Re: [PATCH 1/1] ARM: dts: Add HS400 support for exynos5422-odroidxu3

[Markus Reichl <m.reichl@fivetechno.de>]

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Am 30.03.2015 um 17:51 schrieb Markus Reichl:
> HS400 timing values are added for exynos5422-odroidxu3 board.
> ---
> This patch is analog to [0].
> This patch needs [0] for the pin-ctrl definition of sd0_rclk.
> 
> [0]: https://www.mail-archive.com/linux-samsung-soc%40vger.kernel.org/msg42902.html
> 
> Signed-off-by: Markus Reichl <m.reichl@fivetechno.de>
> ---
>  arch/arm/boot/dts/exynos5422-odroidxu3.dts | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3.dts b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> index a519c86..0408ec0 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> @@ -298,15 +298,20 @@
>  
>  &mmc_0 {
>  	status = "okay";
> +	num-slots = <1>;
>  	broken-cd;
>  	card-detect-delay = <200>;
>  	samsung,dw-mshc-ciu-div = <3>;
>  	samsung,dw-mshc-sdr-timing = <0 4>;
>  	samsung,dw-mshc-ddr-timing = <0 2>;
> +	samsung,dw-mshc-hs400-timing = <0 2>;
> +	samsung,read-strobe-delay = <90>;
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus4 &sd0_bus8>;
> +	pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus1 &sd0_bus4 &sd0_bus8 &sd0_rclk>;
>  	bus-width = <8>;
>  	cap-mmc-highspeed;
> +	mmc-hs200-1_8v;
> +	mmc-hs400-1_8v;
>  };
>  
>  &mmc_2 {
> 

hdparm -t /dev/mmcblk0

without this patch:
/dev/mmcblk0:
 Timing buffered disk reads: 230 MB in  3.01 seconds =  76.30 MB/sec

with this patch:
/dev/mmcblk0:
 Timing buffered disk reads: 588 MB in  3.00 seconds = 195.92 MB/sec

cat /sys/kernel/debug/mmc0/ios

without patch:
clock:          52000000 Hz
vdd:            7 (1.65 - 1.95 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      3 (8 bits)
timing spec:    8 (mmc DDR52)
signal voltage: 0 (1.80 V)

with patch:
clock:          200000000 Hz
vdd:            7 (1.65 - 1.95 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      3 (8 bits)
timing spec:    10 (mmc HS400)
signal voltage: 0 (1.80 V)

Best Regards
-- 
Markus Reichl


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