diff --git a/libraries/AP_HAL_ChibiOS/hwdef/common/spi_hook.h b/libraries/AP_HAL_ChibiOS/hwdef/common/spi_hook.h
index a1971ba5f6..124e93415f 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/common/spi_hook.h
+++ b/libraries/AP_HAL_ChibiOS/hwdef/common/spi_hook.h
@@ -9,6 +9,8 @@ extern "C" {
 #if HAL_USE_MMC_SPI == TRUE
 void spiStartHook(SPIDriver *spip, const SPIConfig *config);
 void spiStopHook(SPIDriver *spip);
+void spiAcquireBusHook(SPIDriver *spip);
+void spiReleaseBusHook(SPIDriver *spip);
 void spiSelectHook(SPIDriver *spip);
 void spiUnselectHook(SPIDriver *spip);
 void spiIgnoreHook(SPIDriver *spip,size_t n);
diff --git a/libraries/AP_HAL_ChibiOS/sdcard.cpp b/libraries/AP_HAL_ChibiOS/sdcard.cpp
index eaedca7214..32fc3b3dfc 100644
--- a/libraries/AP_HAL_ChibiOS/sdcard.cpp
+++ b/libraries/AP_HAL_ChibiOS/sdcard.cpp
@@ -213,6 +213,22 @@ void spiStopHook(SPIDriver *spip)
 {
 }
 
+__RAMFUNC__ void spiAcquireBusHook(SPIDriver *spip)
+{
+    if (sdcard_running) {
+        ChibiOS::SPIDevice *devptr = static_cast<ChibiOS::SPIDevice*>(device.get());
+        devptr->acquire_bus(true, true);
+    }
+}
+
+__RAMFUNC__ void spiReleaseBusHook(SPIDriver *spip)
+{
+    if (sdcard_running) {
+        ChibiOS::SPIDevice *devptr = static_cast<ChibiOS::SPIDevice*>(device.get());
+        devptr->acquire_bus(false, true);
+    }
+}
+
 __RAMFUNC__ void spiSelectHook(SPIDriver *spip)
 {
     if (sdcard_running) {