upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-05-28 04:12:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

iicbb: Fix pause_sbt() arguments order

Browse source 
It should make pause interval less strict.

While there, add cpu_spinwait() into a tight spin wait loop to burn
less power and let other SMT thread work more.

MFC after:	1 month

(cherry picked from commit a74df3f96e3ea4cc632088be870d9b0b0198859c)
This commit is contained in:
Alexander Motin 2023-12-23 18:52:17 -05:00
parent 7033c3ddd6
commit 354ccf64bf
1 changed files with 3 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
sys/dev/iicbus/iicbb.c
View file

@ -52,6 +52,7 @@
#include <sys/bus.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <machine/cpu.h>
#ifdef FDT
#include <dev/ofw/ofw_bus.h>
@ -254,11 +255,12 @@ iicbb_waitforscl(device_t dev)
do {
if (I2C_GETSCL(dev))
return (0);
cpu_spinwait();
now = sbinuptime();
} while (now < fast_timeout);
do {
I2C_DEBUG(printf("."));
pause_sbt("iicbb-scl-low", SBT_1MS, C_PREL(8), 0);
pause_sbt("iicbb-scl-low", SBT_1MS, 0, C_PREL(2));
if (I2C_GETSCL(dev))
return (0);
now = sbinuptime();