Hi
On 2017/11/16 18:42, Ulf Hansson wrote:
On 16 November 2017 at 08:59, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote:
Hi,
On 2017/11/16 15:47, Ulf Hansson wrote:
On 14 November 2017 at 23:55, Wolfram Sang
<wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote:
Documentation/timers/timers-howto.txt recommends to use usleep_range for
delays 1-20ms. Let's adhere to it. No need for messing with HZ and still
do busy looping these days.
Sorry for chime in this topic but I think for some cases, for instance,
mmc_host_set_uhs_voltage calls mmc_delay and it should guarantee the
delay is accurate, especially for the comment"Keep clock gated for at
least 10 ms, though spec only says 5 ms"
But the usleep_range won't guarantee that, see
https://patchwork.kernel.org/patch/9369963/
It wasn't fixed at the end, so you should carefully modify
this fundamentally.
git tag --contains 6c5e9059692567740a4ee51530dffe51a4b9584d
It should be fixed, however, thanks for pointing to an interesting patch. :-)
Ah, I wasn't continuing tracing that topic and from the argue of v2,
I thought it wasn't fixed... So it seems fine now.
[...]
Kind regards
Uffe
