diff --git a/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp b/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
index a568a3c..9484ddd 100644
--- a/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
+++ b/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
@@ -63,6 +63,7 @@
 using ::android::hardware::audio::V4_0::DeviceAddress;
 using ::android::hardware::audio::V4_0::IDevice;
 using ::android::hardware::audio::V4_0::IPrimaryDevice;
+using Rotation = ::android::hardware::audio::V4_0::IPrimaryDevice::Rotation;
 using TtyMode = ::android::hardware::audio::V4_0::IPrimaryDevice::TtyMode;
 using ::android::hardware::audio::V4_0::IDevicesFactory;
 using ::android::hardware::audio::V4_0::IStream;
@@ -95,6 +96,11 @@
 
 using namespace ::android::hardware::audio::common::test::utility;
 
+// Typical accepted results from interface methods
+static auto okOrNotSupported = {Result::OK, Result::NOT_SUPPORTED};
+static auto okOrNotSupportedOrInvalidArgs = {Result::OK, Result::NOT_SUPPORTED,
+                                             Result::INVALID_ARGUMENTS};
+
 class AudioHidlTestEnvironment : public ::Environment {
    public:
     virtual void registerTestServices() override { registerTestService<IDevicesFactory>(); }
@@ -439,11 +445,7 @@
 TEST_F(AudioPrimaryHidlTest, setScreenState) {
     doc::test("Check that the hal can receive the screen state");
     for (bool turnedOn : {false, true, true, false, false}) {
-        auto ret = device->setScreenState(turnedOn);
-        ASSERT_IS_OK(ret);
-        Result result = ret;
-        auto okOrNotSupported = {Result::OK, Result::NOT_SUPPORTED};
-        ASSERT_RESULT(okOrNotSupported, result);
+        ASSERT_RESULT(okOrNotSupported, device->setScreenState(turnedOn));
     }
 }
 
@@ -783,7 +785,7 @@
                testCapabilityGetter("getSupportedFormat", stream.get(), &getSupportedFormats,
                                     &IStream::getFormat, &IStream::setFormat))
 
-static void testGetDevice(IStream* stream, AudioDevice expectedDevice) {
+static void testGetDevices(IStream* stream, AudioDevice expectedDevice) {
     hidl_vec<DeviceAddress> devices;
     Result res;
     ASSERT_OK(stream->getDevices(returnIn(res, devices)));
@@ -798,11 +800,11 @@
         << "\n  Actual: " << ::testing::PrintToString(device);
 }
 
-TEST_IO_STREAM(GetDevice, "Check that the stream device == the one it was opened with",
+TEST_IO_STREAM(GetDevices, "Check that the stream device == the one it was opened with",
                areAudioPatchesSupported() ? doc::partialTest("Audio patches are supported")
-                                          : testGetDevice(stream.get(), address.device))
+                                          : testGetDevices(stream.get(), address.device))
 
-static void testSetDevice(IStream* stream, const DeviceAddress& address) {
+static void testSetDevices(IStream* stream, const DeviceAddress& address) {
     DeviceAddress otherAddress = address;
     otherAddress.device = (address.device & AudioDevice::BIT_IN) == 0 ? AudioDevice::OUT_SPEAKER
                                                                       : AudioDevice::IN_BUILTIN_MIC;
@@ -811,9 +813,9 @@
     ASSERT_OK(stream->setDevices({address}));  // Go back to the original value
 }
 
-TEST_IO_STREAM(SetDevice, "Check that the stream can be rerouted to SPEAKER or BUILTIN_MIC",
+TEST_IO_STREAM(SetDevices, "Check that the stream can be rerouted to SPEAKER or BUILTIN_MIC",
                areAudioPatchesSupported() ? doc::partialTest("Audio patches are supported")
-                                          : testSetDevice(stream.get(), address))
+                                          : testSetDevices(stream.get(), address))
 
 static void testGetAudioProperties(IStream* stream, AudioConfig expectedConfig) {
     uint32_t sampleRateHz;
@@ -833,10 +835,8 @@
                "Check that the stream audio properties == the ones it was opened with",
                testGetAudioProperties(stream.get(), audioConfig))
 
-static auto invalidArgsOrNotSupportedOrOK = {Result::INVALID_ARGUMENTS, Result::NOT_SUPPORTED,
-                                             Result::OK};
 TEST_IO_STREAM(SetHwAvSync, "Try to set hardware sync to an invalid value",
-               ASSERT_RESULT(invalidArgsOrNotSupportedOrOK, stream->setHwAvSync(666)))
+               ASSERT_RESULT(okOrNotSupportedOrInvalidArgs, stream->setHwAvSync(666)))
 
 static void checkGetHwAVSync(IDevice* device) {
     Result res;
@@ -882,7 +882,7 @@
                // error code when a key is not supported.
                // To allow implementation to just wrapped the legacy one, consider OK as a
                // valid result for setting a non existing parameter.
-               ASSERT_RESULT(invalidArgsOrNotSupportedOrOK,
+               ASSERT_RESULT(okOrNotSupportedOrInvalidArgs,
                              stream->setParameters({}, {{"non existing key", "0"}})))
 
