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

[Peng Ma]

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 KozÅowski <k.kozlowski.k@xxxxxxxxx>
>Sent: 2019å7æ2æ 20:13
>To: Peng Ma <peng.ma@xxxxxxx>; Vinod Koul <vkoul@xxxxxxxxxx>;
>dmaengine@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
>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@xxxxxxx>
>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

Attachment: 0001-dmaengine-fsl-edma-support-little-endian-for-edma-dr.patch
Description: 0001-dmaengine-fsl-edma-support-little-endian-for-edma-dr.patch