Revert "umi: udfps: Disable HBM at fod_status changes"

This reverts commit 867d70b.

Reason for revert: Don't need this hack anymore

Change-Id: Ib5786e37ec6e02e1ce525849664eecd0e2a7b272

Author: chaptsand

init/init.xiaomi.rc

@@ -92,9 +92,6 @@ on boot
 
     chmod 0666 /dev/input/event2
 
-    chown system system /sys/devices/platform/soc/ae00000.qcom,mdss_mdp/drm/card0/card0-DSI-1/disp_param
-    chmod 0660 /sys/devices/platform/soc/ae00000.qcom,mdss_mdp/drm/card0/card0-DSI-1/disp_param
-
 on property:sys.boot_completed=1
     # configure input boost settings
     write /sys/devices/system/cpu/cpu_boost/input_boost_freq "0:1344000"

udfps/UdfpsHandler.cpp

@@ -11,7 +11,6 @@
 #include <android-base/logging.h>
 #include <android-base/unique_fd.h>
 #include <fcntl.h>
-#include <fstream>
 #include <poll.h>
 #include <thread>
 #include <unistd.h>
@@ -28,24 +27,11 @@
 #define TOUCH_MAGIC 0x5400
 #define TOUCH_IOC_SETMODE TOUCH_MAGIC + 0
 
-#define DISPPARAM_PATH "/sys/devices/platform/soc/ae00000.qcom,mdss_mdp/drm/card0/card0-DSI-1/disp_param"
-#define DISPPARAM_FOD_HBM_OFF "0xE0000"
-
 static const char* kFodUiPaths[] = {
         "/sys/devices/platform/soc/soc:qcom,dsi-display-primary/fod_ui",
         "/sys/devices/platform/soc/soc:qcom,dsi-display/fod_ui",
 };
 
-namespace {
-
-template <typename T>
-static void set(const std::string& path, const T& value) {
-    std::ofstream file(path);
-    file << value;
-}
-
-} // anonymous namespace
-
 static bool readBool(int fd) {
     char c;
     int rc;
@@ -114,7 +100,6 @@ class XiaomiKonaUdfpsHandler : public UdfpsHandler {
 
     void onAcquired(int32_t result, int32_t vendorCode) {
         if (result == FINGERPRINT_ACQUIRED_GOOD) {
-	    set(DISPPARAM_PATH, DISPPARAM_FOD_HBM_OFF);
             int arg[2] = {TOUCH_FOD_ENABLE, FOD_STATUS_OFF};
             ioctl(touch_fd_.get(), TOUCH_IOC_SETMODE, &arg);
         } else if (vendorCode == 21 || vendorCode == 23) {
@@ -128,7 +113,6 @@ class XiaomiKonaUdfpsHandler : public UdfpsHandler {
     }
 
     void cancel() {
-	set(DISPPARAM_PATH, DISPPARAM_FOD_HBM_OFF);
         int arg[2] = {TOUCH_FOD_ENABLE, FOD_STATUS_OFF};
         ioctl(touch_fd_.get(), TOUCH_IOC_SETMODE, &arg);
     }