From 8552b5b4da3191bdf73132958f62bab75837175c Mon Sep 17 00:00:00 2001 From: "Steven J. Hill" Date: Tue, 26 Jul 2016 10:26:23 -0500 Subject: [PATCH] MIPS: Octeon: Put restrictions on DMA descriptors. Set the DMA mask such that all descriptors stay in the lower 4GB of memory. Signed-off-by: Steven J. Hill Acked-by: David Daney Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13830/ Signed-off-by: Ralf Baechle --- arch/mips/cavium-octeon/octeon-platform.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c index 7aeafedff94e..c9359fdae44b 100644 --- a/arch/mips/cavium-octeon/octeon-platform.c +++ b/arch/mips/cavium-octeon/octeon-platform.c @@ -311,7 +311,11 @@ static struct usb_ehci_pdata octeon_ehci_pdata = { #ifdef __BIG_ENDIAN .big_endian_mmio = 1, #endif - .dma_mask_64 = 1, + /* + * We can DMA from anywhere. But the descriptors must be in + * the lower 4GB. + */ + .dma_mask_64 = 0, .power_on = octeon_ehci_power_on, .power_off = octeon_ehci_power_off, }; -- 2.20.1