dma: cppi41: handle 0-length packets

When a 0-length packet is received on the bus, desc->pd0 yields 1,
which confuses the driver's users. This information is clearly wrong
and not in accordance to the datasheet, but it's been observed on an
AM335x board, very reproducible.

Fix this by looking at bit 19 in PD2 of the completed packet. This bit
will tell us if a zero-length packet was received on a queue. If it's
set, ignore the value in PD0 and report a total length of 0 instead.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
index d028f36ae655ad56b7afb95a8c4252d096596d5f..8f8b0b608875642e6ee60877a805f61a33e7d8bb 100644 (file)
--- a/drivers/dma/cppi41.c
+++ b/drivers/dma/cppi41.c
@@ -86,6 +86,9 @@
 
 #define USBSS_IRQ_PD_COMP      (1 <<  2)
 
+/* Packet Descriptor */
+#define PD2_ZERO_LENGTH                (1 << 19)
+
 struct cppi41_channel {
        struct dma_chan chan;
        struct dma_async_tx_descriptor txd;
@@ -307,7 +310,7 @@ static irqreturn_t cppi41_irq(int irq, void *data)
                        __iormb();
 
                while (val) {
-                       u32 desc;
+                       u32 desc, len;
 
                        q_num = __fls(val);
                        val &= ~(1 << q_num);
@@ -319,9 +322,13 @@ static irqreturn_t cppi41_irq(int irq, void *data)
                                                q_num, desc);
                                continue;
                        }
-                       c->residue = pd_trans_len(c->desc->pd6) -
-                               pd_trans_len(c->desc->pd0);
 
+                       if (c->desc->pd2 & PD2_ZERO_LENGTH)
+                               len = 0;
+                       else
+                               len = pd_trans_len(c->desc->pd0);
+
+                       c->residue = pd_trans_len(c->desc->pd6) - len;
                        dma_cookie_complete(&c->txd);
                        c->txd.callback(c->txd.callback_param);
                }