linux-kernel - RE: [PATCH V17 3/6] i2c: tegra: fix maximum transfer size

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Message-ID: <BYAPR12MB339810D394AC0A50934DD5EAC2690@BYAPR12MB3398.namprd12.prod.outlook.com>
Date:   Fri, 8 Feb 2019 18:17:37 +0000
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mantravadi Karthik <mkarthik@...dia.com>,
        Shardar Mohammed <smohammed@...dia.com>,
        Timo Alho <talho@...dia.com>
CC:     "wsa@...-dreams.de" <wsa@...-dreams.de>,
        "peda@...ntia.se" <peda@...ntia.se>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH V17 3/6] i2c: tegra: fix maximum transfer size


> >  static const struct i2c_adapter_quirks tegra194_i2c_quirks = {
> >  	.flags = I2C_AQ_NO_ZERO_LEN,
> > +	.max_write_len = 65535 - I2C_PACKET_HEADER_SIZE,
>
> Ideally it should be SZ_64K - I2C_PACKET_HEADER_SIZE to not miss the one byte, otherwise good to me:
>
> Reviewed-by: Dmitry Osipenko <digetx@...il.com>

With SZ_64K - I2C_PACKET_HEADR_Size, When we compute dma_buf_size = max_write_len + I2C_PACKET_HEADER_SIZE, dma_buf_size will be SZ_64K which is 0x10000 apbdma dma count limit should be < 64K meaning 65535 max is allowed