Hi Peng,
On 2017-11-27 09:37, Peng Fan wrote:
Hi Marek,
On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
Hi
On 2017-11-26 14:13, Peng Fan wrote:
Invoke of_reserved_mem_device_init at dma_configure, then
there is no need to call of_reserved_mem_device_init in device
specific probe function.
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
This has been already tried long time ago, without success:
http://patches.linaro.org/patch/33558/
Thanks for the info. I should first search mail list before
sending out patches.
It doesn't mean that I'm against such idea. I just pointed that I've
already tried. That time, however there was no dma_configure() function
yet, which seems to be better place for of_rmem_device_init().
I would however always call of_dma_configure(), even when reserved mem
node is there. IIRC on ARM64 that function configures dma_ops, without
which no dma is possible at all.
Thanks,
Peng.
---
drivers/base/dma-mapping.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index e584eddef0a7..55dca06a7b55 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -12,6 +12,7 @@
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/of_device.h>
+#include <linux/of_reserved_mem.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
@@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
}
if (dma_dev->of_node) {
- ret = of_dma_configure(dev, dma_dev->of_node);
+ ret = of_reserved_mem_device_init(dev);
+ if (ret)
+ ret = of_dma_configure(dev, dma_dev->of_node);
} else if (has_acpi_companion(dma_dev)) {
attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
if (attr != DEV_DMA_NOT_SUPPORTED)
@@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
void dma_deconfigure(struct device *dev)
{
of_dma_deconfigure(dev);
+ of_reserved_mem_device_release(dev);
acpi_dma_deconfigure(dev);
}
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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