Re: [PATCH] of: reserved_mem: set dma_ops for devices using reserved mem

From: Marek Szyprowski
Date: Wed Dec 28 2016 - 06:09:07 EST

Hi Pankaj,

On 2016-12-21 06:44, Pankaj Dubey wrote:
From: Smitha T Murthy <smitha.t@xxxxxxxxxxx>

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@xxxxxxxxxxx>
Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>

Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

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,
list_add(&rd->list, &of_rmem_assigned_device_list);
+ /* 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 {

Best regards
Marek Szyprowski, PhD
Samsung R&D Institute Poland