backport SDIO Fix - no busy waiting

nuttx/arch/arm/src/stm32/stm32_sdio.c

@@ -399,6 +399,9 @@ static void stm32_endtransfer(struct stm32_dev_s *priv, sdio_eventset_t wkupeven
 /* Interrupt Handling *******************************************************/
 
 static int  stm32_interrupt(int irq, void *context);
+#ifdef CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE
+static int  stm32_rdyinterrupt(int irq, void *context);
+#endif
 
 /* SDIO interface methods ***************************************************/
 
@@ -611,12 +614,40 @@ static void stm32_configwaitints(struct stm32_dev_s *priv, uint32_t waitmask,
                                  sdio_eventset_t wkupevent)
 {
   irqstate_t flags;
+#ifdef CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE
+  int pinset;
+#endif
 
   /* Save all of the data and set the new interrupt mask in one, atomic
    * operation.
    */
-
   flags = irqsave();
+
+#ifdef CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE
+  if ((waitmask & SDIOWAIT_WRCOMPLETE) != 0)
+    {
+
+      /* Do not use this in STM32_SDIO_MASK register */
+
+      waitmask &= !SDIOWAIT_WRCOMPLETE;
+
+      pinset = GPIO_SDIO_D0 & (GPIO_PORT_MASK|GPIO_PIN_MASK);
+      pinset |= (GPIO_INPUT|GPIO_FLOAT|GPIO_EXTI);
+
+      /* Arm the SDIO_D Ready and install Isr */
+
+      stm32_gpiosetevent(pinset, true, false, false, stm32_rdyinterrupt);
+    }
+
+  /* Disarm SDIO_D ready */
+
+  if ((wkupevent & SDIOWAIT_WRCOMPLETE) != 0)
+    {
+	  stm32_gpiosetevent(GPIO_SDIO_D0, false, false, false , NULL);
+	  stm32_configgpio(GPIO_SDIO_D0);
+
+    }
+#endif
   priv->waitevents = waitevents;
   priv->wkupevent  = wkupevent;
   priv->waitmask   = waitmask;
@@ -1229,7 +1260,28 @@ static void stm32_endtransfer(struct stm32_dev_s *priv, sdio_eventset_t wkupeven
 /****************************************************************************
  * Interrrupt Handling
  ****************************************************************************/
+#ifdef CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE
+/****************************************************************************
+ * Name: stm32_rdyinterrupt
+ *
+ * Description:
+ *   SDIO ready interrupt handler
+ *
+ * Input Parameters:
+ *   dev - An instance of the SDIO device interface
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
 
+static int stm32_rdyinterrupt(int irq, void *context)
+{
+  struct stm32_dev_s *priv = &g_sdiodev;
+  stm32_endwait(priv, SDIOWAIT_WRCOMPLETE);
+  return OK;
+}
+#endif
 /****************************************************************************
  * Name: stm32_interrupt
  *
@@ -2228,6 +2280,14 @@ static void stm32_waitenable(FAR struct sdio_dev_s *dev,
    * interrupts.
    */
 
+#if defined(CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE)
+  if ((eventset & SDIOWAIT_WRCOMPLETE) != 0)
+    {
+      waitmask = SDIOWAIT_WRCOMPLETE;
+    }
+  else
+    {
+#endif
   waitmask = 0;
   if ((eventset & SDIOWAIT_CMDDONE) != 0)
     {
@@ -2247,6 +2307,9 @@ static void stm32_waitenable(FAR struct sdio_dev_s *dev,
   /* Enable event-related interrupts */
 
   putreg32(SDIO_WAITALL_ICR, STM32_SDIO_ICR);
+#if defined(CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE)
+   }
+#endif
   stm32_configwaitints(priv, waitmask, eventset, 0);
 }
 
@@ -2316,6 +2379,20 @@ static sdio_eventset_t stm32_eventwait(FAR struct sdio_dev_s *dev,
          }
     }
 
