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authorHans de Goede <hdegoede@redhat.com>2021-10-05 23:23:14 +0300
committerHans de Goede <hdegoede@redhat.com>2021-10-14 14:12:21 +0300
commita1a98689301b9af0313e4c1ba44558e8b67ff76e (patch)
tree90193340cfdbb1f68176948c2ce9f7afade41253 /Documentation/gpu
parent107fe904302092c683cf5462b4af3cb3cfa40998 (diff)
downloadlinux-a1a98689301b9af0313e4c1ba44558e8b67ff76e.tar.xz
drm: Add privacy-screen class (v4)
On some new laptops the LCD panel has a builtin electronic privacy-screen. We want to export this functionality as a property on the drm connector object. But often this functionality is not exposed on the GPU but on some other (ACPI) device. This commit adds a privacy-screen class allowing the driver for these other devices to register themselves as a privacy-screen provider; and allowing the drm/kms code to get a privacy-screen provider associated with a specific GPU/connector combo. Changes in v2: - Make CONFIG_DRM_PRIVACY_SCREEN a bool which controls if the drm_privacy code gets built as part of the main drm module rather then making it a tristate which builds its own module. - Add a #if IS_ENABLED(CONFIG_DRM_PRIVACY_SCREEN) check to drm_privacy_screen_consumer.h and define stubs when the check fails. Together these 2 changes fix several dependency issues. - Remove module related code now that this is part of the main drm.ko - Use drm_class as class for the privacy-screen devices instead of adding a separate class for this Changes in v3: - Make the static inline drm_privacy_screen_get_state() stub set sw_state and hw_state to PRIVACY_SCREEN_DISABLED to squelch an uninitialized variable warning when CONFIG_DRM_PRIVICAY_SCREEN is not set Changes in v4: - Make drm_privacy_screen_set_sw_state() skip calling out to the hw if hw_state == new_sw_state Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211005202322.700909-3-hdegoede@redhat.com
Diffstat (limited to 'Documentation/gpu')
-rw-r--r--Documentation/gpu/drm-kms-helpers.rst15
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
index ec2f65b31930..5bb55ec1b9b5 100644
--- a/Documentation/gpu/drm-kms-helpers.rst
+++ b/Documentation/gpu/drm-kms-helpers.rst
@@ -435,3 +435,18 @@ Legacy CRTC/Modeset Helper Functions Reference
.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
:export:
+
+Privacy-screen class
+====================
+
+.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c
+ :doc: overview
+
+.. kernel-doc:: include/drm/drm_privacy_screen_driver.h
+ :internal:
+
+.. kernel-doc:: include/drm/drm_privacy_screen_machine.h
+ :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c
+ :export: