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-rw-r--r--drivers/usb/musb/cppi_dma.c33
1 files changed, 10 insertions, 23 deletions
diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index a44a450c860..3c69a76ec39 100644
--- a/drivers/usb/musb/cppi_dma.c
+++ b/drivers/usb/musb/cppi_dma.c
@@ -1191,8 +1191,13 @@ irqreturn_t cppi_interrupt(int irq, void *dev_id)
bd = tx_ch->head;
+ /*
+ * If Head is null then this could mean that a abort interrupt
+ * that needs to be acknowledged.
+ */
if (NULL == bd) {
DBG(1, "null BD\n");
+ tx_ram->tx_complete = 0;
continue;
}
@@ -1412,15 +1417,6 @@ static int cppi_channel_abort(struct dma_channel *channel)
if (cppi_ch->transmit) {
struct cppi_tx_stateram __iomem *tx_ram;
- int enabled;
-
- /* mask interrupts raised to signal teardown complete. */
- enabled = musb_readl(tibase, DAVINCI_TXCPPI_INTENAB_REG)
- & (1 << cppi_ch->index);
- if (enabled)
- musb_writel(tibase, DAVINCI_TXCPPI_INTCLR_REG,
- (1 << cppi_ch->index));
-
/* REVISIT put timeouts on these controller handshakes */
cppi_dump_tx(6, cppi_ch, " (teardown)");
@@ -1435,7 +1431,6 @@ static int cppi_channel_abort(struct dma_channel *channel)
do {
value = musb_readl(&tx_ram->tx_complete, 0);
} while (0xFFFFFFFC != value);
- musb_writel(&tx_ram->tx_complete, 0, 0xFFFFFFFC);
/* FIXME clean up the transfer state ... here?
* the completion routine should get called with
@@ -1448,23 +1443,15 @@ static int cppi_channel_abort(struct dma_channel *channel)
musb_writew(regs, MUSB_TXCSR, value);
musb_writew(regs, MUSB_TXCSR, value);
- /* While we scrub the TX state RAM, ensure that we clean
- * up any interrupt that's currently asserted:
+ /*
* 1. Write to completion Ptr value 0x1(bit 0 set)
* (write back mode)
- * 2. Write to completion Ptr value 0x0(bit 0 cleared)
- * (compare mode)
- * Value written is compared(for bits 31:2) and when
- * equal, interrupt is deasserted.
+ * 2. Wait for abort interrupt and then put the channel in
+ * compare mode by writing 1 to the tx_complete register.
*/
cppi_reset_tx(tx_ram, 1);
- musb_writel(&tx_ram->tx_complete, 0, 0);
-
- /* re-enable interrupt */
- if (enabled)
- musb_writel(tibase, DAVINCI_TXCPPI_INTENAB_REG,
- (1 << cppi_ch->index));
-
+ cppi_ch->head = 0;
+ musb_writel(&tx_ram->tx_complete, 0, 1);
cppi_dump_tx(5, cppi_ch, " (done teardown)");
/* REVISIT tx side _should_ clean up the same way