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ACPI video: remove output switching control
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Remove the ACPI video output switching control as it never works.

With the patch applied,
ACPI video driver still catches the video output notification,
but it does nothing but raises the notification to userspace.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Zhang Rui authored and Len Brown committed Dec 14, 2010
1 parent cf7d7e5 commit 677bd81
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Showing 5 changed files with 4 additions and 146 deletions.
5 changes: 0 additions & 5 deletions Documentation/kernel-parameters.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -199,11 +199,6 @@ and is between 256 and 4096 characters. It is defined in the file
unusable. The "log_buf_len" parameter may be useful
if you need to capture more output.

acpi_display_output= [HW,ACPI]
acpi_display_output=vendor
acpi_display_output=video
See above.

acpi_irq_balance [HW,ACPI]
ACPI will balance active IRQs
default in APIC mode
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86 changes: 0 additions & 86 deletions drivers/acpi/video.c
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,6 @@
#include <linux/input.h>
#include <linux/backlight.h>
#include <linux/thermal.h>
#include <linux/video_output.h>
#include <linux/sort.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
Expand Down Expand Up @@ -172,9 +171,6 @@ struct acpi_video_device_cap {
u8 _BQC:1; /* Get current brightness level */
u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
u8 _DDC:1; /*Return the EDID for this device */
u8 _DCS:1; /*Return status of output device */
u8 _DGS:1; /*Query graphics state */
u8 _DSS:1; /*Device state set */
};

struct acpi_video_brightness_flags {
Expand Down Expand Up @@ -202,7 +198,6 @@ struct acpi_video_device {
struct acpi_video_device_brightness *brightness;
struct backlight_device *backlight;
struct thermal_cooling_device *cooling_dev;
struct output_device *output_dev;
};

static const char device_decode[][30] = {
Expand All @@ -226,10 +221,6 @@ static int acpi_video_get_next_level(struct acpi_video_device *device,
u32 level_current, u32 event);
static int acpi_video_switch_brightness(struct acpi_video_device *device,
int event);
static int acpi_video_device_get_state(struct acpi_video_device *device,
unsigned long long *state);
static int acpi_video_output_get(struct output_device *od);
static int acpi_video_device_set_state(struct acpi_video_device *device, int state);

/*backlight device sysfs support*/
static int acpi_video_get_brightness(struct backlight_device *bd)
Expand Down Expand Up @@ -265,30 +256,6 @@ static struct backlight_ops acpi_backlight_ops = {
.update_status = acpi_video_set_brightness,
};

/*video output device sysfs support*/
static int acpi_video_output_get(struct output_device *od)
{
unsigned long long state;
struct acpi_video_device *vd =
(struct acpi_video_device *)dev_get_drvdata(&od->dev);
acpi_video_device_get_state(vd, &state);
return (int)state;
}

static int acpi_video_output_set(struct output_device *od)
{
unsigned long state = od->request_state;
struct acpi_video_device *vd=
(struct acpi_video_device *)dev_get_drvdata(&od->dev);
return acpi_video_device_set_state(vd, state);
}

static struct output_properties acpi_output_properties = {
.set_state = acpi_video_output_set,
.get_status = acpi_video_output_get,
};


/* thermal cooling device callbacks */
static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
long *state)
Expand Down Expand Up @@ -344,34 +311,6 @@ static struct thermal_cooling_device_ops video_cooling_ops = {
Video Management
-------------------------------------------------------------------------- */

/* device */

static int
acpi_video_device_get_state(struct acpi_video_device *device,
unsigned long long *state)
{
int status;

status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);

return status;
}

static int
acpi_video_device_set_state(struct acpi_video_device *device, int state)
{
int status;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
unsigned long long ret;


arg0.integer.value = state;
status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);

return status;
}

static int
acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
union acpi_object **levels)
Expand Down Expand Up @@ -831,15 +770,6 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
device->cap._DDC = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
device->cap._DCS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
device->cap._DGS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
device->cap._DSS = 1;
}

if (acpi_video_backlight_support()) {
struct backlight_properties props;
Expand Down Expand Up @@ -904,21 +834,6 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
printk(KERN_ERR PREFIX "Create sysfs link\n");

