
+	f->temperature_change = ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
+	f->graphics_device_types = ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
+}
+
+static int radeon_atif_verify_interface(acpi_handle handle,
+		struct radeon_atif *atif)
+{
+	union acpi_object *info;
+	struct atif_verify_interface output;
+	size_t size;
+	int err = 0;
+
+	info = radeon_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
+	if (!info)
+		return -EIO;
+
+	memset(&output, 0, sizeof(output));
+
+	size = *(u16 *) info->buffer.pointer;
+	if (size < 12) {
+		DRM_INFO("ATIF buffer is too small: %lu\n", size);
+		err = -EINVAL;
+		goto out;
+	}
+	size = min(sizeof(output), size);
+
+	memcpy(&output, info->buffer.pointer, size);
+
+	/* TODO: check version? */
+	DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
+
+	radeon_atif_parse_notification(&atif->notifications, output.notification_mask);
+	radeon_atif_parse_functions(&atif->functions, output.function_bits);
+
+out:
+	kfree(info);
+	return err;
+}
+
 /* Call all ACPI methods here */
 int radeon_acpi_init(struct radeon_device *rdev)
 {
 	acpi_handle handle;
-	union acpi_object *info;
-	int ret = 0;
+	int ret;
 
 	/* Get the device handle */
 	handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
@@ -67,11 +135,10 @@ int radeon_acpi_init(struct radeon_device *rdev)
 		return 0;
 
 	/* Call the ATIF method */
-	info = radeon_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
-	if (!info)
-		ret = -EIO;
+	ret = radeon_atif_verify_interface(handle, &rdev->atif);
+	if (ret)
+		DRM_DEBUG_DRIVER("Call to verify_interface failed: %d\n", ret);
 
-	kfree(info);
 	return ret;
 }
 
-- 
1.7.10.4


[-- Attachment #4: 0003-drm-radeon-implement-wrapper-for-GET_SYSTEM_PARAMS.patch --]
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>From e83d04d1b60c5cf46611f6afc9680024e1dad73b Mon Sep 17 00:00:00 2001
From: Luca Tettamanti <kronos.it@gmail.com>
Date: Mon, 30 Jul 2012 21:16:06 +0200
Subject: [PATCH 3/4] drm/radeon: implement wrapper for GET_SYSTEM_PARAMS

Use GET_SYSTEM_PARAMS for retrieving the configuration for the system
BIOS notifications.
v2: packed struct (Lee, Chun-Yi <jlee@suse.com>)

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
---
 drivers/gpu/drm/radeon/radeon_acpi.c |   84 +++++++++++++++++++++++++++++++++-
 1 file changed, 82 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 53c519d..3d025dd 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -20,6 +20,18 @@ struct atif_verify_interface {
 	u32 function_bits;	/* supported functions bit vector */
 } __packed;
 
+struct atif_system_params {
+	u16 size;
+	u32 valid_mask;
+	u32 flags;
+	u8 command_code;
+} __packed;
+
+#define ATIF_NOTIFY_MASK	0x3
+#define ATIF_NOTIFY_NONE	0
+#define ATIF_NOTIFY_81		1
+#define ATIF_NOTIFY_N		2
+
 /* Call the ATIF method
  */
 static union acpi_object *radeon_atif_call(acpi_handle handle, int function,
@@ -121,10 +133,56 @@ out:
 	return err;
 }
 
+static int radeon_atif_get_notification_params(acpi_handle handle,
+		struct radeon_atif_notification_cfg *n)
+{
+	union acpi_object *info;
+	struct atif_system_params params;
+	size_t size;
+	int err = 0;
+
+	info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
+	if (!info) {
+		err = -EIO;
+		goto out;
+	}
+
+	size = *(u16 *) info->buffer.pointer;
+	if (size < 10) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	memset(&params, 0, sizeof(params));
+	size = min(sizeof(params), size);
+	memcpy(&params, info->buffer.pointer, size);
+
+	params.flags = params.flags & params.valid_mask;
+
+	if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
+		n->enabled = false;
+		n->command_code = 0;
+	} else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
+		n->enabled = true;
+		n->command_code = 0x81;
+	} else {
+		if (size < 11) {
+			err = -EINVAL;
+			goto out;
+		}
+		n->command_code = params.command_code;
+	}
+
+out:
+	kfree(info);
+	return err;
+}
+
 /* Call all ACPI methods here */
 int radeon_acpi_init(struct radeon_device *rdev)
 {
 	acpi_handle handle;
+	struct radeon_atif *atif = &rdev->atif;
 	int ret;
 
