set camera and gpu irq affinities (#2678)

* pin camera and gpu to core 2

* can't forget about 177

launch_chffrplus.sh

@@ -17,7 +17,9 @@ function two_init {
   # Wifi scan
   wpa_cli IFNAME=wlan0 SCAN
 
-  # Restrict Android and other system processes to the first two cores
+  # *** shield cores 2-3 ***
+
+  # android gets two cores
   echo 0-1 > /dev/cpuset/background/cpus
   echo 0-1 > /dev/cpuset/system-background/cpus
   echo 0-1 > /dev/cpuset/foreground/cpus
@@ -27,7 +29,8 @@ function two_init {
   # openpilot gets all the cores
   echo 0-3 > /dev/cpuset/app/cpus
 
-  # set up governors
+  # *** set up governors ***
+
   # +50mW offroad, +500mW onroad for 30% more RAM bandwidth
   echo "performance" > /sys/class/devfreq/soc:qcom,cpubw/governor
   echo 1056000 > /sys/class/devfreq/soc:qcom,m4m/max_freq
@@ -43,6 +46,8 @@ function two_init {
   # /sys/class/devfreq/soc:qcom,mincpubw is the only one left at "powersave"
   # it seems to gain nothing but a wasted 500mW
 
+  # *** set up IRQ affinities ***
+
   # Collect RIL and other possibly long-running I/O interrupts onto CPU 1
   echo 1 > /proc/irq/78/smp_affinity_list # qcom,smd-modem (LTE radio)
   echo 1 > /proc/irq/33/smp_affinity_list # ufshcd (flash storage)
@@ -53,6 +58,13 @@ function two_init {
   [ -d "/proc/irq/733" ] && echo 3 > /proc/irq/733/smp_affinity_list # USB for LeEco
   [ -d "/proc/irq/736" ] && echo 3 > /proc/irq/736/smp_affinity_list # USB for OP3T
 
+  # GPU and camera get cpu 2
+  CAM_IRQS="177 178 179 180 181 182 183 184 185 186 192"
+  for irq in $CAM_IRQS; do
+    echo 2 > /proc/irq/$irq/smp_affinity_list
+  done
+  echo 2 > /proc/irq/193/smp_affinity_list # GPU
+
   # Check for NEOS update
   if [ $(< /VERSION) != "$REQUIRED_NEOS_VERSION" ]; then
     if [ -f "$DIR/scripts/continue.sh" ]; then