linux-kernel - RE: [RESEND PATCH] usb: chipidea: Configure DMA properties and ops from DT

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Message-ID: <AM4PR0401MB19211F31D8A4B0676DA2EBA5F5D70@AM4PR0401MB1921.eurprd04.prod.outlook.com>
Date:   Sat, 22 Oct 2016 06:22:38 +0000
From:   Sriram Dash <sriram.dash@....com>
To:     Stephen Boyd <sboyd@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     Peter Chen <peter.chen@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Suresh Gupta <suresh.gupta@....com>, Leo Li <pku.leo@...il.com>
Subject: RE: [RESEND PATCH] usb: chipidea: Configure DMA properties and ops
 from DT

>From: Stephen Boyd [mailto:sboyd@...eaurora.org]
>On 10/21, Bjorn Andersson wrote:
>> hcd_alloc_coherent() and usb_alloc_coherent() ends up allocating
>> coherent memory on behalf of ci_hdrc driver. But as the ci_hdrc is
>> instantiated manually it will not have any dma_mem or dma_ops
>> assigned, which makes the
>> dma_alloc_coherent() fail on some platforms (e.g. arm64). This patch
>> solves this by assigning the dma_mem and dma_ops based on the parent's
>> DeviceTree node.
>>
>> Cc: Stephen Boyd <sboyd@...eaurora.org>
>> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>> ---
>>
>> Hi Peter,
>>
>> After (once more) debugging why USB doesn't work up on the 64-bit
>> Qualcomm systems I realized that we never concluded on this patch.
>> Unfortunately I can't find it in my mailbox either, so resending it to restart the
>discussion.
>>
>
>I thought we were going to go down the route that Arnd has been pushing[1]? That
>should work, but I haven't tried it yet and there are some more fixes on top from
>Sriram. I think Sriram is taking over the patch now?
>

Yes Stephen. I am incorporating the idea from Arnd and working on those patches.

Regards,
Sriram

>[1] https://patchwork.kernel.org/patch/9319527/
>
>--
>Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
>Foundation Collaborative Project