linux-kernel - Re: [PATCH v4 3/6] i3c: add actual_len in i3c_priv

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Message-ID: <20231130111712.6438de35@xps-13>
Date:   Thu, 30 Nov 2023 11:17:12 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Frank Li <Frank.Li@....com>
Cc:     alexandre.belloni@...tlin.com, conor.culhane@...vaco.com,
        imx@...ts.linux.dev, joe@...ches.com,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
        zbigniew.lukwinski@...ux.intel.com
Subject: Re: [PATCH v4 3/6] i3c: add actual_len in i3c_priv_xfer

Hi Frank,

Frank.Li@....com wrote on Wed, 29 Nov 2023 17:12:22 -0500:

> In MIPI I3C Specification:
> 
> "Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the
> ninth Data bit from Target to Controller is an ACK by the Controller. By
> contrast, in I3C this bit allows the Target to end a Read, and allows the
> Controller to Abort a Read. In SDR terms, the ninth bit of Read data is
> referred to as the T-Bit (for ‘Transition’)"
> 
> I3C allow devices early terminate data transfer. So need "actual_len" field
> to indicate how much get by i3c_priv_xfer.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>

Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>

Thanks,
Miquèl