From: Viken Dadhaniya <quic_vdadhani@quicinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: <andersson@kernel.org>, <konrad.dybcio@linaro.org>,
<andi.shyti@kernel.org>, <linux-arm-msm@vger.kernel.org>,
<linux-i2c@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<vkoul@kernel.org>, <quic_bjorande@quicinc.com>,
<manivannan.sadhasivam@linaro.org>, <quic_msavaliy@quicinc.com>,
<quic_vtanuku@quicinc.com>
Subject: Re: [V2] i2c: i2c-qcom-geni: Correct I2C TRE sequence
Date: Thu, 1 Feb 2024 15:49:52 +0530 [thread overview]
Message-ID: <9d895aca-eeb6-4530-bda9-c4832c777c5d@quicinc.com> (raw)
In-Reply-To: <CAA8EJpr_KXsjTUYha7OVg4HLLJLqMRvJun9DnMkBFvq3R2nk=Q@mail.gmail.com>
On 1/30/2024 5:19 AM, Dmitry Baryshkov wrote:
> On Mon, 29 Jan 2024 at 08:10, Viken Dadhaniya <quic_vdadhani@quicinc.com> wrote:
>>
>> For i2c read operation, we are getting gsi mode timeout due
>> to malformed TRE(Transfer Ring Element). Currently we are
>> configuring incorrect TRE sequence in gpi driver
>> (drivers/dma/qcom/gpi.c) as below
>>
>> - Sets up CONFIG
>> - Sets up DMA tre
>> - Sets up GO tre
>>
>> As per HPG(Hardware programming guide), We should configure TREs in below
>> sequence for any i2c transfer
>>
>> - Sets up CONFIG tre
>> - Sets up GO tre
>> - Sets up DMA tre
>
> It is not clear how this is relevant and/or affected by swapping
> I2C_WRITE and I2C_READ gpi calls.
>
Submitted V3 with proper commit log.
>>
>> For only write operation or write followed by read operation,
>> existing software sequence is correct.
>>
>> for only read operation, TRE sequence need to be corrected.
>> Hence, we have changed the sequence to submit GO tre before DMA tre.
>>
>> Tested covering i2c read/write transfer on QCM6490 RB3 board.
>
> Please read Documentation/process/submitting-patches.rst, understand
> it and write a proper commit message.
>
>>
>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com>
>> Fixes: commit d8703554f4de ("i2c: qcom-geni: Add support for GPI DMA")
>
> As it was pointed out, this line shows ignorance of the mentioned file
> and of the existing community practices.
>
Updated fixes tag in V3.
>> ---
>> v1 -> v2:
>> - Remove redundant check.
>> - update commit log.
>> - add fix tag.
>> ---
>> ---
>> drivers/i2c/busses/i2c-qcom-geni.c | 14 +++++++-------
>> 1 file changed, 7 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
>> index 0d2e7171e3a6..da94df466e83 100644
>> --- a/drivers/i2c/busses/i2c-qcom-geni.c
>> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
>> @@ -613,20 +613,20 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
>>
>> peripheral.addr = msgs[i].addr;
>>
>> + ret = geni_i2c_gpi(gi2c, &msgs[i], &config,
>> + &tx_addr, &tx_buf, I2C_WRITE, gi2c->tx_c);
>> + if (ret)
>> + goto err;
>> +
>> if (msgs[i].flags & I2C_M_RD) {
>> ret = geni_i2c_gpi(gi2c, &msgs[i], &config,
>> &rx_addr, &rx_buf, I2C_READ, gi2c->rx_c);
>> if (ret)
>> goto err;
>> - }
>> -
>> - ret = geni_i2c_gpi(gi2c, &msgs[i], &config,
>> - &tx_addr, &tx_buf, I2C_WRITE, gi2c->tx_c);
>> - if (ret)
>> - goto err;
>>
>> - if (msgs[i].flags & I2C_M_RD)
>> dma_async_issue_pending(gi2c->rx_c);
>> + }
>> +
>> dma_async_issue_pending(gi2c->tx_c);
>>
>> timeout = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
>> --
>> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
>> of Code Aurora Forum, hosted by The Linux Foundation
>>
>>
>
>
next prev parent reply other threads:[~2024-02-01 10:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-29 6:10 [V2] i2c: i2c-qcom-geni: Correct I2C TRE sequence Viken Dadhaniya
2024-01-29 23:24 ` Andi Shyti
2024-01-30 11:32 ` Bryan O'Donoghue
2024-02-01 10:17 ` Viken Dadhaniya
2024-01-29 23:49 ` Dmitry Baryshkov
2024-01-30 9:42 ` Andi Shyti
2024-02-01 10:21 ` Viken Dadhaniya
2024-02-01 10:19 ` Viken Dadhaniya [this message]
2024-01-30 15:24 ` Bryan O'Donoghue
2024-02-01 10:23 ` Viken Dadhaniya
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