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Move the DSB buffer handling to the display parent interface, making
display more independent of i915 and xe driver implementations.
Since the DSB parent interface is only called from intel_dsb.c, add the
wrappers there with smaller visibility instead of the usual
intel_parent.[ch], and using struct intel_dsb as the context parameter
for convenience.
Unfortunately, memset() being a macro in linux/fortify-string.h, we
can't use that as the function pointer name. dsb->memset() would be
using the macro and leading to build failures. Therefore, use .fill()
for the memset() functionality.
v2: s/memset/fill/
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/df117c862a6d34dae340e4a85c2482b4e29c8884.1768923917.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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