 TEST_IO_STREAM(DebugDump, "Check that a stream can dump its state without error",
@@ -1147,7 +1147,6 @@
     auto res = stream->setCallback(new MockOutCallbacks);
     stream->clearCallback();  // try to restore the no callback state, ignore
                               // any error
-    auto okOrNotSupported = {Result::OK, Result::NOT_SUPPORTED};
     EXPECT_RESULT(okOrNotSupported, res);
     return res.isOk() ? res == Result::OK : false;
 }
@@ -1257,6 +1256,11 @@
     ASSERT_PRED2([](auto c, auto m) { return c - m < 1e+6; }, currentTime, mesureTime);
 }
 
+TEST_P(OutputStreamTest, SelectPresentation) {
+    doc::test("Verify that presentation selection does not crash");
+    ASSERT_RESULT(okOrNotSupported, stream->selectPresentation(0, 0));
+}
+
 //////////////////////////////////////////////////////////////////////////////
 /////////////////////////////// PrimaryDevice ////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
@@ -1283,6 +1287,42 @@
     }
 }
 
+TEST_F(AudioPrimaryHidlTest, setBtHfpSampleRate) {
+    doc::test(
+        "Make sure setBtHfpSampleRate either succeeds or "
+        "indicates that it is not supported at all, or that the provided value is invalid");
+    for (auto samplingRate : {8000, 16000, 22050, 24000}) {
+        ASSERT_RESULT(okOrNotSupportedOrInvalidArgs, device->setBtHfpSampleRate(samplingRate));
+    }
+}
+
+TEST_F(AudioPrimaryHidlTest, setBtHfpVolume) {
+    doc::test(
+        "Make sure setBtHfpVolume is either not supported or "
+        "only succeed if volume is in [0,1]");
+    auto ret = device->setBtHfpVolume(0.0);
+    if (ret == Result::NOT_SUPPORTED) {
+        doc::partialTest("setBtHfpVolume is not supported");
+        return;
+    }
+    testUnitaryGain([](float volume) { return device->setBtHfpVolume(volume); });
+}
+
+TEST_F(AudioPrimaryHidlTest, setBtScoHeadsetDebugName) {
+    doc::test(
+        "Make sure setBtScoHeadsetDebugName either succeeds or "
+        "indicates that it is not supported");
+    ASSERT_RESULT(okOrNotSupported, device->setBtScoHeadsetDebugName("test"));
+}
+
+TEST_F(AudioPrimaryHidlTest, updateRotation) {
+    doc::test("Check that the hal can receive the current rotation");
+    for (Rotation rotation : {Rotation::DEG_0, Rotation::DEG_90, Rotation::DEG_180,
+                              Rotation::DEG_270, Rotation::DEG_0}) {
+        ASSERT_RESULT(okOrNotSupported, device->updateRotation(rotation));
+    }
+}
+
 TEST_F(BoolAccessorPrimaryHidlTest, BtScoNrecEnabled) {
     doc::test("Query and set the BT SCO NR&EC state");
     testOptionalAccessors("BtScoNrecEnabled", {true, false, true},
@@ -1297,6 +1337,12 @@
                           &IPrimaryDevice::getBtScoWidebandEnabled);
 }
 
+TEST_F(BoolAccessorPrimaryHidlTest, setGetBtHfpEnabled) {
+    doc::test("Query and set the BT HFP state");
+    testOptionalAccessors("BtHfpEnabled", {true, false, true}, &IPrimaryDevice::setBtHfpEnabled,
+                          &IPrimaryDevice::getBtHfpEnabled);
+}
+
 using TtyModeAccessorPrimaryHidlTest = AccessorPrimaryHidlTest<TtyMode>;
 TEST_F(TtyModeAccessorPrimaryHidlTest, setGetTtyMode) {
     doc::test("Query and set the TTY mode state");
diff --git a/audio/core/all-versions/default/include/core/all-versions/default/PrimaryDevice.impl.h b/audio/core/all-versions/default/include/core/all-versions/default/PrimaryDevice.impl.h
index f00cac4..9b39d9c 100644
--- a/audio/core/all-versions/default/include/core/all-versions/default/PrimaryDevice.impl.h
+++ b/audio/core/all-versions/default/include/core/all-versions/default/PrimaryDevice.impl.h
@@ -16,6 +16,10 @@
 
