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drm/todo: Update backlight todo

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Basic helpers have been extracted, now there's a pile more todo still
across the entire tree.

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190614203615.12639-57-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2019-06-14 22:36:12 +02:00
parent 9dfed70130
commit 3c745e0b5d
1 changed files with 13 additions and 14 deletions
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27
Documentation/gpu/todo.rst
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@ -433,6 +433,19 @@ fit the available time.
Contact: Daniel Vetter
Backlight Refactoring
---------------------
Backlight drivers have a triple enable/disable state, which is a bit overkill.
Plan to fix this:
1. Roll out backlight_enable() and backlight_disable() helpers everywhere. This
has started already.
2. In all, only look at one of the three status bits set by the above helpers.
3. Remove the other two status bits.
Contact: Daniel Vetter
Driver Specific
===============
@ -442,20 +455,6 @@ tinydrm
Tinydrm is the helper driver for really simple fb drivers. The goal is to make
those drivers as simple as possible, so lots of room for refactoring:
- backlight helpers, probably best to put them into a new drm_backlight.c.
This is because drivers/video is de-facto unmaintained. We could also
move drivers/video/backlight to drivers/gpu/backlight and take it all
over within drm-misc, but that's more work. Backlight helpers require a fair
bit of reworking and refactoring. A simple example is the enabling of a backlight.
Tinydrm has helpers for this. It would be good if other drivers can also use the
helper. However, there are various cases we need to consider i.e different
drivers seem to have different ways of enabling/disabling a backlight.
We also need to consider the backlight drivers (like gpio_backlight). The situation
is further complicated by the fact that the backlight is tied to fbdev
via fb_notifier_callback() which has complicated logic. For further details, refer
to the following discussion thread:
https://groups.google.com/forum/#!topic/outreachy-kernel/8rBe30lwtdA
- spi helpers, probably best put into spi core/helper code. Thierry said
the spi maintainer is fast&reactive, so shouldn't be a big issue.