[PATCH v1] dmaengine: imx-sdma: refine to load context only once

[PATCH v1] dmaengine: imx-sdma: refine to load context only once

[Robin Gong]

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

Re: [PATCH v1] dmaengine: imx-sdma: refine to load context only once

[Vinod Koul]

On 06-12-18, 06:36, Robin Gong wrote:
> The context loaded only one time before channel running,but
                                                        ^^
space after comma please

> 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.

I was going to apply it, but it fails to apply for me, please rebase and
send

-- 
~Vinod

RE: [PATCH v1] dmaengine: imx-sdma: refine to load context only once

[Robin Gong]

Hi Vinod,
	I have sent v2 after rebase. Please have a try. 

> -----Original Message-----
> From: Vinod Koul <vkoul@kernel.org>
> Sent: 2019年1月4日 23:15
> To: Robin Gong <yibin.gong@nxp.com>
> Cc: dan.j.williams@intel.com; kernel@pengutronix.de;
> dmaengine@vger.kernel.org; linux-kernel@vger.kernel.org; dl-linux-imx
> <linux-imx@nxp.com>
> Subject: Re: [PATCH v1] dmaengine: imx-sdma: refine to load context only once
> 
> On 06-12-18, 06:36, Robin Gong wrote:
> > The context loaded only one time before channel running,but
>                                                         ^^ space
> after comma please
> 
> > 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.
> 
> I was going to apply it, but it fails to apply for me, please rebase and send
> 
> --
> ~Vinod