linux-kernel - [PATCH RFC 5/5] ARM: bcm2711: use dma-direct

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Date:   Mon, 14 Oct 2019 20:31:07 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Eric Anholt <eric@...olt.net>, Stefan Wahren <wahrenst@....net>
Cc:     hch@...radead.org, mbrugger@...e.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC 5/5] ARM: bcm2711: use dma-direct

The Raspberry Pi 4 supports up to 4GB of memory yet most of its devices
are only able to address the fist GB. Enable dma-direct for that board
in order to benefit from swiotlb's bounce buffering mechanism.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 arch/arm/mach-bcm/Kconfig   | 1 +
 arch/arm/mach-bcm/bcm2711.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index e4e25f287ad7..fd7d725d596c 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -163,6 +163,7 @@ config ARCH_BCM2835
 	select ARM_ERRATA_411920 if ARCH_MULTI_V6
 	select ARM_GIC if ARCH_MULTI_V7
 	select ZONE_DMA if ARCH_MULTI_V7
+	select SWIOTLB if ARCH_MULTI_V7
 	select ARM_TIMER_SP804
 	select HAVE_ARM_ARCH_TIMER if ARCH_MULTI_V7
 	select TIMER_OF
diff --git a/arch/arm/mach-bcm/bcm2711.c b/arch/arm/mach-bcm/bcm2711.c
index dbe296798647..67d98cb0533f 100644
--- a/arch/arm/mach-bcm/bcm2711.c
+++ b/arch/arm/mach-bcm/bcm2711.c
@@ -19,6 +19,7 @@ DT_MACHINE_START(BCM2711, "BCM2711")
 #ifdef CONFIG_ZONE_DMA
 	.dma_zone_size	= SZ_1G,
 #endif
+	.dma_direct = true,
 	.dt_compat = bcm2711_compat,
 	.smp = smp_ops(bcm2836_smp_ops),
 MACHINE_END
-- 
2.23.0