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authorVinod Koul <vinod.koul@intel.com>2016-05-17 07:43:40 +0300
committerVinod Koul <vinod.koul@intel.com>2016-05-17 07:43:40 +0300
commita365c9685438713dbf88828282c4699f571b97de (patch)
tree99771a8be3519ff8fc1ff477e9f41cb53e2a1af7 /drivers/dma
parent511deae0261c839461948f2d4d1c13b8c8a59cd8 (diff)
parent20ea6be6bffd4da8cfe3aeea9e6a090f346a54da (diff)
downloadlinux-a365c9685438713dbf88828282c4699f571b97de.tar.xz
Merge branch 'topic/core' into for-linus
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c9
-rw-r--r--drivers/dma/of-dma.c12
2 files changed, 15 insertions, 6 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index ca1400d66957..8c9f45fd55fc 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -482,7 +482,8 @@ int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
device = chan->device;
/* check if the channel supports slave transactions */
- if (!test_bit(DMA_SLAVE, device->cap_mask.bits))
+ if (!(test_bit(DMA_SLAVE, device->cap_mask.bits) ||
+ test_bit(DMA_CYCLIC, device->cap_mask.bits)))
return -ENXIO;
/*
@@ -865,12 +866,12 @@ static bool device_has_all_tx_types(struct dma_device *device)
return false;
#endif
- #if defined(CONFIG_ASYNC_MEMCPY) || defined(CONFIG_ASYNC_MEMCPY_MODULE)
+ #if IS_ENABLED(CONFIG_ASYNC_MEMCPY)
if (!dma_has_cap(DMA_MEMCPY, device->cap_mask))
return false;
#endif
- #if defined(CONFIG_ASYNC_XOR) || defined(CONFIG_ASYNC_XOR_MODULE)
+ #if IS_ENABLED(CONFIG_ASYNC_XOR)
if (!dma_has_cap(DMA_XOR, device->cap_mask))
return false;
@@ -880,7 +881,7 @@ static bool device_has_all_tx_types(struct dma_device *device)
#endif
#endif
- #if defined(CONFIG_ASYNC_PQ) || defined(CONFIG_ASYNC_PQ_MODULE)
+ #if IS_ENABLED(CONFIG_ASYNC_PQ)
if (!dma_has_cap(DMA_PQ, device->cap_mask))
return false;
diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 1e1f2986eba8..faae0bfe1109 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -240,8 +240,9 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
struct of_phandle_args dma_spec;
struct of_dma *ofdma;
struct dma_chan *chan;
- int count, i;
+ int count, i, start;
int ret_no_channel = -ENODEV;
+ static atomic_t last_index;
if (!np || !name) {
pr_err("%s: not enough information provided\n", __func__);
@@ -259,8 +260,15 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
return ERR_PTR(-ENODEV);
}
+ /*
+ * approximate an average distribution across multiple
+ * entries with the same name
+ */
+ start = atomic_inc_return(&last_index);
for (i = 0; i < count; i++) {
- if (of_dma_match_channel(np, name, i, &dma_spec))
+ if (of_dma_match_channel(np, name,
+ (i + start) % count,
+ &dma_spec))
continue;
mutex_lock(&of_dma_lock);