linux-kernel - [PATCH v1 2/2] dmaengine: dw-edma: Add change to remove watermark interrupt enablement

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Message-Id: <1720187733-5380-3-git-send-email-quic_msarkar@quicinc.com>
Date: Fri,  5 Jul 2024 19:25:33 +0530
From: Mrinmay Sarkar <quic_msarkar@...cinc.com>
To: manivannan.sadhasivam@...aro.org, fancer.lancer@...il.com,
        vkoul@...nel.org
Cc: quic_shazhuss@...cinc.com, quic_nitegupt@...cinc.com,
        quic_ramkri@...cinc.com, quic_nayiluri@...cinc.com,
        quic_krichai@...cinc.com, quic_vbadigan@...cinc.com,
        Mrinmay Sarkar <quic_msarkar@...cinc.com>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/2] dmaengine: dw-edma: Add change to remove watermark interrupt enablement

DW_HDMA_V0_LIE and DW_HDMA_V0_RIE are initialized as BIT(3) and BIT(4)
respectively in dw_hdma_control enum. But as per HDMA register these
bits are corresponds to LWIE and RWIE bit i.e local watermark interrupt
enable and remote watermarek interrupt enable. In linked list mode LWIE
and RWIE bits only enable the local and remote watermark interrupt.

As we are not handling watermark interruprt so removing watermark
interrupt enablement logic to avoid unnecessary watermark interrupt
event.

Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
---
 drivers/dma/dw-edma/dw-hdma-v0-core.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
index 88bd652f..aaf2e27 100644
--- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
+++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
@@ -197,23 +197,13 @@ static void dw_hdma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
 	struct dw_edma_burst *child;
 	struct dw_edma_chan *chan = chunk->chan;
 	u32 control = 0, i = 0;
-	int j;
 
 	if (chunk->cb)
 		control = DW_HDMA_V0_CB;
 
-	j = chunk->bursts_alloc;
-	list_for_each_entry(child, &chunk->burst->list, list) {
-		j--;
-		if (!j) {
-			control |= DW_HDMA_V0_LIE;
-			if (!(chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL))
-				control |= DW_HDMA_V0_RIE;
-		}
-
+	list_for_each_entry(child, &chunk->burst->list, list)
 		dw_hdma_v0_write_ll_data(chunk, i++, control, child->sz,
 					 child->sar, child->dar);
-	}
 
 	control = DW_HDMA_V0_LLP | DW_HDMA_V0_TCB;
 	if (!chunk->cb)
-- 
2.7.4