Hi Simon,
On Fri, Jan 18, 2019 at 1:25 PM Simon Horman <horms+renesas@xxxxxxxxxxxx> wrote:
> Enable HS400 of SDHI3 using the corresponding DT property.
> No further changes are required.
>
> Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Using "hdparm -tT /dev/mmcblk0"
HS200:
Timing cached reads: 694 MB in 2.00 seconds = 346.60 MB/sec
Timing buffered disk reads: 434 MB in 3.00 seconds = 144.56 MB/sec
HS400:
Timing cached reads: 696 MB in 2.00 seconds = 348.20 MB/sec
Timing buffered disk reads: 446 MB in 3.00 seconds = 148.65 MB/sec
No real difference.
Note that "dd" gives me very fluctuating results (all for HS400):
root@ebisu:~# dd if=/dev/mmcblk0 of=/dev/null bs=1M count=128 iflag=direct
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 3.20103 s, 41.9 MB/s
root@ebisu:~# dd if=/dev/mmcblk0 of=/dev/null bs=1M count=128 iflag=direct
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.15324 s, 116 MB/s
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.82701 s, 73.5 MB/s
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
