Re: [PATCH v2 0/5] Tegra SDHCI UHS-I support

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On 22 December 2015 at 19:40, Lucas Stach <dev@xxxxxxxxxx> wrote:
> Hi all,
>
> this series implements UHS-I signaling for the Tegra SDHCI host,
> which mainly means putting a proper tuning sequence in place.
>
> I've tested this on Jetson TK1 and got the following speed results,
> where mmcblk0 is the on-board eMMC and mmcblk1 is a micro SDXC card:
>
> Without series applied:
> hdparm -t /dev/mmcblk0
>  Timing buffered disk reads:  110 MB in  3.05 seconds =  36.02 MB/sec
> hdparm -t /dev/mmcblk1
>  Timing buffered disk reads:   56 MB in  3.01 seconds =  18.63 MB/sec
>
> With series applied:
> hdparm -t /dev/mmcblk0
>  Timing buffered disk reads:  236 MB in  3.00 seconds =  78.58 MB/sec
> hdparm -t /dev/mmcblk1
>  Timing buffered disk reads:  102 MB in  3.04 seconds =  33.51 MB/sec
>
> Tegra 30 does support UHS-I speeds too, but currently has problems
> when lowering the card voltage, which is needed in order to switch
> to UHS-I signaling. I have some more patches to fix this, but they
> need a bit more cleanup, with them applied the gains on Tegra30 are
> similar to the results above.
>
> For now the gains are limited to Tegra124+, with no regressions on
> Tegra30 and Tegra20.
>
> V2 fixes some minor style problems and is rebased on top of mmc/next.
> This means it enables the same tuning logic on Tegra210 also. I
> don't have a way to test this myself, so any testing on Tegra210 much
> appreciated.
>
> Regards,
> Lucas
>
> Lucas Stach (5):
>   mmc: tegra: implement module external clock change
>   mmc: tegra: disable SPI_MODE_CLKEN
>   mmc: tegra: implement UHS tuning
>   mmc: tegra: enable UHS-I modes
>   mmc: tegra: use correct accessor for misc ctrl register
>
>  drivers/mmc/host/sdhci-tegra.c | 166 ++++++++++++++++++++++++++++++++++-------
>  1 file changed, 138 insertions(+), 28 deletions(-)
>

Thanks, applied for next!

Kind regards
Uffe
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