drm/ast: Acquire I/O-register lock in DDC code

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The modeset lock protects the DDC code from concurrent modeset
operations, which use the same registers. Move that code from the
connector helpers into the DDC helpers .pre_xfer() and .post_xfer().

Both, .pre_xfer() and .post_xfer(), enclose the transfer of data blocks
over the I2C channel in the internal I2C function bit_xfer(). Both
calls are executed unconditionally if present. Invoking DDC transfers
from any where within the driver now takes the lock.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Link: https://patchwork.freedesktop.org/patch/msgid/20240325200855.21150-11-tzimmermann@suse.de

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This commit is contained in:

Thomas Zimmermann 2024-03-25 21:06:55 +01:00

parent 660ed6ba8f

commit dfff99cb56

2 changed files with 28 additions and 26 deletions

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24

drivers/gpu/drm/ast/ast_ddc.c

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30

drivers/gpu/drm/ast/ast_mode.c

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