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![Michael Karcher](/assets/img/avatar_default.png)
This patch reverts one hunk of 677bd810ee
"ACPI video: remove output switching control", namely the removal of
probing for _DOS/_DOD when searching for video devices.
This is needed on some Fujitsu Laptops (at least S7110, P8010) for the
ACPI backlight interface to work, as an these machines, neither ROM nor
posting methods are available, and after removal of output switching,
none of the caps triggers, which prevents the backlight search from
being entered.
Tested on a Fujitsu Lifebook S7110 and Fujitsu Lifebook P8010.
This probably fixes https://bugzilla.kernel.org/show_bug.cgi?id=27312
for the people who have no entry in /sys/class/backlight.
This is the complete list of public (starting with "_") methods implemented
on the S7110, BIOS rev 1.34:
\_SB_.PCI0.GFX0._ADR
\_SB_.PCI0.GFX0._DOS
\_SB_.PCI0.GFX0._DOD
\_SB_.PCI0.GFX0.CRT._ADR
\_SB_.PCI0.GFX0.CRT._DCS
\_SB_.PCI0.GFX0.CRT._DGS
\_SB_.PCI0.GFX0.CRT._DSS
\_SB_.PCI0.GFX0.LCD._ADR
\_SB_.PCI0.GFX0.LCD._BCL
\_SB_.PCI0.GFX0.LCD._BCM
\_SB_.PCI0.GFX0.LCD._BQC
\_SB_.PCI0.GFX0.LCD._DCS
\_SB_.PCI0.GFX0.LCD._DGS
\_SB_.PCI0.GFX0.LCD._DSS
\_SB_.PCI0.GFX0.LCD._PS0
\_SB_.PCI0.GFX0.LCD._PS3
\_SB_.PCI0.GFX0.TV._ADR
\_SB_.PCI0.GFX0.TV._DCS
\_SB_.PCI0.GFX0.TV._DGS
\_SB_.PCI0.GFX0.TV._DSS
\_SB_.PCI0.GFX0.DVI._ADR
\_SB_.PCI0.GFX0.DVI._DCS
\_SB_.PCI0.GFX0.DVI._DGS
\_SB_.PCI0.GFX0.DVI._DSS
Signed-off-by: Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
229 lines
7.3 KiB
C
229 lines
7.3 KiB
C
/*
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* Copyright (C) 2008 SuSE Linux Products GmbH
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* Thomas Renninger <trenn@suse.de>
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*
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* May be copied or modified under the terms of the GNU General Public License
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*
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* video_detect.c:
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* Provides acpi_is_video_device() for early scanning of ACPI devices in scan.c
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* There a Linux specific (Spec does not provide a HID for video devices) is
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* assigned
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*
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* After PCI devices are glued with ACPI devices
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* acpi_get_pci_dev() can be called to identify ACPI graphics
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* devices for which a real graphics card is plugged in
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*
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* Now acpi_video_get_capabilities() can be called to check which
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* capabilities the graphics cards plugged in support. The check for general
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* video capabilities will be triggered by the first caller of
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* acpi_video_get_capabilities(NULL); which will happen when the first
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* backlight switching supporting driver calls:
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* acpi_video_backlight_support();
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*
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* Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
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* are available, video.ko should be used to handle the device.
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*
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* Otherwise vendor specific drivers like thinkpad_acpi, asus_acpi,
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* sony_acpi,... can take care about backlight brightness.
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*
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* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
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* this file will not be compiled, acpi_video_get_capabilities() and
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* acpi_video_backlight_support() will always return 0 and vendor specific
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* drivers always can handle backlight.
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*
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*/
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/pci.h>
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#define PREFIX "ACPI: "
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ACPI_MODULE_NAME("video");
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#define _COMPONENT ACPI_VIDEO_COMPONENT
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static long acpi_video_support;
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static bool acpi_video_caps_checked;
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static acpi_status
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acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
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void **retyurn_value)
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{
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long *cap = context;
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acpi_handle h_dummy;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_BCM", &h_dummy)) &&
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ACPI_SUCCESS(acpi_get_handle(handle, "_BCL", &h_dummy))) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
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"support\n"));
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*cap |= ACPI_VIDEO_BACKLIGHT;
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if (ACPI_FAILURE(acpi_get_handle(handle, "_BQC", &h_dummy)))
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printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
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"cannot determine initial brightness\n");
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/* We have backlight support, no need to scan further */
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return AE_CTRL_TERMINATE;
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}
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return 0;
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}
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/* Returns true if the device is a video device which can be handled by
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* video.ko.
