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eb0d565514Piyush Patle <piyushpatle228@gmail.com> says:
The Tegra210 ADX and AMX drivers both keep their "Byte Map N" ALSA
control state as a byte-packed u32 map[] array along with a separate
byte_mask[] bitmap. This is because the control range exposed to
userspace is [0, 256], where 256 is the "disabled" sentinel and
does not fit in a byte, so the two arrays have to be cross-checked
on every get()/put().
This series stores each slot as a u16 holding the user-visible
value directly, turning get_byte_map() into a direct return and
put_byte_map() into a compare-and-store. The hardware-facing packed
RAM word and the IN_BYTE_EN / OUT_BYTE_EN enable masks are computed
on the fly inside each write_map_ram() callback, which is the only
place that needs to know the hardware layout. The byte_mask[] field
is kept in the driver struct but allocated dynamically in probe()
using devm_kcalloc() with soc_data->byte_mask_size, and zeroed +
recomputed on each write_map_ram() call.
There is no userspace-visible ABI change. Control declarations,
ranges, initial values and handling of out-of-range writes is
preserved by treating values outside [0, 255] as disabled (256),
matching previous behavior. As a side effect each patch also fixes
a latent bug in put_byte_map() where an enabled-to-enabled value
change was not persisted.
The packed RAM word construction is also updated to ensure the shift
operates on a u32 value, avoiding potential undefined behavior due
to signed integer promotion.
Addresses TODO comments left in tegra210_{adx,amx}_get_byte_map().
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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