| Message ID | 20200528222401.26941-9-Sergey.Semin@baikalelectronics.ru (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | dmaengine: dw: Take Baikal-T1 SoC DW DMAC peculiarities into account | expand |
On Fri, May 29, 2020 at 01:23:58AM +0300, Serge Semin wrote: > Since some DW DMA controllers (like one installed on Baikal-T1 SoC) may > have non-uniform DMA capabilities per device channels, let's add > the DW DMA specific device_caps callback to expose that specifics up to > the DMA consumer. It's a dummy function for now. We'll fill it in with > capabilities overrides in the next commits. This one I leave to Vinod to decide what to do. It is not harmful per se, but I consider better if it has a user already. Thus, no tag, sorry.
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index fb95920c429e..ceded21537e2 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -1049,6 +1049,11 @@ static void dwc_free_chan_resources(struct dma_chan *chan) dev_vdbg(chan2dev(chan), "%s: done\n", __func__); } +static void dwc_caps(struct dma_chan *chan, struct dma_slave_caps *caps) +{ + +} + int do_dma_probe(struct dw_dma_chip *chip) { struct dw_dma *dw = chip->dw; @@ -1214,6 +1219,7 @@ int do_dma_probe(struct dw_dma_chip *chip) dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy; dw->dma.device_prep_slave_sg = dwc_prep_slave_sg; + dw->dma.device_caps = dwc_caps; dw->dma.device_config = dwc_config; dw->dma.device_pause = dwc_pause; dw->dma.device_resume = dwc_resume;
Since some DW DMA controllers (like one installed on Baikal-T1 SoC) may have non-uniform DMA capabilities per device channels, let's add the DW DMA specific device_caps callback to expose that specifics up to the DMA consumer. It's a dummy function for now. We'll fill it in with capabilities overrides in the next commits. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v3: - This is a new patch created as a result of the discussion with Vinud and Andy in the framework of DW DMA burst and LLP capabilities. --- drivers/dma/dw/core.c | 6 ++++++ 1 file changed, 6 insertions(+)