 	/* Get the device handle */
@@ -135,10 +193,32 @@ int radeon_acpi_init(struct radeon_device *rdev)
 		return 0;
 
 	/* Call the ATIF method */
-	ret = radeon_atif_verify_interface(handle, &rdev->atif);
-	if (ret)
+	ret = radeon_atif_verify_interface(handle, atif);
+	if (ret) {
 		DRM_DEBUG_DRIVER("Call to verify_interface failed: %d\n", ret);
+		goto out;
+	}
+
+	if (atif->functions.sbios_requests && !atif->functions.system_params) {
+		/* XXX check this workraround, if sbios request function is
+		 * present we have to see how it's configured in the system
+		 * params
+		 */
+		atif->functions.system_params = true;
+	}
+
+	if (atif->functions.system_params) {
+		ret = radeon_atif_get_notification_params(handle,
+				&atif->notification_cfg);
+		if (ret) {
+			DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
+					ret);
+			/* Disable notification */
+			atif->notification_cfg.enabled = false;
+		}
+	}
 
+out:
 	return ret;
 }
 
-- 
1.7.10.4


[-- Attachment #5: 0004-drm-radeon-implement-handler-for-ACPI-event.patch --]
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>From 88a3e35a0495cfff7d1a8ea23b779c621b3e1faa Mon Sep 17 00:00:00 2001
From: Luca Tettamanti <kronos.it@gmail.com>
Date: Mon, 30 Jul 2012 21:20:35 +0200
Subject: [PATCH 4/4] drm/radeon: implement handler for ACPI event
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Set up an handler for ACPI events and respond to brightness change
requests from the system BIOS.
v2: fix notification when using device-specific command codes
(tested by Pali Rohár <pali.rohar@gmail.com>); cache the encoder
controlling the backlight during the initialization to avoid searching
it every time (suggested by Alex Deucher).

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
---
 drivers/gpu/drm/radeon/atombios_encoders.c |    2 +-
 drivers/gpu/drm/radeon/radeon.h            |    1 +
 drivers/gpu/drm/radeon/radeon_acpi.c       |  132 +++++++++++++++++++++++++++-
 drivers/gpu/drm/radeon/radeon_acpi.h       |    6 ++
 drivers/gpu/drm/radeon/radeon_kms.c        |   16 ++--
 drivers/gpu/drm/radeon/radeon_mode.h       |    2 +
 drivers/gpu/drm/radeon/radeon_pm.c         |    4 +-
 7 files changed, 152 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index c2d3552..e4152d6 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -72,7 +72,7 @@ radeon_atom_set_backlight_level_to_reg(struct radeon_device *rdev,
 		WREG32(RADEON_BIOS_2_SCRATCH, bios_2_scratch);
 }
 
-static void
+void
 atombios_set_panel_brightness(struct radeon_encoder *radeon_encoder)
 {
 	struct drm_encoder *encoder = &radeon_encoder->base;
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 0db98eb..a57795b 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1493,6 +1493,7 @@ struct radeon_atif {
 	struct radeon_atif_notifications notifications;
 	struct radeon_atif_functions functions;
 	struct radeon_atif_notification_cfg notification_cfg;
+	struct radeon_encoder *backlight_ctl;
 };
 
 /*
diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 3d025dd..9a97914 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -3,6 +3,7 @@
 #include <linux/slab.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/acpi_bus.h>
+#include <acpi/video.h>
 
 #include "drmP.h"
 #include "drm.h"
@@ -10,6 +11,7 @@
 #include "drm_crtc_helper.h"
 #include "radeon.h"
 #include "radeon_acpi.h"
+#include "atom.h"
 
