• Abel Vesa's avatar
    irqchip: irq-imx-gpcv2: Add workaround for i.MX8MQ ERR11171 · 617f7964
    Abel Vesa authored
    i.MX8MQ is missing the wake_request signals from GIC to GPCv2. This indirectly
    breaks cpuidle support due to inability to wake target cores on IPIs.
    
    Here is the link to the errata (see e11171):
    
    https://www.nxp.com/docs/en/errata/IMX8MDQLQ_0N14W.pdf
    
    Now, in order to fix this, we can trigger IRQ 32 (hwirq 0) to all the cores by
    setting 12th bit in IOMUX_GPR1 register. In order to control the target cores
    only, that is, not waking up all the cores every time, we can unmask/mask the
    IRQ 32 in the first GPC IMR register. So basically we can leave the IOMUX_GPR1
    12th bit always set and just play with the masking and unmasking the IRO 32 for
    each independent core.
    
    Since EL3 is the one that deals with powering down/up the cores, and since the
    cores wake up in EL3, EL3 should be the one to control the IMRs in this case.
    This implies we need to get into EL3 on every IPI to do the unmasking, leaving
    the masking to be done on the power-up sequence by the core itself.
    
    In order to be able to get into EL3 on each IPI, we 'hijack' the registered smp
    cross call handler, in this case the gic_raise_softirq which is registered by
    the irq-gic-v3 driver and register our own handler instead. This new handler is
    basically a wrapper over the hijacked handler plus the call into EL3.
    
    To get into EL3, we use a custom vendor SIP id added just for this purpose.
    
    All of this is conditional for i.MX8MQ only.
    Signed-off-by: default avatarAbel Vesa <abel.vesa@nxp.com>
    617f7964
Name
Last commit
Last update
..
accessibility Loading commit data...
acpi Loading commit data...
amba Loading commit data...
android Loading commit data...
ata Loading commit data...
atm Loading commit data...
auxdisplay Loading commit data...
base Loading commit data...
bcma Loading commit data...
block Loading commit data...
bluetooth Loading commit data...
bus Loading commit data...
cdrom Loading commit data...
char Loading commit data...
clk Loading commit data...
clocksource Loading commit data...
connector Loading commit data...
counter Loading commit data...
cpufreq Loading commit data...
cpuidle Loading commit data...
crypto Loading commit data...
dax Loading commit data...
dca Loading commit data...
devfreq Loading commit data...
dio Loading commit data...
dma Loading commit data...
dma-buf Loading commit data...
edac Loading commit data...
eisa Loading commit data...
extcon Loading commit data...
firewire Loading commit data...
firmware Loading commit data...
fpga Loading commit data...
fsi Loading commit data...
gnss Loading commit data...
gpio Loading commit data...
gpu Loading commit data...
hid Loading commit data...
hsi Loading commit data...
hv Loading commit data...
hwmon Loading commit data...
hwspinlock Loading commit data...
hwtracing Loading commit data...
i2c Loading commit data...
i3c Loading commit data...
ide Loading commit data...
idle Loading commit data...
iio Loading commit data...
infiniband Loading commit data...
input Loading commit data...
interconnect Loading commit data...
iommu Loading commit data...
ipack Loading commit data...
irqchip Loading commit data...
isdn Loading commit data...
leds Loading commit data...
lightnvm Loading commit data...
macintosh Loading commit data...
mailbox Loading commit data...
mcb Loading commit data...
md Loading commit data...
media Loading commit data...
memory Loading commit data...
memstick Loading commit data...
message Loading commit data...
mfd Loading commit data...
misc Loading commit data...
mmc Loading commit data...
mtd Loading commit data...
mux Loading commit data...
net Loading commit data...
nfc Loading commit data...
ntb Loading commit data...
nubus Loading commit data...
nvdimm Loading commit data...
nvme Loading commit data...
nvmem Loading commit data...
of Loading commit data...
opp Loading commit data...
oprofile Loading commit data...
parisc Loading commit data...
parport Loading commit data...
pci Loading commit data...
pcmcia Loading commit data...
perf Loading commit data...
phy Loading commit data...
pinctrl Loading commit data...
platform Loading commit data...
pnp Loading commit data...
power Loading commit data...
powercap Loading commit data...
pps Loading commit data...
ps3 Loading commit data...
ptp Loading commit data...
pwm Loading commit data...
rapidio Loading commit data...
ras Loading commit data...
regulator Loading commit data...
remoteproc Loading commit data...
reset Loading commit data...
rpmsg Loading commit data...
rtc Loading commit data...
s390 Loading commit data...
sbus Loading commit data...
scsi Loading commit data...
sfi Loading commit data...
sh Loading commit data...
siox Loading commit data...
slimbus Loading commit data...
sn Loading commit data...
soc Loading commit data...
soundwire Loading commit data...
spi Loading commit data...
spmi Loading commit data...
ssb Loading commit data...
staging Loading commit data...
target Loading commit data...
tc Loading commit data...
tee Loading commit data...
thermal Loading commit data...
thunderbolt Loading commit data...
tty Loading commit data...
uio Loading commit data...
usb Loading commit data...
uwb Loading commit data...
vfio Loading commit data...
vhost Loading commit data...
video Loading commit data...
virt Loading commit data...
virtio Loading commit data...
visorbus Loading commit data...
vlynq Loading commit data...
vme Loading commit data...
w1 Loading commit data...
watchdog Loading commit data...
xen Loading commit data...
zorro Loading commit data...
Kconfig Loading commit data...
Makefile Loading commit data...