On Tue, May 22, 2018 at 12:05 AM, Marek Vasut <marek.vasut@xxxxxxxxx> wrote: > From: Phil Edworthy <phil.edworthy@xxxxxxxxxxx> > > The PCIe DMA controller on RCar Gen2 and earlier is on 32bit bus, > so limit the DMA range to 32bit. > > Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx> > Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxx> > Cc: Arnd Bergmann <arnd@xxxxxxxx> > Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> > Cc: Phil Edworthy <phil.edworthy@xxxxxxxxxxx> > Cc: Simon Horman <horms+renesas@xxxxxxxxxxxx> > Cc: Wolfram Sang <wsa@xxxxxxxxxxxxx> > Cc: linux-renesas-soc@xxxxxxxxxxxxxxx > To: linux-pci@xxxxxxxxxxxxxxx > --- > NOTE: I'm aware of https://patchwork.kernel.org/patch/9495895/ , but the > discussion seems to have gone way off, so I'm sending this as a > RFC. Any feedback on how to do this limiting properly would be nice. Doing it in the driver is clearly not appropriate, we must do this in common code. If I remember correctly, it's specifically ARM64 that is broken here, it incorrectly allows setting a DMA mask to 64 bit when that is not available. Arnd
