On Tue, 12 May 2020 10:02:12 +0200 Hans de Goede hdegoede@redhat.com wrote:
Hi,
On 5/12/20 9:49 AM, Pekka Paalanen wrote:
On Mon, 11 May 2020 19:47:24 +0200 Hans de Goede hdegoede@redhat.com wrote:
From: Rajat Jain rajatja@google.com
Add support for generic electronic privacy screen properties, that can be added by systems that have an integrated EPS.
Changes in v2 (Hans de Goede)
- Create 2 properties, "privacy-screen sw-state" and "privacy-screen hw-state", to deal with devices where the OS might be locked out of making state changes
- Write kerneldoc explaining how the 2 properties work together, what happens when changes to the state are made outside of the DRM code's control, etc.
Signed-off-by: Rajat Jain rajatja@google.com Co-authored-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Hans de Goede hdegoede@redhat.com
Documentation/gpu/drm-kms.rst | 2 + drivers/gpu/drm/drm_atomic_uapi.c | 6 ++ drivers/gpu/drm/drm_connector.c | 100 ++++++++++++++++++++++++++++++ include/drm/drm_connector.h | 50 +++++++++++++++ 4 files changed, 158 insertions(+)
...
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 644f0ad10671..01360edc2376 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -1186,6 +1186,45 @@ static const struct drm_prop_enum_list dp_colorspaces[] = {
- can also expose this property to external outputs, in which case they
- must support "None", which should be the default (since external screens
- have a built-in scaler).
- privacy-screen sw-state, privacy-screen hw-state:
- These 2 optional properties can be used to query the state of the
- electronic privacy screen that is available on some displays; and in
- some cases also control the state. If a driver implements these
- properties then both properties must be present.
- "privacy-screen hw-state" is read-only and reflects the actual state
- of the privacy-screen, possible values: "Enabled", "Disabled,
- "Enabled, locked", "Disabled, locked". The locked states indicate
- that the state cannot be changed through the DRM API. E.g. there
- might be devices where the firmware-setup options, or a hardware
- slider-switch, offer always on / off modes.
- "privacy-screen sw-state" can be set to change the privacy-screen state
- when not locked. In this case the driver must update the hw-state
- property to reflect the new state on completion of the commit of the
- sw-state property. Setting the sw-state property when the hw-state is
- locked must be interpreted by the driver as a request to change the
- state to the set state when the hw-state becomes unlocked. E.g. if
- "privacy-screen hw-state" is "Enabled, locked" and the sw-state
- gets set to "Disabled" followed by the user unlocking the state by
- changing the slider-switch position, then the driver must set the
- state to "Disabled" upon receiving the unlock event.
- In some cases the privacy-screen state might change outside of control
- of the DRM code. E.g. there might be a firmware handled hotkey which
- toggles the state, or the state might be changed through another
Hi,
in the above three lines, I'd use the term "hardware state" instead of just "state" to be explicit. Or should it be "physical state" since "hardware state" might be confused with "hw-state" property state?
Maybe "actual state"? That is what is used a few lines higher:
'"privacy-screen hw-state" is read-only and reflects the actual state'
And you use it yourself to describe what we want below:
I don't mind as long as it's unambiguous and distinguishes explicitly between actual and the two property states.
So since you and I both naturally described it as "actual state" without thinking too much what we where writing at the time (I guess that applies to your use too), "actual state" seems a good fit ?
Sure!
Thanks, pq