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Tue, 15 Sep 2026 01:18:31 -0700 (PDT) Received: from center.jhjvjihww5qejoy14qwv1cc4td.frax.internal.cloudapp.net ([131.189.143.225]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-486eb2ecfc3sm31341974f8f.4.2026.09.15.01.18.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2026 01:18:30 -0700 (PDT) From: Orgad Shaneh To: tsbogend@alpha.franken.de Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] MIPS: Octeon: size the swiotlb for a modular OHCI platform driver Date: Tue, 15 Sep 2026 08:18:24 +0000 Message-ID: <20260915081828.25800-1-orgads@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit plat_swiotlb_setup() raises the swiotlb to 64 MB on OCTEON II with memory above 4 GB, because that OHCI can only DMA to 32 bits. The test is "#ifdef CONFIG_USB_OHCI_HCD_PLATFORM", which is false when the driver is a module - the usual way to build it - so the bump is silently skipped. What is left depends on the rest of the function: with PCI enabled the "memory past the BAR1 hole" branch happens to ask for the same 64 MB, but with CONFIG_PCI off - which is normal on these SoCs when no PCI devices are wired - swiotlbsize stays at the PAGE_SIZE it was initialised to. A full- or low-speed device on an OCTEON II board with more than 4 GB of RAM then has no bounce buffer to speak of. Use IS_ENABLED() so a modular OHCI gets the same sizing as a built-in one. Seen on a CN6635 board with 8 GB of RAM and CONFIG_USB_OHCI_HCD_PLATFORM=m. Fixes: a8667d706dfa ("MIPS: OCTEON: dma-octeon: fix OHCI USB config check") Assisted-by: Claude:claude-opus-5 Signed-off-by: Orgad Shaneh --- diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c --- a/arch/mips/cavium-octeon/dma-octeon.c +++ b/arch/mips/cavium-octeon/dma-octeon.c @@ -228,7 +228,7 @@ void __init plat_swiotlb_setup(void) swiotlbsize = 64 * (1<<20); } #endif -#ifdef CONFIG_USB_OHCI_HCD_PLATFORM +#if IS_ENABLED(CONFIG_USB_OHCI_HCD_PLATFORM) /* OCTEON II ohci is only 32-bit. */ if (OCTEON_IS_OCTEON2() && max_addr >= 0x100000000ul) swiotlbsize = 64 * (1<<20); -- 2.47.0