 #include <linux/vga_switcheroo.h>
 
@@ -21,10 +23,22 @@ struct atif_verify_interface {
 } __packed;
 
 struct atif_system_params {
-	u16 size;
-	u32 valid_mask;
-	u32 flags;
-	u8 command_code;
+	u16 size;		/* structure size in bytes (includes size field) */
+	u32 valid_mask;		/* valid flags mask */
+	u32 flags;		/* flags */
+	u8 command_code;	/* notify command code */
+} __packed;
+
+struct atif_sbios_requests {
+	u16 size;		/* structure size in bytes (includes size field) */
+	u32 pending;		/* pending sbios requests */
+	u8 panel_exp_mode;	/* panel expansion mode */
+	u8 thermal_gfx;		/* thermal state: target gfx controller */
+	u8 thermal_state;	/* thermal state: state id (0: exit state, non-0: state) */
+	u8 forced_power_gfx;	/* forced power state: target gfx controller */
+	u8 forced_power_state;	/* forced power state: state id */
+	u8 system_power_src;	/* system power source */
+	u8 backlight_level;	/* panel backlight level (0-255) */
 } __packed;
 
 #define ATIF_NOTIFY_MASK	0x3
@@ -157,6 +171,8 @@ static int radeon_atif_get_notification_params(acpi_handle handle,
 	size = min(sizeof(params), size);
 	memcpy(&params, info->buffer.pointer, size);
 
+	DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
+			params.flags, params.valid_mask);
 	params.flags = params.flags & params.valid_mask;
 
 	if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
@@ -174,10 +190,91 @@ static int radeon_atif_get_notification_params(acpi_handle handle,
 	}
 
 out:
+	DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
+			(n->enabled ? "enabled" : "disabled"),
+			n->command_code);
 	kfree(info);
 	return err;
 }
 
+static int radeon_atif_get_sbios_requests(acpi_handle handle,
+		struct atif_sbios_requests *req)
+{
+	union acpi_object *info;
+	size_t size;
+	int count = 0;
+
+	info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
+	if (!info)
+		return -EIO;
+
+	size = *(u16 *)info->buffer.pointer;
+	if (size < 0xd) {
+		count = -EINVAL;
+		goto out;
+	}
+	memset(req, 0, sizeof(*req));
+
+	size = min(sizeof(*req), size);
+	memcpy(req, info->buffer.pointer, size);
+	DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
+
+	count = hweight32(req->pending);
+
+out:
+	kfree(info);
+	return count;
+}
+
+int radeon_atif_handler(struct radeon_device *rdev,
+		struct acpi_bus_event *event)
+{
+	struct radeon_atif *atif = &rdev->atif;
+	struct atif_sbios_requests req;
+	acpi_handle handle;
+	int count;
+
+	DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
+			event->device_class, event->type);
+	
+	if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
+		return NOTIFY_DONE;
+
+	if (!atif->notification_cfg.enabled ||
+			event->type != atif->notification_cfg.command_code)
+		/* Not our event */
+		return NOTIFY_DONE;
+
+	/* Check pending SBIOS requests */
+	handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
+	count = radeon_atif_get_sbios_requests(handle, &req);
+
+	if (count <= 0)
+		return NOTIFY_DONE;
+
+	DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
+
+	if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
+		struct radeon_encoder *enc = atif->backlight_ctl;
+
+		if (enc) {
+			struct radeon_encoder_atom_dig *dig = enc->enc_priv;
+			dig->backlight_level = req.backlight_level;
+			
+			DRM_DEBUG_DRIVER("Changing brightness to %d\n", 
+					req.backlight_level);
+
+			atombios_set_panel_brightness(enc);
+
+			backlight_force_update(dig->bl_dev,
+					BACKLIGHT_UPDATE_HOTKEY);
+		}
+	}
+	/* TODO: check other events */
+
+	return NOTIFY_OK;
+}
+
 /* Call all ACPI methods here */
 int radeon_acpi_init(struct radeon_device *rdev)
 {
@@ -199,6 +296,33 @@ int radeon_acpi_init(struct radeon_device *rdev)
 		goto out;
 	}
 
