Merge pull request #342 from RanderWang/byt

dma: fix dma issue on BYT

Author: lgirdwood

src/drivers/dw-dma.c

@@ -119,6 +119,7 @@
 #define INT_UNMASK_ALL			0xFFFF
 #define CHAN_ENABLE(chan)		(0x101 << chan)
 #define CHAN_DISABLE(chan)		(0x100 << chan)
+#define CHAN_MASK(chan)		(0x1 << chan)
 
 #define DW_CFG_CH_SUSPEND		0x100
 #define DW_CFG_CH_FIFO_EMPTY		0x200
@@ -474,6 +475,31 @@ static int dw_dma_pause(struct dma *dma, int channel)
 	return 0;
 }
 
+#if defined CONFIG_BAYTRAIL || defined CONFIG_CHERRYTRAIL
+static int dw_dma_stop(struct dma *dma, int channel)
+{
+	struct dma_pdata *p = dma_get_drvdata(dma);
+	int ret = 0;
+	uint32_t flags;
+	uint32_t val = 0;
+
+	spin_lock_irq(&dma->lock, flags);
+
+	trace_dma("DDi");
+
+	ret = poll_for_register_delay(dma_base(dma) + DW_DMA_CHAN_EN,
+				      CHAN_MASK(channel), val,
+				      PLATFORM_DMA_TIMEOUT);
+	if (ret < 0)
+		trace_dma_error("esp");
+
+	dw_write(dma, DW_CLEAR_BLOCK, 0x1 << channel);
+	p->chan[channel].status = COMP_STATE_PREPARE;
+
+	spin_unlock_irq(&dma->lock, flags);
+	return ret;
+}
+#else
 static int dw_dma_stop(struct dma *dma, int channel)
 {
 	struct dma_pdata *p = dma_get_drvdata(dma);
@@ -508,6 +534,7 @@ static int dw_dma_stop(struct dma *dma, int channel)
 	spin_unlock_irq(&dma->lock, flags);
 	return ret;
 }
+#endif
 
 /* fill in "status" with current DMA channel state and position */
 static int dw_dma_status(struct dma *dma, int channel,

src/include/sof/wait.h

@@ -36,6 +36,7 @@
 #include <stdint.h>
 #include <errno.h>
 #include <arch/wait.h>
+#include <sof/io.h>
 #include <sof/debug.h>
 #include <sof/work.h>
 #include <sof/timer.h>
@@ -185,4 +186,27 @@ static inline int poll_for_completion_delay(completion_t *comp, uint64_t us)
 	return 0;
 }
 
+static inline int poll_for_register_delay(uint32_t reg,
+					  uint32_t mask,
+					  uint32_t val, uint64_t us)
+{
+	uint64_t tick = clock_us_to_ticks(CLK_CPU, us);
+	uint32_t tries = DEFAULT_TRY_TIMES;
+	uint64_t delta = tick / tries;
+
+	if (!delta) {
+		delta = us;
+		tries = 1;
+	}
+
+	while ((io_reg_read(reg) & mask) != val) {
+		if (!tries--) {
+			trace_error(TRACE_CLASS_WAIT, "ewt");
+			return -EIO;
+		}
+		wait_delay(delta);
+	}
+	return 0;
+}
+
 #endif