* [PATCH v2] dmaengine: imx-sdma: refine to load context only once
@ 2019-01-08 12:00 Robin Gong
2019-01-08 17:03 ` Vinod Koul
0 siblings, 1 reply; 2+ messages in thread
From: Robin Gong @ 2019-01-08 12:00 UTC (permalink / raw)
To: vkoul; +Cc: dmaengine, linux-kernel, dl-linux-imx
The context loaded only one time before channel running,but
currently sdma_config_channel() and dma_prep_* duplicated with
sdma_load_context(), so refine it to load context only one time
before channel running and reload after the channel terminated.
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
---
drivers/dma/imx-sdma.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index a2b0a0e..015c17a 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -377,6 +377,7 @@ struct sdma_channel {
unsigned long watermark_level;
u32 shp_addr, per_addr;
enum dma_status status;
+ bool context_loaded;
struct imx_dma_data data;
struct work_struct terminate_worker;
};
@@ -970,6 +971,9 @@ static int sdma_load_context(struct sdma_channel *sdmac)
int ret;
unsigned long flags;
+ if (sdmac->context_loaded)
+ return 0;
+
if (sdmac->direction == DMA_DEV_TO_MEM)
load_address = sdmac->pc_from_device;
else if (sdmac->direction == DMA_DEV_TO_DEV)
@@ -1012,6 +1016,8 @@ static int sdma_load_context(struct sdma_channel *sdmac)
spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
+ sdmac->context_loaded = true;
+
return ret;
}
@@ -1051,6 +1057,7 @@ static void sdma_channel_terminate_work(struct work_struct *work)
sdmac->desc = NULL;
spin_unlock_irqrestore(&sdmac->vc.lock, flags);
vchan_dma_desc_free_list(&sdmac->vc, &head);
+ sdmac->context_loaded = false;
}
static int sdma_disable_channel_async(struct dma_chan *chan)
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] dmaengine: imx-sdma: refine to load context only once
2019-01-08 12:00 [PATCH v2] dmaengine: imx-sdma: refine to load context only once Robin Gong
@ 2019-01-08 17:03 ` Vinod Koul
0 siblings, 0 replies; 2+ messages in thread
From: Vinod Koul @ 2019-01-08 17:03 UTC (permalink / raw)
To: Robin Gong; +Cc: dmaengine, linux-kernel, dl-linux-imx
On 08-01-19, 12:00, Robin Gong wrote:
> The context loaded only one time before channel running,but
> currently sdma_config_channel() and dma_prep_* duplicated with
> sdma_load_context(), so refine it to load context only one time
> before channel running and reload after the channel terminated.
Applied, thanks
--
~Vinod
^ permalink raw reply [flat|nested] 2+ messages in thread
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