openwrt/target/linux/layerscape/patches-5.4/806-dma-0019-dmaengine-fsl-edma-calculate-the-real-count-for-slav.patch

From 7b126c5fbddf179c7d2c2393100329aa45cd8ac4 Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
Date: Fri, 9 Aug 2019 15:14:08 +0800
Subject: [PATCH] dmaengine: fsl-edma: calculate the real count for slave sg

Calculate the rela count for current slave sg after eDMA stop.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
---
 drivers/dma/fsl-edma-common.c | 11 ++++++++++-
 drivers/dma/fsl-edma-common.h |  2 ++
 drivers/dma/fsl-edma.c        |  1 +
 3 files changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -305,6 +305,11 @@ static size_t fsl_edma_desc_residue(stru
 	return len;
 }
 
+void fsl_edma_get_realcnt(struct fsl_edma_chan *fsl_chan)
+{
+	fsl_chan->chn_real_count = fsl_edma_desc_residue(fsl_chan, NULL, true);
+}
+
 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 		dma_cookie_t cookie, struct dma_tx_state *txstate)
 {
@@ -314,8 +319,12 @@ enum dma_status fsl_edma_tx_status(struc
 	unsigned long flags;
 
 	status = dma_cookie_status(chan, cookie, txstate);
-	if (status == DMA_COMPLETE)
+	if (status == DMA_COMPLETE) {
+		spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+		txstate->residue = fsl_chan->chn_real_count;
+		spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 		return status;
+	}
 
 	if (!txstate)
 		return fsl_chan->status;
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -126,6 +126,7 @@ struct fsl_edma_chan {
 	u32				dma_dev_size;
 	enum dma_data_direction		dma_dir;
 	char				chan_name[16];
+	u32				chn_real_count;
 };
 
 struct fsl_edma_desc {
@@ -229,6 +230,7 @@ int fsl_edma_pause(struct dma_chan *chan
 int fsl_edma_resume(struct dma_chan *chan);
 int fsl_edma_slave_config(struct dma_chan *chan,
 				 struct dma_slave_config *cfg);
+void fsl_edma_get_realcnt(struct fsl_edma_chan *fsl_chan);
 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 		dma_cookie_t cookie, struct dma_tx_state *txstate);
 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -53,6 +53,7 @@ static irqreturn_t fsl_edma_tx_handler(i
 			}
 
 			if (!fsl_chan->edesc->iscyclic) {
+				fsl_edma_get_realcnt(fsl_chan);
 				list_del(&fsl_chan->edesc->vdesc.node);
 				vchan_cookie_complete(&fsl_chan->edesc->vdesc);
 				fsl_chan->edesc = NULL;