drm/mgag200: Split up connector's mode_valid helper

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Split up the connector's mode_valid helper into a simple-pipe and a
mode-config helper. The simple-pipe helper tests for display-size
limits while the mode-config helper tests for memory-bandwidth limits.

Also add the mgag200_ prefix to mga_vga_calculate_mode_bandwidth() and
comment on the function's purpose.

The memory-bandwidth tests assume that the display uses 4 bytes per
pixel. The first models of G200SE-A only had 1.75 MiB of VRAM, which
limits these devices to 640x480-32.

v2:
	* note the memory constraints on early G200SE-A

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220516134343.6085-8-tzimmermann@suse.de

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This commit is contained in:

Thomas Zimmermann 2022-05-16 15:43:43 +02:00

parent 69340e529a

commit 475e2b970c

1 changed files with 69 additions and 77 deletions

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drivers/gpu/drm/mgag200/mgag200_mode.c

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