linux-kernel - Re: [PATCH v2 6/8] mmc: sdhci-st: Update the quirks for this controller.

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Date:	Tue, 3 Mar 2015 11:57:47 +0100
From:	Maxime Coquelin <maxime.coquelin@...com>
To:	Peter Griffin <peter.griffin@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <patrice.chotard@...com>,
	<srinivas.kandagatla@...il.com>, <chris@...ntf.net>,
	<ulf.hansson@...aro.org>
CC:	<lee.jones@...aro.org>, <devicetree@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>, <peppe.cavallaro@...com>
Subject: Re: [PATCH v2 6/8] mmc: sdhci-st: Update the quirks for this controller.


On 02/26/2015 02:10 PM, Peter Griffin wrote:
> Some additional quirks need to be enabled now we support UHS
> modes. This avoids some spurious warnings like
>
> "Got data interrupt 0x00000002 even though no data operation was in progress"
>
> Testing on stih410-b2120 board achieves the following speeds
> with HS200 eMMC card.
>
> max-frequency = 200Mhz
> /dev/mmcblk0p1:
>   Timing buffered disk reads: 270 MB in  3.02 seconds =  89.54 MB/sec
>
> max-frequency = 100Mhz
> root@...ian-armhf:~# hdparm -t /dev/mmcblk0p1
> /dev/mmcblk0p1:
>   Timing buffered disk reads: 210 MB in  3.00 seconds =  70.00 MB/sec
>
> max-frequency = 50Mhz
> root@...ian-armhf:~# hdparm -t /dev/mmcblk0p1
> /dev/mmcblk0p1:
>   Timing buffered disk reads: 118 MB in  3.00 seconds =  39.28 MB/sec
>
> This is better than the 3.10 kernel which achieves 77.59 MB/sec
> at 200Mhz clock (same board/soc/eMMC).
>
> Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
> ---
>   drivers/mmc/host/sdhci-st.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>

Acked-by: Maxime Coquelin <maxime.coquelin@...com>

Thanks,
Maxime
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