> -----Original Message----- > From: Robin Murphy [mailto:robin.murphy@xxxxxxx] > Sent: Tuesday, July 3, 2018 9:44 PM > To: Nipun Gupta <nipun.gupta@xxxxxxx>; will.deacon@xxxxxxx; > robh+dt@xxxxxxxxxx; robh@xxxxxxxxxx; mark.rutland@xxxxxxx; > catalin.marinas@xxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; Laurentiu Tudor > <laurentiu.tudor@xxxxxxx>; bhelgaas@xxxxxxxxxx > Cc: hch@xxxxxx; joro@xxxxxxxxxx; m.szyprowski@xxxxxxxxxxx; > shawnguo@xxxxxxxxxx; frowand.list@xxxxxxxxx; iommu@lists.linux- > foundation.org; linux-kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx; linux- > pci@xxxxxxxxxxxxxxx; Bharat Bhushan <bharat.bhushan@xxxxxxx>; > stuyoder@xxxxxxxxx; Leo Li <leoyang.li@xxxxxxx> > Subject: Re: [PATCH 5/7 v5] bus: fsl-mc: support dma configure for devices > on fsl-mc bus > > On 20/05/18 14:49, Nipun Gupta wrote: > > This patch adds support of dma configuration for devices on fsl-mc > > bus using 'dma_configure' callback for busses. Also, directly calling > > arch_setup_dma_ops is removed from the fsl-mc bus. > > Looks like this is the final arch_setup_dma_ops offender, yay! > > > Signed-off-by: Nipun Gupta <nipun.gupta@xxxxxxx> > > Reviewed-by: Laurentiu Tudor <laurentiu.tudor@xxxxxxx> > > --- > > drivers/bus/fsl-mc/fsl-mc-bus.c | 15 +++++++++++---- > > 1 file changed, 11 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc- > bus.c > > index 5d8266c..fa43c7d 100644 > > --- a/drivers/bus/fsl-mc/fsl-mc-bus.c > > +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c > > @@ -127,6 +127,16 @@ static int fsl_mc_bus_uevent(struct device *dev, > struct kobj_uevent_env *env) > > return 0; > > } > > > > +static int fsl_mc_dma_configure(struct device *dev) > > +{ > > + struct device *dma_dev = dev; > > + > > + while (dev_is_fsl_mc(dma_dev)) > > + dma_dev = dma_dev->parent; > > + > > + return of_dma_configure(dev, dma_dev->of_node, 0); > > +} > > + > > static ssize_t modalias_show(struct device *dev, struct device_attribute > *attr, > > char *buf) > > { > > @@ -148,6 +158,7 @@ struct bus_type fsl_mc_bus_type = { > > .name = "fsl-mc", > > .match = fsl_mc_bus_match, > > .uevent = fsl_mc_bus_uevent, > > + .dma_configure = fsl_mc_dma_configure, > > .dev_groups = fsl_mc_dev_groups, > > }; > > EXPORT_SYMBOL_GPL(fsl_mc_bus_type); > > @@ -633,10 +644,6 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc > *obj_desc, > > goto error_cleanup_dev; > > } > > > > - /* Objects are coherent, unless 'no shareability' flag set. */ > > - if (!(obj_desc->flags & > FSL_MC_OBJ_FLAG_NO_MEM_SHAREABILITY)) > > Although it seems we do end up without any handling of this > "non-coherent object behind coherent MC" case, and I'm not sure how > easily that could be accommodated by generic code... :/ How important is > the quirk? We have all the devices as coherent in our SoC's now :) So this is fine. We have internally discussed it. Regards, Nipun > > Robin. > > > - arch_setup_dma_ops(&mc_dev->dev, 0, 0, NULL, true); > > - > > /* > > * The device-specific probe callback will get invoked by device_add() > > */ > >
