3 files changed, 15 insertions, 0 deletions
diff --git a/os/hal/platforms/STM32/mac_lld.c b/os/hal/platforms/STM32/mac_lld.c
index 2a91009c5..eb87d579d 100644
--- a/os/hal/platforms/STM32/mac_lld.c
+++ b/os/hal/platforms/STM32/mac_lld.c
@@ -306,8 +306,10 @@ void mac_lld_start(MACDriver *macp) {
   /* ISR vector enabled.*/
   nvicEnableVector(ETH_IRQn, CORTEX_PRIORITY_MASK(STM32_ETH1_IRQ_PRIORITY));
 
+#if STM32_ETH1_CHANGE_PHY_STATE
   /* PHY in power up mode.*/
   mii_write(macp, MII_BMCR, mii_read(macp, MII_BMCR) & ~BMCR_PDOWN);
+#endif
 
   /* MAC configuration.*/
   ETH->MACFFR    = 0;
@@ -361,8 +363,10 @@ void mac_lld_start(MACDriver *macp) {
 void mac_lld_stop(MACDriver *macp) {
 
   if (macp->state != MAC_STOP) {
+#if STM32_ETH1_CHANGE_PHY_STATE
     /* PHY in power down mode until the driver will be restarted.*/
     mii_write(macp, MII_BMCR, mii_read(macp, MII_BMCR) | BMCR_PDOWN);
+#endif
 
     /* MAC and DMA stopped.*/
     ETH->MACCR    = 0;
diff --git a/os/hal/platforms/STM32/mac_lld.h b/os/hal/platforms/STM32/mac_lld.h
index 32ef3ba79..9709bcdb7 100644
--- a/os/hal/platforms/STM32/mac_lld.h
+++ b/os/hal/platforms/STM32/mac_lld.h
@@ -155,6 +155,13 @@
 #endif
 
 /**
+ * @brief   Change the PHY power state inside the driver.
+ */
+#if !defined(STM32_ETH1_CHANGE_PHY_STATE) || defined(__DOXYGEN__)
+#define STM32_ETH1_CHANGE_PHY_STATE TRUE
+#endif
+
+/**
  * @brief   ETHD1 interrupt priority level setting.
  */
 #if !defined(STM32_ETH1_IRQ_PRIORITY) || defined(__DOXYGEN__)
diff --git a/readme.txt b/readme.txt
index 51ebeb21b..f91c20890 100644
--- a/readme.txt
+++ b/readme.txt
@@ -83,6 +83,8 @@
 *****************************************************************************
 
 *** 2.5.1 ***
+- FIX: Fixed Ethernet PHY power down scheme prevents using LAN8720A (bug
+  3570335).
 - FIX: Fixed FatFS won't compile with _FS_REENTRANT enabled (bug 3570135)
   (backported to 2.4.3).
 - FIX: Fixed mmc_spi.c won't compile due to misplaced declaration (bug
@@ -97,6 +99,8 @@
   (backported to 2.4.3).
 - FIX: Fixed STM8L, cosmic compiler: c_lreg not saved (bug 3566342)(backported
   to 2.2.10 and 2.4.3).
+- NEW: Added a new option STM32_ETH1_CHANGE_PHY_STATE to the STM32 MAC driver,
+  this change is connected to bug 3570335.
 - NEW: Modified the CAN drivers to use the new event flags mechanism, the
   previous flags handling has been removed.
 - NEW: Modified serial and serial_usb drivers to use the new event flags