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* The device will get a Linux specific CID added in scan.c to
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* identify the device as an ACPI graphics device
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* Be aware that the graphics device may not be physically present
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* Use acpi_video_get_capabilities() to detect general ACPI video
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* capabilities of present cards
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*/
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long acpi_is_video_device(struct acpi_device *device)
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{
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acpi_handle h_dummy;
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long video_caps = 0;
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if (!device)
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return 0;
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/* Is this device able to support video switching ? */
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if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) ||
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ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
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video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
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/* Is this device able to retrieve a video ROM ? */
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if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
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video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
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/* Is this device able to configure which video head to be POSTed ? */
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if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
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ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
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ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
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video_caps |= ACPI_VIDEO_DEVICE_POSTING;
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/* Only check for backlight functionality if one of the above hit. */
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if (video_caps)
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acpi_walk_namespace(ACPI_TYPE_DEVICE, device->handle,
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ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
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&video_caps, NULL);
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return video_caps;
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}
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EXPORT_SYMBOL(acpi_is_video_device);
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static acpi_status
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find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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long *cap = context;
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struct pci_dev *dev;
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struct acpi_device *acpi_dev;
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const struct acpi_device_id video_ids[] = {
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{ACPI_VIDEO_HID, 0},
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{"", 0},
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};
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if (acpi_bus_get_device(handle, &acpi_dev))
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return AE_OK;
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if (!acpi_match_device_ids(acpi_dev, video_ids)) {
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dev = acpi_get_pci_dev(handle);
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if (!dev)
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return AE_OK;
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pci_dev_put(dev);
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*cap |= acpi_is_video_device(acpi_dev);
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}
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return AE_OK;
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}
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/*
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* Returns the video capabilities of a specific ACPI graphics device
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*
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* if NULL is passed as argument all ACPI devices are enumerated and
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* all graphics capabilities of physically present devices are
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* summarized and returned. This is cached and done only once.
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*/
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long acpi_video_get_capabilities(acpi_handle graphics_handle)
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{
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long caps = 0;
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struct acpi_device *tmp_dev;
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acpi_status status;
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if (acpi_video_caps_checked && graphics_handle == NULL)
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return acpi_video_support;
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if (!graphics_handle) {
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/* Only do the global walk through all graphics devices once */
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acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, find_video, NULL,
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&caps, NULL);
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/* There might be boot param flags set already... */
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acpi_video_support |= caps;
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acpi_video_caps_checked = 1;
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/* Add blacklists here. Be careful to use the right *DMI* bits
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* to still be able to override logic via boot params, e.g.:
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*
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* if (dmi_name_in_vendors("XY")) {
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* acpi_video_support |=
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* ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
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*}
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*/
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} else {
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status = acpi_bus_get_device(graphics_handle, &tmp_dev);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
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return 0;
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}
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acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
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ACPI_UINT32_MAX, find_video, NULL,
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&caps, NULL);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
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graphics_handle ? caps : acpi_video_support,
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graphics_handle ? "on device " : "in general",
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graphics_handle ? acpi_device_bid(tmp_dev) : ""));
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return caps;
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}
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EXPORT_SYMBOL(acpi_video_get_capabilities);
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/* Returns true if video.ko can do backlight switching */
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int acpi_video_backlight_support(void)
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{
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/*
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* We must check whether the ACPI graphics device is physically plugged
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* in. Therefore this must be called after binding PCI and ACPI devices
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*/
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if (!acpi_video_caps_checked)
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acpi_video_get_capabilities(NULL);
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/* First check for boot param -> highest prio */
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if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
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return 0;
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else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
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return 1;
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/* Then check for DMI blacklist -> second highest prio */
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if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
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return 0;
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else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
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return 1;
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/* Then go the default way */
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return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
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}
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EXPORT_SYMBOL(acpi_video_backlight_support);
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/*
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* Use acpi_backlight=vendor/video to force that backlight switching
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* is processed by vendor specific acpi drivers or video.ko driver.
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*/
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static int __init acpi_backlight(char *str)
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{
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if (str == NULL || *str == '\0')
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return 1;
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else {
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if (!strcmp("vendor", str))
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acpi_video_support |=
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ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
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if (!strcmp("video", str))
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acpi_video_support |=
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ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
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}
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return 1;
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}
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__setup("acpi_backlight=", acpi_backlight);
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