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The DRM helper drm_fb_build_fourcc_list() creates a list of color
formats for primary planes of the generic drivers. Simplify the helper:
- It used to mix and filter native and emulated formats as provided
by the driver. Now the only emulated format is XRGB8888, which is
required as fallback by legacy software. Drop support for emulating
any other formats.
- Also convert alpha formats to their non-alpha counterparts. Generic
drivers don't support primary planes with alpha formats and some
DTs incorrectly advertise alpha channels for non-alpha hardware. So
only export non-alpha formats for primary planes.
With the simplified helper, scrap format lists of the affected generic
drivers. All they need is the firmware buffer's native format, from which
the helper creates the list of color formats.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230102112927.26565-13-tzimmermann@suse.de
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