AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-28 11:18:45 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

net: dsa: microchip: Implement recommended reset timing

Browse Source 
The datasheet for the ksz9893 and ksz9477 switches recommend waiting at
least 100us after the de-assertion of reset before trying to program the
device through any interface.

Also switch the existing msleep() call to usleep_range() as recommended
in Documentation/timers/timers-howto.rst. The 2ms range used here is
somewhat arbitrary, as long as the reset is asserted for at least 10ms
we should be ok.

Signed-off-by: Paul Barker <pbarker@konsulko.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Barker 2020-09-09 11:04:17 +01:00 committed by David S. Miller
parent ade64eb5be
commit 5b79798090
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/dsa/microchip/ksz_common.c
View File

@ -400,8 +400,9 @@ int ksz_switch_register(struct ksz_device *dev,
if (dev->reset_gpio) {
gpiod_set_value_cansleep(dev->reset_gpio, 1);
mdelay(10);
usleep_range(10000, 12000);
gpiod_set_value_cansleep(dev->reset_gpio, 0);
usleep_range(100, 1000);
}
mutex_init(&dev->dev_mutex);