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The code handling 'alpha_blending_enabled' sysfs file contains WARN_ONs
in case the feature is not supported on the current platform. Even
though only root can write to the file, anyone can read it, thus causing
the kernel to get tainted and printing an ugly warning.
Instead of having WARN_ONs, return a proper error if the feature is not
supported.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reported-by: Russell King - ARM Linux <linux@arm.linux.org.uk>
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We currently have two steps in panel initialization and startup: probing
and enabling. After the panel has been probed, it's ready and can be
configured and later enabled.
This model is not enough with more complex display pipelines, where we
may have, for example, two panels, of which only one can be used at a
time, connected to the same video output.
To support that kind of scenarios, we need to add new step to the
initialization: connect.
This patch adds support for connecting and disconnecting panels. After
probe, but before connect, no panel ops should be called. When the
connect is called, a proper video pipeline is established, and the panel
is ready for use. If some part in the video pipeline is already
connected (by some other panel), the connect call fails.
One key difference with the old style setup is that connect() handles
also connecting to the overlay manager. This means that the omapfb (or
omapdrm) no longer needs to figure out which overlay manager to use, but
it can just call connect() on the panel, and the proper overlay manager
is connected by omapdss.
This also allows us to add back the support for dynamic switching
between two exclusive panels. However, the current panel device model is
not changed to support this, as the new device model is implemented in
the following patches and the old model will be removed. The new device
model supports dynamic switching.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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Split the function that creates overlay manager structs into two: one
that creates just the structs, and one that creates the sysfs files for
the manager.
This will help us use the overlay manager structs with omapdrm in the
following patches, while still leaving the sysfs files out.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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Add two helper functions that can be used to find either the DSS output
or the overlay manager that is connected to the given display.
This hides how the output and the manager are actually connected, making
it easier to change the connections in the future.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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The display sysfs attribute's store function needs to be changed with the
introduction of outputs.
The DSS driver ensures that there is one display per output, and that a
registered omap_dss_device will have an output connected to it. The display
sysfs store function unsets the current output connected to the manager, and
sets it with the output connected to the new display. If the new display doesn't
have an output for some reason, we just bail out. The function doesn't set/unset
output->device links. These remain the same as when the omap_dss_device was
registered.
Signed-off-by: Archit Taneja <archit@ti.com>
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With the introduction of output entities, managers will now connect to outputs.
Create helper ops for overlays and managers named get_device. This will abstract
away the information on how to get the device from an overlay or an overlay
manager. The get_device ops currently retrieve the output via a
ovl->manager->device reference. This will be later replaced by
ovl->manager->output->device references.
Signed-off-by: Archit Taneja <archit@ti.com>
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Separate sysfs code for managers to a separate file. This is a bit
cleaner, and will allow us later to easily switch off the sysfs support
via Kconfig option.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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