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dmaengine: hsu: remove redundant pieces of code 

There are few places where the implemented pieces of code are not needed, i.e.:
- direction can't be wrong in hsu_dma_chan_start()
- desc->active set to 0 by kzalloc
- DMAEngine is NULL-aware when call ->device_alloc_chan_resources()

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Andy Shevchenko 2015-03-16 10:53:57 +02:00 committed by Greg Kroah-Hartman
parent 90b9aacf91
commit 4bb82458ec
1 changed files with 2 additions and 11 deletions
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13
drivers/dma/hsu/hsu.c
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@ -58,7 +58,7 @@ static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc)
{
struct dma_slave_config *config = &hsuc->config;
struct hsu_dma_desc *desc = hsuc->desc;
u32 bsr, mtsr;
u32 bsr = 0, mtsr = 0; /* to shut the compiler up */
u32 dcr = HSU_CH_DCR_CHSOE | HSU_CH_DCR_CHEI;
unsigned int i, count;
@ -68,9 +68,6 @@ static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc)
} else if (hsuc->direction == DMA_DEV_TO_MEM) {
bsr = config->src_maxburst;
mtsr = config->src_addr_width;
} else {
/* Not supported direction */
return;
}
hsu_chan_disable(hsuc);
@ -243,7 +240,7 @@ static struct dma_async_tx_descriptor *hsu_dma_prep_slave_sg(
desc->nents = sg_len;
desc->direction = direction;
desc->active = 0;
/* desc->active = 0 by kzalloc */
desc->status = DMA_IN_PROGRESS;
return vchan_tx_prep(&hsuc->vchan, &desc->vdesc, flags);
@ -396,11 +393,6 @@ static int hsu_dma_terminate_all(struct dma_chan *chan)
return 0;
}
static int hsu_dma_alloc_chan_resources(struct dma_chan *chan)
{
return 0;
}
static void hsu_dma_free_chan_resources(struct dma_chan *chan)
{
vchan_free_chan_resources(to_virt_chan(chan));
@ -453,7 +445,6 @@ int hsu_dma_probe(struct hsu_dma_chip *chip)
dma_cap_set(DMA_SLAVE, hsu->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, hsu->dma.cap_mask);
hsu->dma.device_alloc_chan_resources = hsu_dma_alloc_chan_resources;
hsu->dma.device_free_chan_resources = hsu_dma_free_chan_resources;
hsu->dma.device_prep_slave_sg = hsu_dma_prep_slave_sg;