linux-kernel - Re: [PATCH v3] i2c: tegra: Share same DMA channel for RX and TX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <db870e74-9d97-740a-9829-5fafc0bb0559@nvidia.com>
Date:   Wed, 22 Mar 2023 11:07:15 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Akhil R <akhilrajeev@...dia.com>, christian.koenig@....com,
        digetx@...il.com, ldewangan@...dia.com, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        sumit.semwal@...aro.org, thierry.reding@...il.com, wsa@...nel.org
Subject: Re: [PATCH v3] i2c: tegra: Share same DMA channel for RX and TX


On 22/03/2023 10:24, Akhil R wrote:
> Allocate only one DMA channel for I2C and share it for both TX and RX
> instead of using two different DMA hardware channels with the same
> slave ID. Since I2C supports only half duplex, there is no impact on
> perf with this.
> 
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>

Just to confirm. This impacts all Tegra devices from Tegra20 to the 
latest. Does this work for all Tegra and the different DMA controllers 
that they have?

Thanks
Jon

-- 
nvpublic