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Date: Tue, 1 Jun 2010 14:20:26 +0200
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: <linux-kernel@...r.kernel.org>,
Per Friden <per.friden@...ricsson.com>,
Jonas Aaberg <jonas.aberg@...ricsson.com>,
Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 01/18] DMAENGINE: ste_dma40: fixed lli_max=1 issue
From: Per Friden <per.friden@...ricsson.com>
Fixed lli_max=1 issue in case of full lcla, currently this case
is not properly handled.
Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
drivers/dma/ste_dma40.c | 62 ++++++++++++++++++++++-------------------------
1 files changed, 29 insertions(+), 33 deletions(-)
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index c426829..4618d6c 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -81,9 +81,10 @@ struct d40_lli_pool {
* lli_len equals one.
* @lli_log: Same as above but for logical channels.
* @lli_pool: The pool with two entries pre-allocated.
- * @lli_len: Number of LLI's in lli_pool
- * @lli_tcount: Number of LLIs processed in the transfer. When equals lli_len
- * then this transfer job is done.
+ * @lli_len: Number of llis of current descriptor.
+ * @lli_count: Number of transfered llis.
+ * @lli_tx_len: Max number of LLIs per transfer, there can be
+ * many transfer for one descriptor.
* @txd: DMA engine struct. Used for among other things for communication
* during a transfer.
* @node: List entry.
@@ -100,8 +101,9 @@ struct d40_desc {
struct d40_log_lli_bidir lli_log;
struct d40_lli_pool lli_pool;
- u32 lli_len;
- u32 lli_tcount;
+ int lli_len;
+ int lli_count;
+ u32 lli_tx_len;
struct dma_async_tx_descriptor txd;
struct list_head node;
@@ -365,11 +367,6 @@ static dma_cookie_t d40_assign_cookie(struct d40_chan *d40c,
return cookie;
}
-static void d40_desc_reset(struct d40_desc *d40d)
-{
- d40d->lli_tcount = 0;
-}
-
static void d40_desc_remove(struct d40_desc *d40d)
{
list_del(&d40d->node);
@@ -738,25 +735,18 @@ static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
d40c->phy_chan->num,
d40d->lli_phy.dst,
d40d->lli_phy.src);
- d40d->lli_tcount = d40d->lli_len;
} else if (d40d->lli_log.dst && d40d->lli_log.src) {
- u32 lli_len;
struct d40_log_lli *src = d40d->lli_log.src;
struct d40_log_lli *dst = d40d->lli_log.dst;
- src += d40d->lli_tcount;
- dst += d40d->lli_tcount;
-
- if (d40d->lli_len <= d40c->base->plat_data->llis_per_log)
- lli_len = d40d->lli_len;
- else
- lli_len = d40c->base->plat_data->llis_per_log;
- d40d->lli_tcount += lli_len;
+ src += d40d->lli_count;
+ dst += d40d->lli_count;
d40_log_lli_write(d40c->lcpa, d40c->lcla.src,
d40c->lcla.dst,
dst, src,
d40c->base->plat_data->llis_per_log);
}
+ d40d->lli_count += d40d->lli_tx_len;
}
static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
@@ -838,7 +828,7 @@ static void dma_tc_handle(struct d40_chan *d40c)
if (d40d == NULL)
return;
- if (d40d->lli_tcount < d40d->lli_len) {
+ if (d40d->lli_count < d40d->lli_len) {
d40_desc_load(d40c, d40d);
/* Start dma job */
@@ -891,7 +881,6 @@ static void dma_tasklet(unsigned long data)
/* Return desc to free-list */
d40_desc_free(d40c, d40d_fin);
} else {
- d40_desc_reset(d40d_fin);
if (!d40d_fin->is_in_client_list) {
d40_desc_remove(d40d_fin);
list_add_tail(&d40d_fin->node, &d40c->client);
@@ -1573,7 +1562,6 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