+#if defined(CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE)
+  if ((priv->waitevents & SDIOWAIT_WRCOMPLETE) != 0)
+    {
+
+      /* Atomically read pin to see if ready (true) and determine if ISR fired
+      * If Pin is ready and if ISR did NOT fire end the wait here
+      */
+
+      if (stm32_gpioread(GPIO_SDIO_D0) && ((priv->wkupevent & SDIOWAIT_WRCOMPLETE) == 0))
+        {
+          stm32_endwait(priv, SDIOWAIT_WRCOMPLETE);
+        }
+    }
+#endif
   /* Loop until the event (or the timeout occurs). Race conditions are avoided
    * by calling stm32_waitenable prior to triggering the logic that will cause
    * the wait to terminate.  Under certain race conditions, the waited-for

nuttx/drivers/mmcsd/Kconfig

@@ -32,11 +32,27 @@ config MMCSD_MMCSUPPORT
 		Enable support for MMC cards
 
 config MMCSD_HAVECARDDETECT
-	bool "MMC/SD card detection"
-	default y
-	---help---
-		SDIO driver card detection is
-		100% accurate
+    bool "MMC/SD card detection"
+    default y
+    ---help---
+        SDIO driver card detection is
+        100% accurate
+
+config MMCSD_HAVE_SDIOWAIT_WRCOMPLETE
+    bool "Use SDIO_D Busy to detect Write Complete"
+    default n
+    ---help---
+        SDIO driver will use SDIO_D Busy signaling to detect Write Complete.
+        This option when selected, will enable the MMCSD driver to use the
+        underlying (stm32_sdio only) drivers implementation of the SD specs
+        SDIO_D Busy signaling to detect Write Complete. This will avoid
+        potentially very long (600Ms+) busy waiting in the MMCSD driver.
+        To implement SDIO_D Busy signaling, the underlying driver must
+        be capable of switching the GPIO_SDIO_D0 to be a rising edge sensitive
+        interrupt pin. It must then, condition that pin to detect the rising edge
+        on recipet of SDWAIT_WRCOMPLETE in the SDIO_WAITENABLE call and
+        return it back to regular SDIO mode, when either the ISR fires or pin is
+        found to be high in the SDIO_EVENTWAIT call.
 
 config MMCSD_SPI
 	bool "MMC/SD SPI transfer support"

nuttx/drivers/mmcsd/mmcsd_sdio.c

@@ -71,6 +71,9 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
+#if !defined(MMCSD_BLOCK_WDATADELAY)
+# define MMCSD_BLOCK_WDATADELAY 200
+#endif
 
 /* The maximum number of references on the driver (because a uint8_t is used.
  * Use a larger type if more references are needed.
@@ -1142,6 +1145,15 @@ static int mmcsd_transferready(FAR struct mmcsd_state_s *priv)
    * the TRANSFER state when the card completes the WRITE operation.
    */
 
+#if defined(CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE)
+  ret = mmcsd_eventwait(priv, SDIOWAIT_TIMEOUT|SDIOWAIT_ERROR, MMCSD_BLOCK_WDATADELAY);
+
+  if (ret != OK)
+    {
+      fdbg("ERROR: mmcsd_eventwait for transferready failed: %d\n", ret);
+    }
+#endif
+
   starttime = clock_systimer();
   do
     {
@@ -1707,6 +1719,14 @@ static ssize_t mmcsd_writesingle(FAR struct mmcsd_state_s *priv,
       return ret;
     }
 
+#if defined(CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE)
+
+  /* Arm the write complete detection with timeout */
+
+  SDIO_WAITENABLE(priv->dev, SDIOWAIT_WRCOMPLETE|SDIOWAIT_TIMEOUT);
+
+#endif
+
   /* On success, return the number of blocks written */
 
   return 1;

nuttx/include/nuttx/sdio.h

@@ -62,9 +62,12 @@
 #define SDIOWAIT_TRANSFERDONE  (1 << 2) /* Bit 2: Data transfer/DMA done */
 #define SDIOWAIT_TIMEOUT       (1 << 3) /* Bit 3: Timeout */
 #define SDIOWAIT_ERROR         (1 << 4) /* Bit 4: Some other error occurred */
-
-#define SDIOWAIT_ALLEVENTS     0x1f
-
+#if defined(CONFIG_MMCSD_HAVE_SDIOWAIT_WRCOMPLETE)
+#define SDIOWAIT_WRCOMPLETE    (1 << 5) /* Bit 5: Hardware Write Completion */
+# define SDIOWAIT_ALLEVENTS     0x3f
+#else
+# define SDIOWAIT_ALLEVENTS     0x1f
+#endif
 /* Media events are used for enable/disable registered event callbacks */
 
 #define SDIOMEDIA_EJECTED       (1 << 0) /* Bit 0: Mmedia removed */