linux-kernel - Re: [PATCH V14 3/5] i2c: tegra: Add DMA support

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Message-ID: <5483b9d5-816f-3969-2d1e-9712d93dd0a6@gmail.com>
Date:   Thu, 7 Feb 2019 21:24:11 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com,
        mkarthik@...dia.com, smohammed@...dia.com, talho@...dia.com
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [PATCH V14 3/5] i2c: tegra: Add DMA support

06.02.2019 22:16, Sowjanya Komatineni пишет:

> +		if (i2c_dev->msg_read && i2c_dev->msg_err == I2C_ERR_NONE) {
> +			dma_sync_single_for_cpu(i2c_dev->dev,
> +						i2c_dev->dma_phys,
> +						xfer_size,
> +						DMA_FROM_DEVICE);
> +			memcpy(i2c_dev->msg_buf, i2c_dev->dma_buf,
> +			       msg->len);
> +		}
> +
> +		if (i2c_dev->msg_err != I2C_ERR_NONE) {
> +			dmaengine_synchronize(i2c_dev->msg_read ?
> +					      i2c_dev->rx_dma_chan :
> +					      i2c_dev->tx_dma_chan);
> +		}

Minor nit: parentheses are not really around the dmaengine_synchronize()