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authorLinus Torvalds <torvalds@linux-foundation.org>2008-03-18 21:34:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-03-18 21:34:48 -0700
commit264e3e889d86e552b4191d69bb60f4f3b383135a (patch)
treefde25f5a73c0ebbb1c19ab213270f0aa43ded9c7
parentd7a0e1f56472db0825e13f9dd39f0ad79b8c8b3e (diff)
parent8d8002f642886ae256a3c5d70fe8aff4faf3631a (diff)
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor fsldma: Fix the DMA halt when using DMA_INTERRUPT async_tx transfer.
-rw-r--r--crypto/async_tx/async_xor.c2
-rw-r--r--drivers/dma/fsldma.c30
-rw-r--r--drivers/dma/fsldma.h1
3 files changed, 32 insertions, 1 deletions
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index 7a9db353f19..1c445c7bdab 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -271,7 +271,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
BUG_ON(src_cnt <= 1);
- if (device) {
+ if (device && src_cnt <= device->max_xor) {
dma_addr_t *dma_src = (dma_addr_t *) src_list;
unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
int i;
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index ad2f938597e..72692309398 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -123,6 +123,11 @@ static dma_addr_t get_ndar(struct fsl_dma_chan *fsl_chan)
return DMA_IN(fsl_chan, &fsl_chan->reg_base->ndar, 64);
}
+static u32 get_bcr(struct fsl_dma_chan *fsl_chan)
+{
+ return DMA_IN(fsl_chan, &fsl_chan->reg_base->bcr, 32);
+}
+
static int dma_is_idle(struct fsl_dma_chan *fsl_chan)
{
u32 sr = get_sr(fsl_chan);
@@ -426,6 +431,9 @@ fsl_dma_prep_interrupt(struct dma_chan *chan)
new->async_tx.cookie = -EBUSY;
new->async_tx.ack = 0;
+ /* Insert the link descriptor to the LD ring */
+ list_add_tail(&new->node, &new->async_tx.tx_list);
+
/* Set End-of-link to the last link descriptor of new list*/
set_ld_eol(fsl_chan, new);
@@ -701,6 +709,23 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
if (stat & FSL_DMA_SR_TE)
dev_err(fsl_chan->dev, "Transfer Error!\n");
+ /* Programming Error
+ * The DMA_INTERRUPT async_tx is a NULL transfer, which will
+ * triger a PE interrupt.
+ */
+ if (stat & FSL_DMA_SR_PE) {
+ dev_dbg(fsl_chan->dev, "event: Programming Error INT\n");
+ if (get_bcr(fsl_chan) == 0) {
+ /* BCR register is 0, this is a DMA_INTERRUPT async_tx.
+ * Now, update the completed cookie, and continue the
+ * next uncompleted transfer.
+ */
+ fsl_dma_update_completed_cookie(fsl_chan);
+ fsl_chan_xfer_ld_queue(fsl_chan);
+ }
+ stat &= ~FSL_DMA_SR_PE;
+ }
+
/* If the link descriptor segment transfer finishes,
* we will recycle the used descriptor.
*/
@@ -841,6 +866,11 @@ static int fsl_dma_self_test(struct fsl_dma_chan *fsl_chan)
tx3 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 4, 0);
async_tx_ack(tx3);
+ /* Interrupt tx test */
+ tx1 = fsl_dma_prep_interrupt(chan);
+ async_tx_ack(tx1);
+ cookie = fsl_dma_tx_submit(tx1);
+
/* Test exchanging the prepared tx sort */
cookie = fsl_dma_tx_submit(tx3);
cookie = fsl_dma_tx_submit(tx2);
diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index ba78c42121b..fddd6aee2a6 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -40,6 +40,7 @@
#define FSL_DMA_MR_EOTIE 0x00000080
#define FSL_DMA_SR_CH 0x00000020
+#define FSL_DMA_SR_PE 0x00000010
#define FSL_DMA_SR_CB 0x00000004
#define FSL_DMA_SR_TE 0x00000080
#define FSL_DMA_SR_EOSI 0x00000002