| Message ID | 20200709224550.15539-9-Sergey.Semin@baikalelectronics.ru (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | dmaengine: dw: Take Baikal-T1 SoC DW DMAC peculiarities into account | expand |
On Fri, Jul 10, 2020 at 01:45:47AM +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. Just a reminder (mainly to Vinod) of my view to this. Unneeded churn, should be folded to patch 9. > 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(+) > > 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; > -- > 2.26.2 >
On Fri, Jul 10, 2020 at 11:51:23AM +0300, Andy Shevchenko wrote: > On Fri, Jul 10, 2020 at 01:45:47AM +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. > > Just a reminder (mainly to Vinod) of my view to this. > Unneeded churn, should be folded to patch 9. Sorry, s/9/10/ (also the sign that they should be in one, rather than spread over the series).
On Fri, Jul 10, 2020 at 11:51:23AM +0300, Andy Shevchenko wrote: > On Fri, Jul 10, 2020 at 01:45:47AM +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. > > Just a reminder (mainly to Vinod) of my view to this. > Unneeded churn, should be folded to patch 9. Just to remind (mainly to Vinod). That's Andy's bikeshedding. This isn't a churn, since it's totally normal to design the patchset in this way: introduce a callback, then fill it in with functionality. -Sergey > > > 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(+) > > > > 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; > > -- > > 2.26.2 > > > > -- > With Best Regards, > Andy Shevchenko > >
On 10-07-20, 12:45, Serge Semin wrote: > On Fri, Jul 10, 2020 at 11:51:23AM +0300, Andy Shevchenko wrote: > > On Fri, Jul 10, 2020 at 01:45:47AM +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. > > > > > Just a reminder (mainly to Vinod) of my view to this. > > Unneeded churn, should be folded to patch 9. > > Just to remind (mainly to Vinod). That's Andy's bikeshedding. > This isn't a churn, since it's totally normal to design the patchset in this way: > introduce a callback, then fill it in with functionality. Looking at both patches, they do one thing, so please fold them in..
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(+)