i2c: hisi: Optimized the value setting of maxwrite limit to fifo depth - 1

maillist inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I92EM3

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git/commit/?h=i2c/i2c-host&id=69dc3880100288972fe341c2c59c40fdecf511f5



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The driver finishes a write cycle by read the fifo tx full status
or write limit decrease to 0. The driver starts to write data to
the FIFO after the I2C FIFO almost empty interrupt is reported.
The threshold for FIFO almost empty interrupt is that the amount
of data in the FIFO is less than or equal to 1.
Reduce write maxwrite to the fifo depth - aempty interrupt
threshold. Limiting the number of data to be written at a time
to remaining fifo capacity.

Signed-off-by: Devyn Liu <liudingyuan@huawei.com>
Reviewed-by: Yicong Yang <yangyicong@hisilicon.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
(cherry picked from commit 80c5f30a)