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authorAdrian Ratiu <[email protected]>2020-10-14 23:30:24 +0300
committerMark Brown <[email protected]>2020-10-26 19:54:59 +0000
commit6e1e90ec027509a7e8d4efbd77a65b32b5a8b3ec (patch)
treebd80cbfb9669e608740c11a1d2ed5adb18d1c0e6 /lib/mpi
parent3650b228f83adda7e5ee532e2b90429c03f7b9ec (diff)
regmap: mmio: add config option to allow relaxed MMIO accesses
On some platforms (eg armv7 due to the CONFIG_ARM_DMA_MEM_BUFFERABLE) MMIO R/W operations always add memory barriers which can increase load, decrease battery life or in general reduce performance unnecessarily on devices which access a lot of configuration registers and where ordering does not matter (eg. media accelerators like the Verisilicon / Hantro video decoders). Drivers used to call the relaxed MMIO variants directly but since they are now accessing the MMIO registers via regmaps (to compensate for different VPU HW reg layouts via regmap fields), there is a need for a relaxed API / config to preserve existing behaviour. Cc: Mark Brown <[email protected]> Signed-off-by: Adrian Ratiu <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Mark Brown <[email protected]>
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