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From: yibin.gong@nxp.com
To: shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com,
	vkoul@kernel.org, dan.j.williams@intel.com, thesven73@gmail.com
Cc: dmaengine@vger.kernel.org, linux-imx@nxp.com,
	linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de
Subject: [PATCH v1] dmaengine: imx-sdma: remove BD_INTR for channel0
Date: Fri, 14 Jun 2019 16:39:59 +0800
Message-ID: <20190614083959.37944-1-yibin.gong@nxp.com> (raw)

From: Robin Gong <yibin.gong@nxp.com>

It is possible for an irq triggered by channel0 to be received later
after clks are disabled once firmware loaded during sdma probe. If
that happens then clearing them by writing to SDMA_H_INTR won't work
and the system will hang processing infinite interrupts. Actually,
don't need interrupt triggered on channel0 since it's pollling
SDMA_H_STATSTOP to know channel0 done rather than interrupt in
current code, just clear BD_INTR to disable channel0 interrupt to
avoid the above case.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reported-by: Sven Van Asbroeck <thesven73@gmail.com>
---
 drivers/dma/imx-sdma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index deea9aa..b5a1ee2 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -742,7 +742,7 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
 	spin_lock_irqsave(&sdma->channel_0_lock, flags);
 
 	bd0->mode.command = C0_SETPM;
-	bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
+	bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD;
 	bd0->mode.count = size / 2;
 	bd0->buffer_addr = buf_phys;
 	bd0->ext_buffer_addr = address;
@@ -1064,7 +1064,7 @@ static int sdma_load_context(struct sdma_channel *sdmac)
 	context->gReg[7] = sdmac->watermark_level;
 
 	bd0->mode.command = C0_SETDM;
-	bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
+	bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD;
 	bd0->mode.count = sizeof(*context) / 4;
 	bd0->buffer_addr = sdma->context_phys;
 	bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;
-- 
2.7.4


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Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14  8:39 yibin.gong [this message]
2019-06-14 10:49 ` Fabio Estevam
2019-06-14 13:25   ` Sven Van Asbroeck
2019-06-14 18:09     ` Michael Olbrich
2019-06-17  2:14       ` Robin Gong
2019-06-17 10:15         ` m.olbrich
2019-06-18  6:08           ` Robin Gong
2019-06-18  6:19             ` m.olbrich
2019-06-17  2:02     ` Robin Gong
2019-06-17 13:27       ` Sven Van Asbroeck
2019-06-18  5:50         ` Robin Gong
2019-06-14 13:35 ` Sven Van Asbroeck
2019-06-17  1:42   ` Robin Gong

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