}

if (acpi_video_display_switch_support()) {

if (device->cap._DCS && device->cap._DSS) {
static int count;
char *name;
name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
if (!name)
return;
count++;
device->output_dev = video_output_register(name,
NULL, device, &acpi_output_properties);
kfree(name);
}
}
}

/*
Expand Down Expand Up @@ -1452,7 +1367,6 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
thermal_cooling_device_unregister(device->cooling_dev);
device->cooling_dev = NULL;
}
video_output_unregister(device->output_dev);

return 0;
}
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57 changes: 4 additions & 53 deletions drivers/acpi/video_detect.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,15 +17,14 @@
* capabilities the graphics cards plugged in support. The check for general
* video capabilities will be triggered by the first caller of
* acpi_video_get_capabilities(NULL); which will happen when the first
* backlight (or display output) switching supporting driver calls:
* backlight switching supporting driver calls:
* acpi_video_backlight_support();
*
* Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
* are available, video.ko should be used to handle the device.
*
* Otherwise vendor specific drivers like thinkpad_acpi, asus_acpi,
* sony_acpi,... can take care about backlight brightness and display output
* switching.
* sony_acpi,... can take care about backlight brightness.
*
* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
* this file will not be compiled, acpi_video_get_capabilities() and
Expand Down Expand Up @@ -83,11 +82,6 @@ long acpi_is_video_device(struct acpi_device *device)
if (!device)
return 0;

/* Is this device able to support video switching ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) ||
ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;

/* Is this device able to retrieve a video ROM ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
Expand Down Expand Up @@ -161,8 +155,6 @@ long acpi_video_get_capabilities(acpi_handle graphics_handle)
*
* if (dmi_name_in_vendors("XY")) {
* acpi_video_support |=
* ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR;
* acpi_video_support |=
* ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
*}
*/
Expand Down Expand Up @@ -212,33 +204,8 @@ int acpi_video_backlight_support(void)
EXPORT_SYMBOL(acpi_video_backlight_support);

/*
* Returns true if video.ko can do display output switching.
* This does not work well/at all with binary graphics drivers
* which disable system io ranges and do it on their own.
*/
int acpi_video_display_switch_support(void)
{
if (!acpi_video_caps_checked)
acpi_video_get_capabilities(NULL);

if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR)
return 0;
else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO)
return 1;

if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR)
return 0;
else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO)
return 1;

return acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING;
}
EXPORT_SYMBOL(acpi_video_display_switch_support);

/*
* Use acpi_display_output=vendor/video or acpi_backlight=vendor/video
* To force that backlight or display output switching is processed by vendor
* specific acpi drivers or video.ko driver.
* Use acpi_backlight=vendor/video to force that backlight switching
* is processed by vendor specific acpi drivers or video.ko driver.
*/
static int __init acpi_backlight(char *str)
{
Expand All @@ -255,19 +222,3 @@ static int __init acpi_backlight(char *str)
return 1;
}
__setup("acpi_backlight=", acpi_backlight);

static int __init acpi_display_output(char *str)
{
if (str == NULL || *str == '\0')
return 1;
else {
if (!strcmp("vendor", str))
acpi_video_support |=
ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR;
if (!strcmp("video", str))
acpi_video_support |=
ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO;
}
return 1;
}
__setup("acpi_display_output=", acpi_display_output);
1 change: 0 additions & 1 deletion drivers/gpu/drm/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -107,7 +107,6 @@ config DRM_I915
select FB_CFB_IMAGEBLIT
# i915 depends on ACPI_VIDEO when ACPI is enabled
# but for select to work, need to select ACPI_VIDEO's dependencies, ick
select VIDEO_OUTPUT_CONTROL if ACPI
select BACKLIGHT_CLASS_DEVICE if ACPI
select INPUT if ACPI
select ACPI_VIDEO if ACPI
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1 change: 0 additions & 1 deletion drivers/gpu/stub/Kconfig
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Expand Up @@ -3,7 +3,6 @@ config STUB_POULSBO
depends on PCI
# Poulsbo stub depends on ACPI_VIDEO when ACPI is enabled
# but for select to work, need to select ACPI_VIDEO's dependencies, ick
select VIDEO_OUTPUT_CONTROL if ACPI
select BACKLIGHT_CLASS_DEVICE if ACPI
select INPUT if ACPI
select ACPI_VIDEO if ACPI
Expand Down

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