+	if (atif->notifications.brightness_change) {
+		struct drm_encoder *tmp;
+		struct radeon_encoder *target = NULL;
+
+		/* Find the encoder controlling the brightness */
+		list_for_each_entry(tmp, &rdev->ddev->mode_config.encoder_list,
+				head) {
+			struct radeon_encoder *enc = to_radeon_encoder(tmp);
+			struct radeon_encoder_atom_dig *dig = enc->enc_priv;
+
+			if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
+					dig->bl_dev != NULL) {
+				target = enc;
+				break;
+			}
+		}
+
+		atif->backlight_ctl = target;
+		if (!target) {
+			/* Brightness change notification is enabled, but we
+			 * didn't find a backlight controller, this should
+			 * never happen.
+			 */
+			DRM_ERROR("Cannot find a backlight controller\n");
+		}
+	}
+
 	if (atif->functions.sbios_requests && !atif->functions.system_params) {
 		/* XXX check this workraround, if sbios request function is
 		 * present we have to see how it's configured in the system
diff --git a/drivers/gpu/drm/radeon/radeon_acpi.h b/drivers/gpu/drm/radeon/radeon_acpi.h
index a42288d..df1f162 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.h
+++ b/drivers/gpu/drm/radeon/radeon_acpi.h
@@ -24,6 +24,12 @@
 #ifndef RADEON_ACPI_H
 #define RADEON_ACPI_H
 
+struct radeon_device;
+struct acpi_bus_event;
+
+int radeon_atif_handler(struct radeon_device *rdev,
+		struct acpi_bus_event *event);
+
 /* AMD hw uses four ACPI control methods:
  * 1. ATIF
  * ARG0: (ACPI_INTEGER) function code
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 5c58d7d..a13b2eb 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -78,11 +78,6 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
 		goto out;
 	}
 
-	/* Call ACPI methods */
-	acpi_status = radeon_acpi_init(rdev);
-	if (acpi_status)
-		dev_dbg(&dev->pdev->dev, "Error during ACPI methods call\n");
-
 	/* Again modeset_init should fail only on fatal error
 	 * otherwise it should provide enough functionalities
 	 * for shadowfb to run
@@ -90,6 +85,17 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
 	r = radeon_modeset_init(rdev);
 	if (r)
 		dev_err(&dev->pdev->dev, "Fatal error during modeset init\n");
+	
+	/* Call ACPI methods: require modeset init
+	 * but failure is not fatal
+	 */
+	if (!r) {
+		acpi_status = radeon_acpi_init(rdev);
+		if (acpi_status)
+		dev_dbg(&dev->pdev->dev,
+				"Error during ACPI methods call\n");
+	}
+
 out:
 	if (r)
 		radeon_driver_unload_kms(dev);
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 129ed8e..ce91d62 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -697,6 +697,8 @@ void radeon_panel_mode_fixup(struct drm_encoder *encoder,
 			     struct drm_display_mode *adjusted_mode);
 void atom_rv515_force_tv_scaler(struct radeon_device *rdev, struct radeon_crtc *radeon_crtc);
 
+void atombios_set_panel_brightness(struct radeon_encoder *radeon_encoder);
+
 /* legacy tv */
 void radeon_legacy_tv_adjust_crtc_reg(struct drm_encoder *encoder,
 				      uint32_t *h_total_disp, uint32_t *h_sync_strt_wid,
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 5b37e28..8621748 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -22,6 +22,7 @@
  */
 #include "drmP.h"
 #include "radeon.h"
+#include "radeon_acpi.h"
 #include "avivod.h"
 #include "atom.h"
 #ifdef CONFIG_ACPI
@@ -95,7 +96,8 @@ static int radeon_acpi_event(struct notifier_block *nb,
 		}
 	}
 
-	return NOTIFY_OK;
+	/* Check for pending SBIOS requests */
+	return radeon_atif_handler(rdev, entry);
 }
 #endif
 
-- 
1.7.10.4


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