linux-kernel - RE: [EXT] [BUG BISECT] Net boot fails on VF50 after "dmaengine: fsl-edma: support little endian for edma driver"

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Date:   Thu, 4 Jul 2019 02:10:20 +0000
From:   Peng Ma <peng.ma@....com>
To:     Krzysztof Kozłowski <k.kozlowski.k@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Fabio Estevam <fabio.estevam@....com>, Leo Li <leoyang.li@....com>,
        Andy Tang <andy.tang@....com>
Subject: RE: [EXT] [BUG BISECT] Net boot fails on VF50 after "dmaengine:
 fsl-edma: support little endian for edma driver"

Hi Krzysztof,

I am sorry, It is my mistake to forget about VF50 used EDMA IP with little endian.
The Register(CHCFG0 - CHCFG15) of our platform designed as follows:
*-------------------------------------------------------------------------------*
|     Offset   | Big endian Register| Little endian Register|
|---------------------|--------------------------|-----------------------------|
|     0x0     |     CHCFG0    |     CHCFG3      |
|---------------------|--------------------------|-----------------------------|
|     0x1     |     CHCFG1    |     CHCFG2      |
|---------------------|--------------------------|-----------------------------|
|     0x2     |     CHCFG2    |     CHCFG1      |
|---------------------|--------------------------|-----------------------------|
|     0x3     |     CHCFG3    |     CHCFG0      |
|---------------------|--------------------------|-----------------------------|
|     ...      |        ......     |         ......      |
|---------------------|--------------------------|-----------------------------|
|     0xC     |     CHCFG12   |     CHCFG15     |
|---------------------|--------------------------|-----------------------------|
|     0xD     |     CHCFG13   |     CHCFG14     |
|---------------------|--------------------------|-----------------------------|
|     0xE     |     CHCFG14   |     CHCFG13     |
|---------------------|--------------------------|-----------------------------|
|     0xF     |     CHCFG15   |     CHCFG12     |
*-------------------------------------------------------------------------------*

So we need this patch, I make some changes,Please help me to test attatchment on VF50 board,
Thanks.

Best Regards,
Peng
>-----Original Message-----
>From: Krzysztof Kozłowski <k.kozlowski.k@...il.com>
>Sent: 2019年7月2日 20:13
>To: Peng Ma <peng.ma@....com>; Vinod Koul <vkoul@...nel.org>;
>dmaengine@...r.kernel.org; linux-kernel@...r.kernel.org
>Subject: [EXT] [BUG BISECT] Net boot fails on VF50 after "dmaengine:
>fsl-edma: support little endian for edma driver"
>
>Caution: EXT Email
>
>Hi,
>
>Bisect pointed commit:
>commit 002905eca5bedab08bafd9e325bbbb41670c7712
>Author: Peng Ma <peng.ma@....com>
>Date:   Thu Jun 13 10:27:08 2019 +0000
>    dmaengine: fsl-edma: support little endian for edma driver
>
>as a reason of NFSv4 root boot failures. Toradex Colibri VF50 (Cortex
>A5) on Toradex Iris board.
>
>The user-space starts but hangs - a lot of messages are missing or seriously
>delayed.
>
>Please revert the patch of fix it. If needed I can provide more details about test
>system - let me know.
>
>Full log attached.
>
>Best regards,
>Krzysztof

Download attachment "0001-dmaengine-fsl-edma-support-little-endian-for-edma-dr.patch" of type "application/octet-stream" (3060 bytes)