On Thu, May 08, 2014 at 06:17:32PM +0800, Dong Aisheng wrote:
> I just tested an old Chris/mmc-next tree which is 3.14 rc2 with the top commit is b42b9b.
> The eMMC works well on SabreSD boards.
> But it failed and got the same issue with latest chris/mmc-next tree.
> I noticed there's no changes on sdhci-esdhc-imx.c
> Probably some other changes breaks this function.
>
> Fabio,
> You may bisect it yourself or i will do it later when i'm a bit free.
The regression is caused by the following commit ...
commit 79f7ae7c45a6ccf04e2908337461dee615f6afb0
Author: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
Date: Fri Mar 14 21:11:56 2014 +0900
mmc: clarify DDR timing mode between SD-UHS and eMMC
This change distinguishes DDR timing mode of current
mixed usage to clarify device type.
Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
Acked-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Chris Ball <chris@xxxxxxxxxx>
... and the line below.
@@ -1264,7 +1264,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
goto err;
}
mmc_card_set_ddr_mode(card);
- mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
+ mmc_set_timing(card->host, MMC_TIMING_MMC_DDR52);
mmc_set_bus_width(card->host, bus_width);
}
}
> Shawn,
> I remember this patch should have been upstream through your tree long time ago.
> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-October/206446.html
> It seems somehow missed.
Ah, yes. It got lost.
Shawn
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