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From: Fabio Estevam <festevam@gmail.com>
To: Stefan Christ <s.christ@phytec.de>
Cc: "barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: Re: [PATCH] mci: imx-esdhc: implement reset quirks for i.MX6 DualLite/Solo
Date: Wed, 11 May 2016 13:05:58 -0300	[thread overview]
Message-ID: <CAOMZO5Dsr4vn8LJwuD-NR11p0vDvADva7ySMBjpwF5jSmST7Rw@mail.gmail.com> (raw)
In-Reply-To: <1462368052-7344-1-git-send-email-s.christ@phytec.de>

Hi Stefan,

On Wed, May 4, 2016 at 10:20 AM, Stefan Christ <s.christ@phytec.de> wrote:
> First of all the reset values of MMC interfaces are differently between
> Quad and DualLite/Solo SoM.
>
>                 Register VEND_SPEC2(0xC8)
>     Quad:       0x0
>     DualLite:   0x00000006
>     default:    0x00000006    (from i.MX6 Reference Manual)
>
> Furthermore the ROM Code of Quad and DualLite uses the MMC interfaces
> differently when it loads the bootloader from that device:
>
>                 Register DLL_CTRL(0x60)  Bit 25 FBCLK_SEL (0x48)
>     Quad:       0x0                      0
>     DualLite:   0x01000021               1
>
> Since the linux kernel and barebox driver doesn't reset all registers,
> the MMC interface is in an inconsistent state, which leads to boot
> failures for some eMMC devices on the i.MX6 DualLite SoM. The errors
> look like:
>
>     mmcblk3: error -110 sending stop command, original cmd response 0x900, card status 0x400900
>     mmcblk3: error -84 transferring data, sector 24578, nr 2, cmd response 0x900, card status 0x0
>     mmcblk3: retrying using single block read
>     mmcblk3: error -84 transferring data, sector 24578, nr 2, cmd response 0x900, card status 0x0
>     blk_update_request: I/O error, dev mmcblk3, sector 24578
>
> It's sufficient to reset register DLL_CTRL and bit FBCLK_SEL. Register
> VEND_SPEC2 has no effect.
>
> Signed-off-by: Stefan Christ <s.christ@phytec.de>

Do you plan to fix this in the kernel driver as well?

Thanks

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  reply	other threads:[~2016-05-11 16:06 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-04 13:20 Stefan Christ
2016-05-11 16:05 ` Fabio Estevam [this message]
2016-05-17  7:45   ` Stefan Christ

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