linux-kernel - [PATCH 4.9 044/119] dmaengine: ep93xx: Always start from BASE0

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Date:   Mon, 12 Jun 2017 17:25:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Vinod Koul <vinod.koul@...el.com>
Subject: [PATCH 4.9 044/119] dmaengine: ep93xx: Always start from BASE0

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Sverdlin <alexander.sverdlin@...il.com>

commit 0037ae47812b1f431cc602100d1d51f37d77b61e upstream.

The current buffer is being reset to zero on device_free_chan_resources()
but not on device_terminate_all(). It could happen that HW is restarted and
expects BASE0 to be used, but the driver is not synchronized and will start
from BASE1. One solution is to reset the buffer explicitly in
m2p_hw_setup().

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/ep93xx_dma.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/dma/ep93xx_dma.c
+++ b/drivers/dma/ep93xx_dma.c
@@ -323,6 +323,8 @@ static int m2p_hw_setup(struct ep93xx_dm
 		| M2P_CONTROL_ENABLE;
 	m2p_set_control(edmac, control);
 
+	edmac->buffer = 0;
+
 	return 0;
 }