struct d40_chan *d40c = container_of(chan, struct d40_chan,
chan);
unsigned long flg;
- int lli_max = d40c->base->plat_data->llis_per_log;
spin_lock_irqsave(&d40c->lock, flg);
@@ -1584,10 +1572,13 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
memset(d40d, 0, sizeof(struct d40_desc));
d40d->lli_len = sgl_len;
-
+ d40d->lli_tx_len = d40d->lli_len;
d40d->txd.flags = flags;
if (d40c->log_num != D40_PHY_CHAN) {
+ if (d40d->lli_len > d40c->base->plat_data->llis_per_log)
+ d40d->lli_tx_len = d40c->base->plat_data->llis_per_log;
+
if (sgl_len > 1)
/*
* Check if there is space available in lcla. If not,
@@ -1596,7 +1587,7 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
*/
if (d40_lcla_id_get(d40c,
&d40c->base->lcla_pool) != 0)
- lli_max = 1;
+ d40d->lli_tx_len = 1;
if (d40_pool_lli_alloc(d40d, sgl_len, true) < 0) {
dev_err(&d40c->chan.dev->device,
@@ -1610,7 +1601,8 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
d40d->lli_log.src,
d40c->log_def.lcsp1,
d40c->dma_cfg.src_info.data_width,
- flags & DMA_PREP_INTERRUPT, lli_max,
+ flags & DMA_PREP_INTERRUPT,
+ d40d->lli_tx_len,
d40c->base->plat_data->llis_per_log);
(void) d40_log_sg_to_lli(d40c->lcla.dst_id,
@@ -1619,7 +1611,8 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
d40d->lli_log.dst,
d40c->log_def.lcsp3,
d40c->dma_cfg.dst_info.data_width,
- flags & DMA_PREP_INTERRUPT, lli_max,
+ flags & DMA_PREP_INTERRUPT,
+ d40d->lli_tx_len,
d40c->base->plat_data->llis_per_log);
@@ -1794,6 +1787,7 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
goto err;
}
d40d->lli_len = 1;
+ d40d->lli_tx_len = 1;
d40_log_fill_lli(d40d->lli_log.src,
src,
@@ -1869,7 +1863,6 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
{
dma_addr_t dev_addr = 0;
int total_size;
- int lli_max = d40c->base->plat_data->llis_per_log;
if (d40_pool_lli_alloc(d40d, sg_len, true) < 0) {
dev_err(&d40c->chan.dev->device,
@@ -1878,7 +1871,10 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
}
d40d->lli_len = sg_len;
- d40d->lli_tcount = 0;
+ if (d40d->lli_len <= d40c->base->plat_data->llis_per_log)
+ d40d->lli_tx_len = d40d->lli_len;
+ else
+ d40d->lli_tx_len = d40c->base->plat_data->llis_per_log;
if (sg_len > 1)
/*
@@ -1887,7 +1883,7 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
* in lcpa space.
*/
if (d40_lcla_id_get(d40c, &d40c->base->lcla_pool) != 0)
- lli_max = 1;
+ d40d->lli_tx_len = 1;
if (direction == DMA_FROM_DEVICE) {
dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
@@ -1899,7 +1895,7 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
d40c->dma_cfg.dst_info.data_width,
direction,
flags & DMA_PREP_INTERRUPT,
- dev_addr, lli_max,
+ dev_addr, d40d->lli_tx_len,
d40c->base->plat_data->llis_per_log);
} else if (direction == DMA_TO_DEVICE) {
dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
@@ -1911,7 +1907,7 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
d40c->dma_cfg.dst_info.data_width,
direction,
flags & DMA_PREP_INTERRUPT,
- dev_addr, lli_max,
+ dev_addr, d40d->lli_tx_len,
d40c->base->plat_data->llis_per_log);
} else
return -EINVAL;
@@ -1939,7 +1935,7 @@ static int d40_prep_slave_sg_phy(struct d40_desc *d40d,
}
d40d->lli_len = sgl_len;
- d40d->lli_tcount = 0;
+ d40d->lli_tx_len = sgl_len;
if (direction == DMA_FROM_DEVICE) {
dst_dev_addr = 0;
--
1.6.3.3
--
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