linux-kernel - Re: [PATCH 02/19] mmc: mmci: merge qcom dml feature into mmci dma

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Message-ID: <CAPDyKFqqj8muP4r2U8rB9rf7f3oB_US+R-oA-PxE26KYxx-j3g@mail.gmail.com>
Date:   Mon, 30 Jul 2018 17:15:14 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Ludovic BARRE <ludovic.barre@...com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Gerald Baeza <gerald.baeza@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH 02/19] mmc: mmci: merge qcom dml feature into mmci dma

On 13 July 2018 at 15:08, Ludovic BARRE <ludovic.barre@...com> wrote:
>
>
> On 07/13/2018 01:17 PM, Ulf Hansson wrote:
>>
>> On 11 July 2018 at 17:19, Ludovic BARRE <ludovic.barre@...com> wrote:
>>>
>>>
>>>
>>> On 07/05/2018 05:26 PM, Ulf Hansson wrote:
>>>>
>>>>
>>>> On 12 June 2018 at 15:14, Ludovic Barre <ludovic.Barre@...com> wrote:
>>>>>
>>>>>
>>>>> From: Ludovic Barre <ludovic.barre@...com>
>>>>>
>>>>> This patch integrates qcom dml feature into mmci_dma file.
>>>>> Qualcomm Data Mover lite/local is already a variant of mmci dmaengine.
>>>>>
>>>>> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
>>>>> ---
>>>>>    drivers/mmc/host/Makefile        |   1 -
>>>>>    drivers/mmc/host/mmci.c          |   1 -
>>>>>    drivers/mmc/host/mmci.h          |  35 ++++++++
>>>>>    drivers/mmc/host/mmci_dma.c      | 135 ++++++++++++++++++++++++++++-
>>>>>    drivers/mmc/host/mmci_qcom_dml.c | 177
>>>>> ---------------------------------------
>>>>>    drivers/mmc/host/mmci_qcom_dml.h |  31 -------
>>>>>    6 files changed, 169 insertions(+), 211 deletions(-)
>>>>>    delete mode 100644 drivers/mmc/host/mmci_qcom_dml.c
>>>>>    delete mode 100644 drivers/mmc/host/mmci_qcom_dml.h
>>>>
>>>>
>>>>
>>>> No, this is not the way to go. Instead I I think there are two options.
>>>>
>>>> 1) Keep mmci_qcom_dml.c|h and thus add new files for the stm32 dma
>>>> variant.
>>>>
>>>> 2) Start by renaming mmci_qcom_dml.* to mmc_dma.* and then in the next
>>>> step add the code for stm32 dma into the renamed files.
>>>>
>>>> I guess if there is some overlap in functionality, 2) may be best as
>>>> it could easier avoid open coding. However, I am fine with whatever
>>>> option and I expect that you knows what is best.
>>>
>>>
>>>
>>> After patch 01 & 05 comments:
>>> I will try to define a mmci_ops which contain some functions pointer
>>> called by mmci.c (core).
>>> A variant defines its mmci_ops.
>>> where do you define the specific function:
>>> -in a single file, mmci-ops.c or other (for the name, I'm not inspirated)
>>> -or in specific file for each variant mmci-qcom.c or mmci-stm32.c
>>>
>>> following the comment (above), I think we define a single file?
>>
>>
>> If I understand the question, the problem is how we should assign the
>> mmc host ops, which corresponds to the probed variant data!?
>>
>> I took a stub at it and posted two patches which I think you should be
>> able to build upon. Please have a look.
>
>
> I review your patch on mmci_host_ops and init, I agree with your series,
> I was going in the same direction.
> The comment above was on file organization, what do you prefer?
> -a single file with: all callback and all mmci_host_ops of each variant
> -or each variant in specific file (like sdhci): mmci-qcom.c | mmci-stm32.c

The latter seems better.

Kind regards
Uffe