| Message ID | 201301232228.46716.arnd@arndb.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Jan 23, 2013 at 10:28:46PM +0000, Arnd Bergmann wrote: > On Tuesday 15 January 2013, Matt Porter wrote: > > Adds a dma_request_slave_channel_compat() wrapper which accepts > > both the arguments from dma_request_channel() and > > dma_request_slave_channel(). Based on whether the driver is > > instantiated via DT, the appropriate channel request call will be > > made. > > > > This allows for a much cleaner migration of drivers to the > > dmaengine DT API as platforms continue to be mixed between those > > that boot using DT and those that do not. > > I noticed today some drivers in linux-next that rely on this patch, > but the patch itself still missing from -next. > > > --- a/include/linux/dmaengine.h > > +++ b/include/linux/dmaengine.h > > @@ -1047,6 +1047,16 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx); > > struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type); > > struct dma_chan *net_dma_find_channel(void); > > #define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y) > > +static inline struct dma_chan > > +*dma_request_slave_channel_compat(dma_cap_mask_t mask, dma_filter_fn fn, > > + void *fn_param, struct device *dev, > > + char *name) > > +{ > > + if (dev->of_node) > > + return dma_request_slave_channel(dev, name); > > + else > > + return dma_request_channel(mask, fn, fn_param); > > +} > > Hmm, dma_request_channel is actually a macro that passes mask by reference, > presumably because it can get modified by the filter function. Also, there > may be cases where we do have an of_node but don't use the dma binding > yet, or where dma_request_slave_channel doesn't actually use DT information > but rather one of the other methods that Vinod was talking about adding. > > I think what it should look like instead is the below. Yes, looks correct now, thanks. I've incorporated it into v6. -Matt > > Arnd > > diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h > index bfcdecb..b6ffd7d 100644 > --- a/include/linux/dmaengine.h > +++ b/include/linux/dmaengine.h > @@ -993,6 +993,19 @@ static inline void dma_release_channel(struct dma_chan *chan) > } > #endif > > +static inline struct dma_chan *__dma_request_slave_channel_compat(dma_cap_mask_t *mask, > + dma_filter_fn fn, void *fn_param, struct device *dev, > + char *name) > +{ > + struct dma_chan *chan; > + > + chan = dma_request_slave_channel(dev, name); > + if (chan) > + return chan; > + > + return __dma_request_channel(mask, fn, fn_param); > +} > + > /* --- DMA device --- */ > > int dma_async_device_register(struct dma_device *device); > @@ -1001,6 +1014,8 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx); > struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type); > struct dma_chan *net_dma_find_channel(void); > #define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y) > +#define dma_request_slave_channel_compat(mask, x, y, dev, name) \ > + __dma_request_slave_channel_compat(&(mask), x, y, dev, name) > > /* --- Helper iov-locking functions --- */ > > _______________________________________________ > Davinci-linux-open-source mailing list > Davinci-linux-open-source@linux.davincidsp.com > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index bfcdecb..b6ffd7d 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -993,6 +993,19 @@ static inline void dma_release_channel(struct dma_chan *chan) } #endif +static inline struct dma_chan *__dma_request_slave_channel_compat(dma_cap_mask_t *mask, + dma_filter_fn fn, void *fn_param, struct device *dev, + char *name) +{ + struct dma_chan *chan; + + chan = dma_request_slave_channel(dev, name); + if (chan) + return chan; + + return __dma_request_channel(mask, fn, fn_param); +} + /* --- DMA device --- */ int dma_async_device_register(struct dma_device *device); @@ -1001,6 +1014,8 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx); struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type); struct dma_chan *net_dma_find_channel(void); #define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y) +#define dma_request_slave_channel_compat(mask, x, y, dev, name) \ + __dma_request_slave_channel_compat(&(mask), x, y, dev, name) /* --- Helper iov-locking functions --- */