linux-kernel - Re: [PATCH] i2c: i2c-qcom-geni: Properly handle DMA safe buffers

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Date:   Wed, 19 Sep 2018 22:45:28 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Karthikeyan Ramasubramanian <kramasub@...eaurora.org>,
        Sagar Dharia <sdharia@...eaurora.org>,
        Girish Mahadevan <girishm@...eaurora.org>
Subject: Re: [PATCH] i2c: i2c-qcom-geni: Properly handle DMA safe buffers


> But now when I try to use it I'm not exicted when the buffer is bounced
> but we fail to map the buffer with the DMA APIs. For an I2C_M_RD

Yes, this was reported before and the function to unmap looks different
now as of v4.19-rc2...

> the buffer that we setup. Or we can pass an argument to
> i2c_release_dma_safe_msg_buf() to indicate if we should do the memcpy or
> not?

... exactly like this :)


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