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

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Date:   Tue, 13 Mar 2018 15:09:00 -0600
From:   "Christ, Austin" <austinwc@...eaurora.org>
To:     Abhishek Sahu <absahu@...eaurora.org>,
        Andy Gross <andy.gross@...aro.org>,
        Wolfram Sang <wsa@...-dreams.de>
Cc:     David Brown <david.brown@...aro.org>,
        Sricharan R <sricharan@...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

I've tested this v2 series on Centriq 2400. Looks good to me.

Reviewed-by: Austin Christ <austinwc@...eaurora.org>

On 3/12/2018 7:14 AM, 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
> 
>   drivers/i2c/busses/i2c-qup.c | 1507 ++++++++++++++++++++++++------------------
>   1 file changed, 880 insertions(+), 627 deletions(-)
> 

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