linux-kernel - Re: [PATCH 0/2] i2c: rcar: add support for Gen4 devices

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Date:   Sat, 16 Sep 2023 09:15:55 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 0/2] i2c: rcar: add support for Gen4 devices

Hi Shimoda-san,

> I tested the branch on the Spider, and then the i2c cannot be probed with the following errors:
> -----
> # dmesg | grep i2c
> [    1.528773] i2c_dev: i2c /dev entries driver
> [    1.533572] i2c-rcar e6500000.i2c: clk 395647/400000(133333333), round 46, CDF: 6 SMD 20 SCL gran 27

These values look good and match the values from Falcon.

> [    1.554646] i2c-rcar e6500000.i2c: request_channel failed for tx (-517)
> [    1.561487] i2c-rcar e6500000.i2c: request_channel failed for tx (-517)
> [    1.568133] i2c-rcar e6500000.i2c: request_channel failed for rx (-517)

-EPROBE_DEFER when requesting the DMA channel? This is weird, at first
glimpse this seems unrelated to my series. But you say v6.6-rc1 works
fine. Strange.

> I checked that the v6.6-rc1 (commit 0bb80ecc33a8) could worked correctly.
> JFYI, I pasted whole log at the end of this email. Should I do git bisect to find
> a bad commit on the branch?

Very kind of you but I think this is not needed. There is a Spider in
Kieran's lab and I will try to reproduce the issue there myself. If that
doesn't work, I'll come back to you.

Thank you for the report!

All the best,

   Wolfram


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