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Date:   Mon, 18 Feb 2019 09:34:38 +0000
From:   Jon Hunter <>
To:     Thierry Reding <>,
        Sowjanya Komatineni <>
CC:     <>, <>,
        <>, <>,
Subject: Re: [PATCH V1] i2c: tegra: fix tegra186 hw supported features

On 18/02/2019 08:42, Thierry Reding wrote:
> On Sat, Feb 16, 2019 at 08:33:07AM -0800, Sowjanya Komatineni wrote:
>> Tegra186 does not support multi-master mode and also there is no
>> master fifo control register.
>> This patch fixes supported features of Tegra186 and prevents
>> crashing during boot as master fifo control register are not
>> present on Tegra186 and prior.
>> Signed-off-by: Sowjanya Komatineni <>
>> ---
>>  drivers/i2c/busses/i2c-tegra.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
> We really should've caught this earlier. Jon, let's think about ways to
> make it easier to catch these things in the future on our test system.

Indeed. This has fixed the boot regression I was seeing over the weekend
on -next for Tegra186. However, I am bit confused here, because when I
look at the Tegra186 TRM it states that the I2C supports multi-master
mode which disagrees with this patch. Furthermore, it seems odd that
Tegra210 and Tegra194 would support multi-master mode but Tegra186 does
not. So is this really correct?



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