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authorJonas Aaberg <jonas.aberg@stericsson.com>2010-06-20 21:25:46 +0000
committerDan Williams <dan.j.williams@intel.com>2010-06-22 18:01:54 -0700
commit0c32269d813c148194524fc8272f7ec1f7c90e6a (patch)
tree74603b87ce1b4b1fbe8b538a32683c73ea66c6a8 /drivers/dma
parent2292b880e411276d127a020a1c35ca149fcca992 (diff)
downloadlinux-0c32269d813c148194524fc8272f7ec1f7c90e6a.tar.bz2
DMAENGINE: ste_dma40: avoid doing unnessecary suspend
Avoid doing unnessecary suspend when modifying logical channels. Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/ste_dma40.c39
1 files changed, 7 insertions, 32 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index ebffb53c036c..abbc1b627bcc 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -595,6 +595,7 @@ static void d40_config_set_event(struct d40_chan *d40c, bool do_enable)
u32 val;
unsigned long flags;
+ /* Notice, that disable requires the physical channel to be stopped */
if (do_enable)
val = D40_ACTIVATE_EVENTLINE;
else
@@ -740,18 +741,10 @@ static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
static int d40_start(struct d40_chan *d40c)
{
- int err;
-
- if (d40c->log_num != D40_PHY_CHAN) {
- err = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (err)
- return err;
+ if (d40c->log_num != D40_PHY_CHAN)
d40_config_set_event(d40c, true);
- }
-
- err = d40_channel_execute_command(d40c, D40_DMA_RUN);
- return err;
+ return d40_channel_execute_command(d40c, D40_DMA_RUN);
}
static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
@@ -1340,7 +1333,6 @@ static bool d40_is_paused(struct d40_chan *d40c)
void __iomem *active_reg;
u32 status;
u32 event;
- int res;
spin_lock_irqsave(&d40c->lock, flags);
@@ -1359,10 +1351,6 @@ static bool d40_is_paused(struct d40_chan *d40c)
goto _exit;
}
- res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (res != 0)
- goto _exit;
-
if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM)
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
@@ -1379,12 +1367,6 @@ static bool d40_is_paused(struct d40_chan *d40c)
if (status != D40_DMA_RUN)
is_paused = true;
-
- /* Resume the other logical channels if any */
- if (d40_chan_has_events(d40c))
- res = d40_channel_execute_command(d40c,
- D40_DMA_RUN);
-
_exit:
spin_unlock_irqrestore(&d40c->lock, flags);
return is_paused;
@@ -1430,20 +1412,13 @@ static int d40_resume(struct dma_chan *chan)
spin_lock_irqsave(&d40c->lock, flags);
- if (d40c->log_num != D40_PHY_CHAN) {
- res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (res)
- goto out;
-
- /* If bytes left to transfer or linked tx resume job */
- if (d40_residue(d40c) || d40_tx_is_linked(d40c)) {
+ /* If bytes left to transfer or linked tx resume job */
+ if (d40_residue(d40c) || d40_tx_is_linked(d40c)) {
+ if (d40c->log_num != D40_PHY_CHAN)
d40_config_set_event(d40c, true);
- res = d40_channel_execute_command(d40c, D40_DMA_RUN);
- }
- } else if (d40_residue(d40c) || d40_tx_is_linked(d40c))
res = d40_channel_execute_command(d40c, D40_DMA_RUN);
+ }
-out:
spin_unlock_irqrestore(&d40c->lock, flags);
return res;
}