From: eric.nelson@boundarydevices.com (Eric Nelson)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/6] mmc: sdhci-esdhc-imx: config watermater levles and burst lengths
Date: Wed, 10 Jun 2015 07:36:00 -0700 [thread overview]
Message-ID: <55784B50.6030101@boundarydevices.com> (raw)
In-Reply-To: <1433926244-29244-5-git-send-email-haibo.chen@freescale.com>
Hi Haibo,
On 06/10/2015 01:50 AM, Haibo Chen wrote:
> i.MX7D support eMMC HS400 mode, this mode can run in 8 bit,200MHZ
> DDR mode. So the I/O speed improve a lot compare to SD3.0
>
> The default burst length is 8, if we don't change this value, in
> HS400 mode, when we do eMMC read operation, we can find that the
> clock signal will stop for a period of time. This means the speed
> of data moving on AHB bus is slower than I/O speed. So we should
> improve the speed of data moving on AHB bus.
>
> For imx7d usdhc, this patch set the burst length as 16, and set
> watermater levle as 64. The test result is the clock signal has
> no stop during the eMMC HS400 operation. For other imx usdhc, remain
"watermark", not "watermater".
> the default value: burst length as 8, watermater level as 16.
>
Same goes for the subject.
Also "levels", not "levles", so:
mmc: sdhci-esdhc-imx: config watermark level and burst length
next prev parent reply other threads:[~2015-06-10 14:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 8:50 [PATCH 0/6] mmc: imx: a few fixes and new feature add Haibo Chen
2015-06-10 8:50 ` [PATCH 1/6] mmc: sdhci-esdhc-imx: add imx7d support and support HS400 Haibo Chen
2015-06-10 8:50 ` [PATCH 2/6] mmc: sdhci-esdhc-imx: add tuning-step seting support Haibo Chen
2015-07-03 11:10 ` Shawn Guo
2015-07-06 3:05 ` Chen Bough
2015-07-08 9:00 ` Shawn Guo
2015-06-10 8:50 ` [PATCH 3/6] ARM: dts: imx7d-sdb: add eMMC5.0 support Haibo Chen
2015-06-10 8:50 ` [PATCH 4/6] mmc: sdhci-esdhc-imx: config watermater levles and burst lengths Haibo Chen
2015-06-10 14:36 ` Eric Nelson [this message]
2015-06-10 8:50 ` [PATCH 5/6] mmc: sdhci-esdhc-imx: set back the burst_length_enable bit to 1 Haibo Chen
2015-06-10 8:50 ` [PATCH 6/6] mmc: sdhci-esdhc-imx: add compatible string in binding doc Haibo Chen
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