 #include <common/all-versions/IncludeGuard.h>
 
+#ifdef AUDIO_HAL_VERSION_4_0
+#include <cmath>
+#endif
+
 namespace android {
 namespace hardware {
 namespace audio {
@@ -244,7 +248,13 @@
     return mDevice->setParam(AUDIO_PARAMETER_KEY_HFP_SET_SAMPLING_RATE, int(sampleRateHz));
 }
 Return<Result> PrimaryDevice::setBtHfpVolume(float volume) {
-    return mDevice->setParam(AUDIO_PARAMETER_KEY_HFP_VOLUME, volume);
+    if (!all_versions::implementation::isGainNormalized(volume)) {
+        ALOGW("Can not set BT HFP volume (%f) outside [0,1]", volume);
+        return Result::INVALID_ARGUMENTS;
+    }
+    // Map the normalized volume onto the range of [0, 15]
+    return mDevice->setParam(AUDIO_PARAMETER_KEY_HFP_VOLUME,
+                             static_cast<int>(std::round(volume * 15)));
 }
 Return<Result> PrimaryDevice::updateRotation(IPrimaryDevice::Rotation rotation) {
     // legacy API expects the rotation in degree
diff --git a/automotive/vehicle/2.0/types.hal b/automotive/vehicle/2.0/types.hal
index 15ba494..12e2257 100644
--- a/automotive/vehicle/2.0/types.hal
+++ b/automotive/vehicle/2.0/types.hal
@@ -654,7 +654,8 @@
      * HVAC current temperature.
      *
      * @change_mode VehiclePropertyChangeMode:ON_CHANGE
-     * @access VehiclePropertyAccess:READ_WRITE
+     * @access VehiclePropertyAccess:READ
+     * @unit VehicleUnit:CELSIUS
      */
     HVAC_TEMPERATURE_CURRENT = (
         0x0502
@@ -667,6 +668,7 @@
      *
      * @change_mode VehiclePropertyChangeMode:ON_CHANGE
      * @access VehiclePropertyAccess:READ_WRITE
+     * @unit VehicleUnit:CELSIUS
      */
     HVAC_TEMPERATURE_SET = (
         0x0503
@@ -791,7 +793,7 @@
         | VehicleArea:SEAT),
 
     /**
-     * Seat temperature
+     * Seat heating/cooling
      *
      * Negative values indicate cooling.
      * 0 indicates off.
@@ -847,9 +849,11 @@
     /**
      * Temperature units for display
      *
-     * Indicates whether the temperature is in Celsius, Fahrenheit, or a
-     * different unit from VehicleUnit enum.  This parameter MAY be used for
-     * displaying any HVAC temperature in the system.
+     * Indicates whether the vehicle is displaying temperature to the user as
+     * Celsius or Fahrenheit.
+     * This parameter MAY be used for displaying any HVAC temperature in the system.
+     * Values must be one of VehicleUnit::CELSIUS or VehicleUnit::FAHRENHEIT
+     * Note that internally, all temperatures are represented in floating point Celsius.
      *
      * @change_mode VehiclePropertyChangeMode:ON_CHANGE
      * @access VehiclePropertyAccess:READ_WRITE
@@ -1629,8 +1633,8 @@
     /**
      * Window Position
      *
-     * Max = window up / closed
-     * Min = window down / open
+     * Min = window up / closed
+     * Max = window down / open
      *
      * For a window that may open out of plane (i.e. vent mode of sunroof) this
      * parameter will work with negative values as follows:
@@ -1652,25 +1656,25 @@
     /**
      * Window Move
      *
-     * Max = window up / closed
-     * Min = window down / open
-     * Magnitude denotes relative speed.  I.e. +2 is faster than +1 in raising
+     * Max = Open the window as fast as possible
+     * Min = Close the window as fast as possible
+     * Magnitude denotes relative speed.  I.e. +2 is faster than +1 in closing
      * the window.
      *
      * For a window that may open out of plane (i.e. vent mode of sunroof) this
      * parameter will work as follows:
      *
-     *  If sunroof is open:
-     *    Max = open the sunroof further, automatically stop when fully open.
-     *    Min = close the sunroof, automatically stop when sunroof is closed.
+     * If sunroof is open:
+     *   Max = open the sunroof further, automatically stop when fully open.
+     *   Min = close the sunroof, automatically stop when sunroof is closed.
      *
      * If vent is open:
-     *  Max = close the vent, automatically stop when vent is closed.
-     *  Min = open the vent further, automatically stop when vent is fully open.
+     *   Max = close the vent, automatically stop when vent is closed.
+     *   Min = open the vent further, automatically stop when vent is fully open.
      *
-     * If window is in the closed position:
-     *  Max = open the sunroof, automatically stop when sunroof is fully open.
-     *  Min = open the vent, automatically stop when vent is fully open.
+     * If sunroof is in the closed position:
+     *   Max = open the sunroof, automatically stop when sunroof is fully open.
+     *   Min = open the vent, automatically stop when vent is fully open.
      *
      * @change_mode VehiclePropertyChangeMode:ON_CHANGE
      * @access VehiclePropertyAccess:READ_WRITE
diff --git a/current.txt b/current.txt
index 7e4b102..75b1a06 100644
--- a/current.txt
+++ b/current.txt
@@ -299,7 +299,7 @@
 3b17c1fdfc389e0abe626c37054954b07201127d890c2bc05d47613ec1f4de4f android.hardware.automotive.evs@1.0::types
 b3caf524c46a47d67e6453a34419e1881942d059e146cda740502670e9a752c3 android.hardware.automotive.vehicle@2.0::IVehicle
 7ce8728b27600e840cacf0a832f6942819fe535f9d3797ae052d5eef5065921c android.hardware.automotive.vehicle@2.0::IVehicleCallback
-848fb32d5ca79dd527d966e67c0af5874b6d7b361246b491e315cf7dea7888ab android.hardware.automotive.vehicle@2.0::types
+2e1815967a3e3278a7f304ed7efc04fbc56d0bb65b3126248c3a0d515b93f63d android.hardware.automotive.vehicle@2.0::types
 32cc50cc2a7658ec613c0c2dd2accbf6a05113b749852879e818b8b7b438db19 android.hardware.bluetooth.a2dp@1.0::IBluetoothAudioHost
 ff4be64d7992f8bec97dff37f35450e79b3430c61f85f54322ce45bef229dc3b android.hardware.bluetooth.a2dp@1.0::IBluetoothAudioOffload
 27f22d2e873e6201f9620cf4d8e2facb25bd0dd30a2b911e441b4600d560fa62 android.hardware.bluetooth.a2dp@1.0::types
diff --git a/wifi/1.2/default/wifi_chip.cpp b/wifi/1.2/default/wifi_chip.cpp
index dcd0a3c..ab96ef1 100644
--- a/wifi/1.2/default/wifi_chip.cpp
+++ b/wifi/1.2/default/wifi_chip.cpp
@@ -48,6 +48,7 @@
 constexpr char kCpioMagic[] = "070701";
 constexpr size_t kMaxBufferSizeBytes = 1024 * 1024;
 constexpr uint32_t kMaxRingBufferFileAgeSeconds = 60 * 60;
+constexpr uint32_t kMaxRingBufferFileNum = 20;
 constexpr char kTombstoneFolderPath[] = "/data/vendor/tombstones/wifi/";
 
