linux-kernel - Re: [PATCH v2] i2c: rcar: add SMBus block read support

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Date:   Tue, 5 Apr 2022 11:43:29 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Eugeniu Rosca <erosca@...adit-jv.com>
Cc:     Andrew Gabbasov <andrew_gabbasov@...tor.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-renesas-soc@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bhuvanesh Surachari <bhuvanesh_surachari@...tor.com>,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH v2] i2c: rcar: add SMBus block read support

Hi Eugeniu,

> The idea was to push it to LKML, once/after you are happy with it.

I see.

> Thanks for the precious feedback. We've requested Renesas to revert the
> obsolete BSP commit, based on your recommendation.

Thank you!

> In general, the Renesas kernel always carries a set of patches with
> non-mainlined changes, Fortunately, for i2c specifically (as opposed
> to other subsystems), it is narrow enough to not raise major concerns:

Well, yes, that shows that I am mostly successful with reporting back to
the BSP team :D But some are still missing, as you can see.

> $ git log --oneline v5.10.41..rcar-5.1.2 -- drivers/i2c/busses/i2c-rcar.c
> 6745303b2bfa i2c: rcar: Add support for r8a77961 (R-Car M3-W+)

Can be dropped: "Driver matches against family-specific compatible
value, which has always been present in upstream DTS"

> 3422d3131700 i2c: rcar: Support the suspend/resume

Already upstream: "18569fa89a4db9ed6b5181624788a1574a9b6ed7 # i2c: rcar:
add suspend/resume support"

> 5680e77f2427 i2c: rcar: Tidy up the register order for hardware specification ver1.00.

Relevant parts upstream: "e7f4264821a4ee07775f3775f8530cfa9a6d4b5d #
i2c: rcar: enable interrupts before starting transfer"

Other parts can be dropped.

> 41394ab7420f i2c: rcar: Fix I2C DMA transmission by setting sequence

Upstream: "94e290b0e9a6c360a5660c480c1ba996d892c650 # i2c: rcar: wait
for data empty before starting DMA"

> Thank you for the review comments. We are still working on a cleaner
> solution. In case it comes from you first, we are very much keen to
> give it a try on the target and report the results.

I have a cleaner solution quite ready. Give me another hour for testing
before I send it out.

All the best,

   Wolfram


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