From: Christoph Hellwig <hch@infradead.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Sven Peter <sven@svenpeter.dev>,
USB list <linux-usb@vger.kernel.org>,
Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3] usb: dwc3: support 64 bit DMA in platform driver
Date: Mon, 7 Jun 2021 11:04:56 +0100 [thread overview]
Message-ID: <YL3vSPK5DXTNvgdx@infradead.org> (raw)
In-Reply-To: <CAK8P3a0vbyq-90pUQ6-0Ed=DadR3Pnf0juupLQ70psQSuu_1nw@mail.gmail.com>
On Mon, Jun 07, 2021 at 09:25:43AM +0200, Arnd Bergmann wrote:
> This will now fail on machines with dwc3 connected to a 32-bit bus (or a
> bus that is accidentally not annotated as supporting 64-bit) when there is
> some memory that is not addressable through that bus.
No, it won't. dma_set_mask_and_coherent with a 64-bit mask will never
fail if dev->dma_mask is non-NULL.
next prev parent reply other threads:[~2021-06-07 10:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 6:17 [PATCH v3] usb: dwc3: support 64 bit DMA in platform driver Sven Peter
2021-06-07 7:25 ` Arnd Bergmann
2021-06-07 8:01 ` Sven Peter
2021-06-07 8:22 ` Arnd Bergmann
2021-06-07 9:06 ` Sven Peter
2021-06-07 9:17 ` Arnd Bergmann
2021-06-07 10:04 ` Christoph Hellwig [this message]
2021-06-07 10:05 ` Christoph Hellwig
2021-06-10 9:24 ` Felipe Balbi
2021-06-10 15:24 ` Sven Peter
2021-06-11 13:17 ` Felipe Balbi
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