From: Imre Kaloz <kaloz@kernel.org>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
linux-mips@vger.kernel.org
Cc: Kees Cook <kees@kernel.org>, linux-kernel@vger.kernel.org
Subject: [PATCH] MIPS: PCI: xtalk-bridge: disable byte swapping for SGI RAD1
Date: Mon, 26 Oct 2026 14:17:52 +0100 [thread overview]
Message-ID: <20261026131752.7519-1-kaloz@kernel.org> (raw)
The RAD1 audio DMA engine moves big-endian sample words. With the
Bridge byte swap left on for its slot, captured samples arrive
byte-reversed and playback feeds the DACs scrambled words.
Signed-off-by: Imre Kaloz <kaloz@kernel.org>
---
arch/mips/pci/pci-xtalk-bridge.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/mips/pci/pci-xtalk-bridge.c b/arch/mips/pci/pci-xtalk-bridge.c
index cf115abb54e0..1072e70bcd42 100644
--- a/arch/mips/pci/pci-xtalk-bridge.c
+++ b/arch/mips/pci/pci-xtalk-bridge.c
@@ -105,6 +105,9 @@ static void bridge_disable_swapping(struct pci_dev *dev)
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
bridge_disable_swapping);
+/* The RAD1 audio DMA engine transfers its sample words big-endian. */
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, 0x0005, bridge_disable_swapping);
+
/*
* The Bridge ASIC supports both type 0 and type 1 access. Type 1 is
--
2.47.3
reply other threads:[~2026-10-26 13:19 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20261026131752.7519-1-kaloz@kernel.org \
--to=kaloz@kernel.org \
--cc=kees@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=tsbogend@alpha.franken.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®