i2c: hisi: Optimized the value setting of maxwrite limit to fifo depth - 1 · Issue #I92EM3 · openEuler/kernel

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.

The driver receives the tx fifo almost empty(aempty) interrupt and
reads the tx_aempty_int_mstat to start a round of data transfer.
The operation of clearing the TX aempty interrupt after completing
a write cycle is added to ensure that the FIFO is truly at almost
empty status when an aempty interrupt is received.
The threshold for fifo almost empty interrupt is defined as 1.

验证方法：读64字节数据，无报错
[root@localhost dev]#                                                                                                               
[root@localhost dev]# i2cdetect -y -r 0                                                                                             
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f                                                                                 
00:                         -- -- -- -- -- -- -- --                                                                                 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --                                                                                 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --                                                                                 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --                                                                                 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --                                                                                 
50: -- -- 52 -- -- -- 56 -- -- -- -- -- -- -- -- --                                                                                 
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --                                                                                 
70: -- -- -- -- -- -- -- --                                                                                                         
[root@localhost dev]#                                                                                                               
[root@localhost dev]#                                                                                                               
[root@localhost dev]#                                                                                                               
[root@localhost dev]# i2ctransfer -y 0 w18@0x52 0x00 0x00 0x00+                                                                     
[root@localhost dev]# 12ctransfer -y 0 w2@0x52 0x00 0x00 r16                                                                        
-bash: 12ctransfer: command not found                                                                                               
[root@localhost dev]# i2ctransfer -y 0 w2@0x52 0x00 0x00 r16                                                                        
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0a 0x0b 0x0c 0x0d 0x0e 0x0f                                                     
[root@localhost dev]# i2ctransfer -y 0 w66@0x52 0x0 0x00 0x0+                                                                       
[root@localhost dev]#  i2ctransfer -y 0 w2@0x52 0x0 0x00 r66                                                                        
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x
1a 0x1b 0x1c 0x1d 0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31 0x32 0x33 0x34
 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b 0x3c 0x3d 0x3e 0x3f 0x00 0x00                                                                   
[root@localhost dev]#                                                                                                               
[root@localhost dev]#

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

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

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