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

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Message-ID: <153742048814.119890.14655726482695872149@swboyd.mtv.corp.google.com>
Date:   Wed, 19 Sep 2018 22:14:48 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Wolfram Sang <wsa@...-dreams.de>
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

Quoting Wolfram Sang (2018-09-19 13:45:28)
> 
> > 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 :)
> 

Ok great. I haven't synced to the latest stuff. I'll resend this
tomorrow when I test again.