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Commit 4702d524 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

dw_dmac: return proper residue value 



Currently the driver returns full length of the active descriptor which is
wrong. We have to go throught the active descriptor and substract the length of
each sent children in the chain from the total length along with the actual
data in the DMA channel registers.

The cyclic case is not handled by this patch due to len field in the descriptor
structure is left untouched by the original code.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 176dcec5

drivers/dma/dw_dmac.c

+45 −2
Original line number Diff line number Diff line
@@ -282,6 +282,7 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first) 


		dwc_initialize(dwc);



		dwc->residue = first->total_len;

		dwc->tx_node_active = &first->tx_list;



		/* Submit first block */
@@ -385,6 +386,15 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc) 
		dwc_descriptor_complete(dwc, desc, true);

}



/* Returns how many bytes were already received from source */

static inline u32 dwc_get_sent(struct dw_dma_chan *dwc)

{

	u32 ctlhi = channel_readl(dwc, CTL_HI);

	u32 ctllo = channel_readl(dwc, CTL_LO);



	return (ctlhi & DWC_CTLH_BLOCK_TS_MASK) * (1 << (ctllo >> 4 & 7));

}



static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)

{

	dma_addr_t llp;
@@ -412,6 +422,12 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) 


			head = &desc->tx_list;

			if (active != head) {

				/* Update desc to reflect last sent one */

				if (active != head->next)

					desc = to_dw_desc(active->prev);



				dwc->residue -= desc->len;



				child = to_dw_desc(active);



				/* Submit next block */
@@ -424,6 +440,9 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) 
			/* We are done here */

			clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);

		}



		dwc->residue = 0;



		spin_unlock_irqrestore(&dwc->lock, flags);



		dwc_complete_all(dw, dwc);
@@ -431,6 +450,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) 
	}



	if (list_empty(&dwc->active_list)) {

		dwc->residue = 0;

		spin_unlock_irqrestore(&dwc->lock, flags);

		return;

	}
@@ -445,6 +465,9 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) 
			(unsigned long long)llp);



	list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {

		/* initial residue value */

		dwc->residue = desc->total_len;



		/* check first descriptors addr */

		if (desc->txd.phys == llp) {

			spin_unlock_irqrestore(&dwc->lock, flags);
@@ -454,16 +477,21 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) 
		/* check first descriptors llp */

		if (desc->lli.llp == llp) {

			/* This one is currently in progress */

			dwc->residue -= dwc_get_sent(dwc);

			spin_unlock_irqrestore(&dwc->lock, flags);

			return;

		}



		list_for_each_entry(child, &desc->tx_list, desc_node)

		dwc->residue -= desc->len;

		list_for_each_entry(child, &desc->tx_list, desc_node) {

			if (child->lli.llp == llp) {

				/* Currently in progress */

				dwc->residue -= dwc_get_sent(dwc);

				spin_unlock_irqrestore(&dwc->lock, flags);

				return;

			}

			dwc->residue -= child->len;

		}



		/*

		 * No descriptors so far seem to be in progress, i.e.
@@ -1054,6 +1082,21 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, 
	return 0;

}



static inline u32 dwc_get_residue(struct dw_dma_chan *dwc)

{

	unsigned long flags;

	u32 residue;



	spin_lock_irqsave(&dwc->lock, flags);



	residue = dwc->residue;

	if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue)

		residue -= dwc_get_sent(dwc);



	spin_unlock_irqrestore(&dwc->lock, flags);

	return residue;

}



static enum dma_status

dwc_tx_status(struct dma_chan *chan,

	      dma_cookie_t cookie,
@@ -1070,7 +1113,7 @@ dwc_tx_status(struct dma_chan *chan, 
	}



	if (ret != DMA_SUCCESS)

		dma_set_residue(txstate, dwc_first_active(dwc)->len);

		dma_set_residue(txstate, dwc_get_residue(dwc));



	if (dwc->paused)

		return DMA_PAUSED;

drivers/dma/dw_dmac_regs.h

+1 −0
Original line number Diff line number Diff line
@@ -203,6 +203,7 @@ struct dw_dma_chan { 
	struct list_head	active_list;

	struct list_head	queue;

	struct list_head	free_list;

	u32			residue;

	struct dw_cyclic_desc	*cdesc;



	unsigned int		descs_allocated;