On Tue, May 22, 2018 at 12:05 AM, Marek Vasut <[email protected]> wrote:
> From: Phil Edworthy <[email protected]>
>
> 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 <[email protected]>
> Signed-off-by: Marek Vasut <[email protected]>
> Cc: Arnd Bergmann <[email protected]>
> Cc: Geert Uytterhoeven <[email protected]>
> Cc: Phil Edworthy <[email protected]>
> Cc: Simon Horman <[email protected]>
> Cc: Wolfram Sang <[email protected]>
> Cc: [email protected]
> To: [email protected]
> ---
> 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
