Commit d3ae8835 authored by Mark Brown's avatar Mark Brown

Merge branch 'topic/defer_probe' of git://git.infradead.org/users/vkoul/slave-dma into asoc-dma

The following branch/patch is a dependency for my "ASoC: dmaengine:
support deferred probe for DMA channels". If you could pull the branch
below into your topic/dma, then merge my ASoC patch, that would be
great. I would then like to merge your topic/dma into the Tegra tree as
a baseline for the Tegra conversion to the standard DMA DT bindings.

Vinod has confirmed this his topic/defer_probe branch is stable, and
won't be rebased:

https://lkml.org/lkml/2013/12/10/463
parents 194c7dea 0ad7c000
......@@ -540,6 +540,8 @@ EXPORT_SYMBOL_GPL(dma_get_slave_channel);
* @mask: capabilities that the channel must satisfy
* @fn: optional callback to disposition available channels
* @fn_param: opaque parameter to pass to dma_filter_fn
*
* Returns pointer to appropriate DMA channel on success or NULL.
*/
struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
dma_filter_fn fn, void *fn_param)
......@@ -591,18 +593,43 @@ EXPORT_SYMBOL_GPL(__dma_request_channel);
* dma_request_slave_channel - try to allocate an exclusive slave channel
* @dev: pointer to client device structure
* @name: slave channel name
*
* Returns pointer to appropriate DMA channel on success or an error pointer.
*/
struct dma_chan *dma_request_slave_channel(struct device *dev, const char *name)
struct dma_chan *dma_request_slave_channel_reason(struct device *dev,
const char *name)
{
struct dma_chan *chan;
/* If device-tree is present get slave info from here */
if (dev->of_node)
return of_dma_request_slave_channel(dev->of_node, name);
/* If device was enumerated by ACPI get slave info from here */
if (ACPI_HANDLE(dev))
return acpi_dma_request_slave_chan_by_name(dev, name);
if (ACPI_HANDLE(dev)) {
chan = acpi_dma_request_slave_chan_by_name(dev, name);
if (chan)
return chan;
}
return NULL;
return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL_GPL(dma_request_slave_channel_reason);
/**
* dma_request_slave_channel - try to allocate an exclusive slave channel
* @dev: pointer to client device structure
* @name: slave channel name
*
* Returns pointer to appropriate DMA channel on success or NULL.
*/
struct dma_chan *dma_request_slave_channel(struct device *dev,
const char *name)
{
struct dma_chan *ch = dma_request_slave_channel_reason(dev, name);
if (IS_ERR(ch))
return NULL;
return ch;
}
EXPORT_SYMBOL_GPL(dma_request_slave_channel);
......
......@@ -143,7 +143,7 @@ static int of_dma_match_channel(struct device_node *np, const char *name,
* @np: device node to get DMA request from
* @name: name of desired channel
*
* Returns pointer to appropriate dma channel on success or NULL on error.
* Returns pointer to appropriate DMA channel on success or an error pointer.
*/
struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
const char *name)
......@@ -152,17 +152,18 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
struct of_dma *ofdma;
struct dma_chan *chan;
int count, i;
int ret_no_channel = -ENODEV;
if (!np || !name) {
pr_err("%s: not enough information provided\n", __func__);
return NULL;
return ERR_PTR(-ENODEV);
}
count = of_property_count_strings(np, "dma-names");
if (count < 0) {
pr_err("%s: dma-names property of node '%s' missing or empty\n",
__func__, np->full_name);
return NULL;
return ERR_PTR(-ENODEV);
}
for (i = 0; i < count; i++) {
......@@ -172,10 +173,12 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
mutex_lock(&of_dma_lock);
ofdma = of_dma_find_controller(&dma_spec);
if (ofdma)
if (ofdma) {
chan = ofdma->of_dma_xlate(&dma_spec, ofdma);
else
} else {
ret_no_channel = -EPROBE_DEFER;
chan = NULL;
}
mutex_unlock(&of_dma_lock);
......@@ -185,7 +188,7 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
return chan;
}
return NULL;
return ERR_PTR(ret_no_channel);
}
/**
......
......@@ -22,6 +22,7 @@
#define LINUX_DMAENGINE_H
#include <linux/device.h>
#include <linux/err.h>
#include <linux/uio.h>
#include <linux/bug.h>
#include <linux/scatterlist.h>
......@@ -1040,6 +1041,8 @@ enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
void dma_issue_pending_all(void);
struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
dma_filter_fn fn, void *fn_param);
struct dma_chan *dma_request_slave_channel_reason(struct device *dev,
const char *name);
struct dma_chan *dma_request_slave_channel(struct device *dev, const char *name);
void dma_release_channel(struct dma_chan *chan);
#else
......@@ -1063,6 +1066,11 @@ static inline struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
{
return NULL;
}
static inline struct dma_chan *dma_request_slave_channel_reason(
struct device *dev, const char *name)
{
return ERR_PTR(-ENODEV);
}
static inline struct dma_chan *dma_request_slave_channel(struct device *dev,
const char *name)
{
......
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