Re: [PATCH 2/4] i2c: rcar: optimize cacheline to minimize HW race condition

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Subject: Re: [PATCH 2/4] i2c: rcar: optimize cacheline to minimize HW race condition
From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 28 Dec 2020 13:55:07 +0100
Cc: Linux I2C <linux-i2c@xxxxxxxxxxxxxxx>, Linux-Renesas <linux-renesas-soc@xxxxxxxxxxxxxxx>, Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxx>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
In-reply-to: <CAMuHMdV7i28HjfLbrzrJaJw6hB51u=kgmqqYmK_zBETFXumCUg@mail.gmail.com>
Mail-followup-to: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Linux I2C <linux-i2c@xxxxxxxxxxxxxxx>, Linux-Renesas <linux-renesas-soc@xxxxxxxxxxxxxxx>, Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxx>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
References: <20201223172154.34462-1-wsa+renesas@sang-engineering.com> <20201223172154.34462-3-wsa+renesas@sang-engineering.com> <CAMuHMdV7i28HjfLbrzrJaJw6hB51u=kgmqqYmK_zBETFXumCUg@mail.gmail.com>

> But if this really can make a difference, IMHO it is still broken

It *is* broken on Gen2, no way around that. We can only minimze the race
best as we can.

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References:
- [PATCH 0/4] i2c: rcar: handle Gen2 and Gen3 V3U quirks better
  - From: Wolfram Sang
- [PATCH 2/4] i2c: rcar: optimize cacheline to minimize HW race condition
  - From: Wolfram Sang
- Re: [PATCH 2/4] i2c: rcar: optimize cacheline to minimize HW race condition
  - From: Geert Uytterhoeven

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