linux-kernel - Re: [PATCH v2 00/13] Major code reorganization to make all i2c transfers working

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Date:   Mon, 26 Mar 2018 10:11:39 +0530
From:   Abhishek Sahu <absahu@...eaurora.org>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Sricharan R <sricharan@...eaurora.org>,
        Austin Christ <austinwc@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/13] Major code reorganization to make all i2c
 transfers working

On 2018-03-24 17:52, Wolfram Sang wrote:
> On Mon, Mar 12, 2018 at 06:44:49PM +0530, Abhishek Sahu wrote:
>> * v2:
>> 
>> 1. Address review comments in v1
>> 2. Changed the license to SPDX
>> 3. Changed commit messages for some of the patch having more detail
>> 4. Removed event-based completion and changed transfer completion
>>    detection logic in interrupt handler
>> 5. Removed dma_threshold and blk_mode_threshold from global structure
>> 6. Improved determine mode logic for QUP v2 transfers
>> 7. Fixed function comments
>> 8. Fixed auto build test WARNING ‘idx' may be used uninitialized
>>    in this function
>> 9. Renamed tx/rx_buf to tx/rx_cnt
>> 
>> * v1:
>> 
>> The current driver is failing in following test case
>> 1. Handling of failure cases is not working in long run for BAM
>>    mode. It generates error message “bam-dma-engine 7884000.dma: 
>> Cannot
>>    free busy channel” sometimes.
>> 2. Following I2C transfers are failing
>>    a. Single transfer with multiple read messages
>>    b. Single transfer with multiple read/write message with maximum
>>       allowed length per message (65K) in BAM mode
>>    c. Single transfer with write greater than 32 bytes in QUP v1 and
>>       write greater than 64 bytes in QUP v2 for non-DMA mode.
>> 3. No handling is present for Block/FIFO interrupts. Any non-error
>>    interrupts are being treated as the transfer completion and then
>>    polling is being done for available/free bytes in FIFO.
>> 
>> To fix all these issues, major code changes are required. This patch
>> series fixes all the above issues and makes the driver interrupt based
>> instead of polling based. After these changes, all the mentioned test
>> cases are working properly.
>> 
>> The code changes have been tested for QUP v1 (IPQ8064) and QUP
>> v2 (IPQ8074) with sample application written over i2c-dev.
>> 
>> Abhishek Sahu (13):
>>   i2c: qup: fix copyrights and update to SPDX identifier
>>   i2c: qup: fixed releasing dma without flush operation completion
>>   i2c: qup: minor code reorganization for use_dma
>>   i2c: qup: remove redundant variables for BAM SG count
>>   i2c: qup: schedule EOT and FLUSH tags at the end of transfer
>>   i2c: qup: fix the transfer length for BAM RX EOT FLUSH tags
>>   i2c: qup: proper error handling for i2c error in BAM mode
>>   i2c: qup: use the complete transfer length to choose DMA mode
>>   i2c: qup: change completion timeout according to transfer length
>>   i2c: qup: fix buffer overflow for multiple msg of maximum xfer len
>>   i2c: qup: send NACK for last read sub transfers
>>   i2c: qup: reorganization of driver code to remove polling for qup v1
>>   i2c: qup: reorganization of driver code to remove polling for qup v2
> 
> Applied to for-next, thanks! Also thanks to the reviewers!

  Thanks Wolfram for your help in getting this big
  patch series applied to for-next.

  Thanks to Andy, Sricharan, Austin and other reviewers for
  reviewing/testing the patches.

  Regards,
  Abhishek