linux-kernel - [PATCH] nubus: Set default dma mask for nubus

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Message-Id: <142066981b41910f4e645590a8b1734a1ea72fb8.1529926655.git.fthain@telegraphics.com.au>
Date:   Mon, 25 Jun 2018 21:46:11 +1000
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Christoph Hellwig <hch@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: [PATCH] nubus: Set default dma mask for nubus_board devices

A 32-bit mask is used by default because a NuBus slot has 32
address/data lines and a NuBus board is free to use all of them.

Cc: Christoph Hellwig <hch@....de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 drivers/nubus/bus.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/nubus/bus.c b/drivers/nubus/bus.c
index a59b6c4bb5b8..ad3d17c42e23 100644
--- a/drivers/nubus/bus.c
+++ b/drivers/nubus/bus.c
@@ -5,6 +5,7 @@
 // Copyright (C) 2017 Finn Thain
 
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
 #include <linux/list.h>
 #include <linux/nubus.h>
 #include <linux/seq_file.h>
@@ -93,6 +94,8 @@ int nubus_device_register(struct nubus_board *board)
 	board->dev.release = nubus_device_release;
 	board->dev.bus = &nubus_bus_type;
 	dev_set_name(&board->dev, "slot.%X", board->slot);
+	board->dev.dma_mask = &board->dev.coherent_dma_mask;
+	dma_set_mask(&board->dev, DMA_BIT_MASK(32));
 	return device_register(&board->dev);
 }
 
-- 
2.16.4