From: Pankaj Dubey <pankaj.dubey@samsung.com>
To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-samsung-soc@vger.kernel.org
Cc: m.szyprowski@samsung.com, robh+dt@kernel.org, frowand.list@gmail.com,
        hans.verkuil@cisco.com, krzk@kernel.org, kgene@kernel.org,
        Smitha T Murthy <smitha.t@samsung.com>,
        Pankaj Dubey <pankaj.dubey@samsung.com>
Subject: [PATCH] of: reserved_mem: set dma_ops for devices using reserved mem
Date: Wed, 21 Dec 2016 11:14:31 +0530
Message-id: <1482299071-22637-1-git-send-email-pankaj.dubey@samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1105
Lines: 30

From: Smitha T Murthy <smitha.t@samsung.com>

For some IPs, there may be virtual child devices created and for them its
necessary to set the dma_ops if it's using reserved memory else it will call
the dummy dma_ops during buffer operations for the child devices which will
lead to memory mapping failure.

Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
---
 drivers/of/of_reserved_mem.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 366d8c3..d507c35 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -354,6 +354,10 @@ int of_reserved_mem_device_init_by_idx(struct device *dev,
 		mutex_lock(&of_rmem_assigned_device_mutex);
 		list_add(&rd->list, &of_rmem_assigned_device_list);
 		mutex_unlock(&of_rmem_assigned_device_mutex);
+		/* ensure that dma_ops is set for virtual devices
+		 * using reserved memory
+		 */
+		of_dma_configure(dev, np);
 
 		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
 	} else {
-- 
2.7.4