 template <typename Iface>
@@ -104,7 +105,9 @@
     return buffer.data();
 }
 
-// delete files older than a predefined time in the wifi tombstone dir
+// delete files that meet either conditions:
+// 1. older than a predefined time in the wifi tombstone dir.
+// 2. Files in excess to a predefined amount, starting from the oldest ones
 bool removeOldFilesInternal() {
     time_t now = time(0);
     const time_t delete_files_before = now - kMaxRingBufferFileAgeSeconds;
@@ -116,6 +119,7 @@
     unique_fd dir_auto_closer(dirfd(dir_dump));
     struct dirent* dp;
     bool success = true;
+    std::list<std::pair<const time_t, std::string>> valid_files;
     while ((dp = readdir(dir_dump))) {
         if (dp->d_type != DT_REG) {
             continue;
@@ -129,12 +133,23 @@
             success = false;
             continue;
         }
-        if (cur_file_stat.st_mtime >= delete_files_before) {
-            continue;
-        }
-        if (unlink(cur_file_path.c_str()) != 0) {
-            LOG(ERROR) << "Error deleting file " << strerror(errno);
-            success = false;
+        const time_t cur_file_time = cur_file_stat.st_mtime;
+        valid_files.push_back(
+            std::pair<const time_t, std::string>(cur_file_time, cur_file_path));
+    }
+    valid_files.sort();  // sort the list of files by last modified time from
+                         // small to big.
+    uint32_t cur_file_count = valid_files.size();
+    for (auto cur_file : valid_files) {
+        if (cur_file_count > kMaxRingBufferFileNum ||
+            cur_file.first < delete_files_before) {
+            if (unlink(cur_file.second.c_str()) != 0) {
+                LOG(ERROR) << "Error deleting file " << strerror(errno);
+                success = false;
+            }
+            cur_file_count--;
+        } else {
+            break;
         }
     }
     return success;
@@ -309,6 +324,9 @@
 }
 
 void WifiChip::invalidate() {
+    if (!writeRingbufferFilesInternal()) {
+        LOG(ERROR) << "Error writing files to flash";
+    }
     invalidateAndRemoveAllIfaces();
     legacy_hal_.reset();
     event_cb_handler_.invalidate();