On Thu, Jan 17, 2019 at 03:38:29PM +0100, Simon Horman wrote:
> Add SDHI3 UHS pin control and use it when enabling HS200 support
> for SDHI3.
HS400
> # dd if=/dev/mmcblk0 of=/dev/null bs=1M count=512 iflag=direct
> 512+0 records in
> 512+0 records out
> 536870912 bytes (537 MB) copied, 9.02486 s, 59.5 MB/s
> # dd if=/dev/mmcblk0 of=/dev/null bs=1M count=512 iflag=direct
> 512+0 records in
> 512+0 records out
> 536870912 bytes (537 MB) copied, 7.36003 s, 72.9 MB/s
> # dd if=/dev/mmcblk0 of=/dev/null bs=1M count=512 iflag=direct
> 512+0 records in
> 512+0 records out
> 536870912 bytes (537 MB) copied, 11.0156 s, 48.7 MB/s
Hmmmm, quite some fluctuation and far away from the performances of M3N.
Marek, do you have an idea why? Did you note any E3 differences when
coding support for U-Boot?
> diff --git a/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts b/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts
> index 89383aa35d65..f2846c9eb83f 100644
> --- a/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts
> +++ b/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts
> @@ -535,6 +535,12 @@
> power-source = <1800>;
> };
>
> + sdhi3_pins_uhs: sd3_uhs {
> + groups = "sdhi3_data8", "sdhi3_ctrl", "sdhi3_ds";
> + function = "sdhi3";
> + power-source = <1800>;
> + };
> +
This is exactly the same as sdhi3_pins, so no need.
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