dma: mxs-dma: Fix channel reset hardware bug

This is no official errata, but I noticed that the channel reset may
stop working if the DMA state engine is in the READ_FLUSH state.

This patch uses the channel debug1 register to wait for the DMA
statemachine to leave the READ_FLUSH state. After that we can continue
to reset the channel.

Tested on i.MX28.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 27 insertions, 2 deletions

diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index 083e7f1a94f0..530267068061 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -60,6 +60,7 @@
         (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x080 : 0x140) + (n) * 0x70)
 #define HW_APBHX_CHn_BAR(d, n) \
         (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x070 : 0x130) + (n) * 0x70)
+#define HW_APBX_CHn_DEBUG1(d, n) (0x150 + (n) * 0x70)
 
 /*
  * ccw bits definitions
@@ -204,12 +205,36 @@ static void mxs_dma_reset_chan(struct mxs_dma_chan *mxs_chan)
         struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
         int chan_id = mxs_chan->chan.chan_id;
 
-        if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma))
+        if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) {
                 writel(1 << (chan_id + BP_APBH_CTRL0_RESET_CHANNEL),
                         mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET);
-        else
+        } else {
+                unsigned long elapsed = 0;
+                const unsigned long max_wait = 50000; /* 50ms */
+                void __iomem *reg_dbg1 = mxs_dma->base +
+                                HW_APBX_CHn_DEBUG1(mxs_dma, chan_id);
+
+                /*
+                 * On i.MX28 APBX, the DMA channel can stop working if we reset
+                 * the channel while it is in READ_FLUSH (0x08) state.
+                 * We wait here until we leave the state. Then we trigger the
+                 * reset. Waiting a maximum of 50ms, the kernel shouldn't crash
+                 * because of this.
+                 */
+                while ((readl(reg_dbg1) & 0xf) == 0x8 && elapsed < max_wait) {
+                        udelay(100);
+                        elapsed += 100;
+                }
+
+                if (elapsed >= max_wait)
+                        dev_err(&mxs_chan->mxs_dma->pdev->dev,
+                                        "Failed waiting for the DMA channel %d to leave state READ_FLUSH, trying to reset channel in READ_FLUSH state now\n",
+                                        chan_id);
+
+
                 writel(1 << (chan_id + BP_APBHX_CHANNEL_CTRL_RESET_CHANNEL),
                         mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_SET);
+        }
 }
 
 static void mxs_dma_enable_chan(struct mxs_dma_chan *mxs_chan)