cd2114e19c
As usual these patches were extracted from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 48966
28 lines
1,008 B
Diff
28 lines
1,008 B
Diff
From 6dcfc3daab7c1c459b36261163b4e1dc15a6e965 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Wed, 3 Feb 2016 16:12:54 +0000
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Subject: [PATCH 141/170] BCM270X_DT: Disable DMA for bcm2835-sdhost on Pi2
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This is an interim patch to verify that problems seen with
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some cards can be worked around at the expense of an increased
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CPU load by forcing PIO mode.
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Although this could have used the brcm,force-pio attribute, that
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is a boolean (true if present, false if absent) and attributes
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can't be deleted by overlays. Instead, make brcm,pio-limit
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unfeasibly high instead to allow DMA to be re-enabled using the
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pio_limit parameter of the sdhost or sdtweak overlays.
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---
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arch/arm/boot/dts/bcm2709-rpi-2-b.dts | 1 +
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1 file changed, 1 insertion(+)
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--- a/arch/arm/boot/dts/bcm2709-rpi-2-b.dts
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+++ b/arch/arm/boot/dts/bcm2709-rpi-2-b.dts
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@@ -43,6 +43,7 @@
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pinctrl-names = "default";
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pinctrl-0 = <&sdhost_pins>;
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bus-width = <4>;
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+ brcm,pio-limit = <0x7fffffff>;
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status = "okay";
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};
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