linux-kernel - [PATCH v4 1/2] dmaengine: dw-edma: Fix unmasking STOP and ABORT interrupts for HDMA

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Message-Id: <1724674261-3144-2-git-send-email-quic_msarkar@quicinc.com>
Date: Mon, 26 Aug 2024 17:41:00 +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>, stable@...r.kernel.org,
        Cai Huoqing <cai.huoqing@...ux.dev>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/2] dmaengine: dw-edma: Fix unmasking STOP and ABORT interrupts for HDMA

The current logic is enabling both STOP_INT_MASK and ABORT_INT_MASK
bit. This is apparently masking those particular interrupts rather than
unmasking the same. If the interrupts are masked, they would never get
triggered.

So fix the issue by unmasking the STOP and ABORT interrupts properly.

Fixes: e74c39573d35 ("dmaengine: dw-edma: Add support for native HDMA")
cc: stable@...r.kernel.org
Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/dma/dw-edma/dw-hdma-v0-core.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
index 10e8f07..2addaca 100644
--- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
+++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
@@ -247,10 +247,11 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
 	if (first) {
 		/* Enable engine */
 		SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0));
-		/* Interrupt enable&unmask - done, abort */
-		tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) |
-		      HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK |
-		      HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;
+		/* Interrupt unmask - stop, abort */
+		tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup);
+		tmp &= ~(HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK);
+		/* Interrupt enable - stop, abort */
+		tmp |= HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;
 		if (!(dw->chip->flags & DW_EDMA_CHIP_LOCAL))
 			tmp |= HDMA_V0_REMOTE_STOP_INT_EN | HDMA_V0_REMOTE_ABORT_INT_EN;
 		SET_CH_32(dw, chan->dir, chan->id, int_setup, tmp);
-- 
2.7.4