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From ac65af2b3277c319918d67e5714d1f88ed6e4ff9 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
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Date: Sun, 13 Sep 2015 17:17:14 +0200
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Subject: [PATCH 181/222] BCM270X_DT: mz61581: Set txbuflen to 32k
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Because of the spi dma mapping/engine overhead with spi-bcm2835,
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txbuflen has to be increased from 4096 to 32768 to maximize
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throughput (11MB/s at 128MHz).
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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---
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arch/arm/boot/dts/overlays/README | 2 ++
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arch/arm/boot/dts/overlays/mz61581-overlay.dts | 2 ++
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2 files changed, 4 insertions(+)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -368,6 +368,8 @@ Params: speed Display
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fps Delay between frame updates
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+ txbuflen Transmit buffer length (default 32768)
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+
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debug Debug output level {0-7}
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xohms Touchpanel sensitivity (X-plate resistance)
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--- a/arch/arm/boot/dts/overlays/mz61581-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/mz61581-overlay.dts
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@@ -57,6 +57,7 @@
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bgr;
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fps = <30>;
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buswidth = <8>;
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+ txbuflen = <32768>;
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reset-gpios = <&gpio 15 0>;
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dc-gpios = <&gpio 25 0>;
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@@ -103,6 +104,7 @@
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speed = <&mz61581>, "spi-max-frequency:0";
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rotate = <&mz61581>, "rotate:0";
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fps = <&mz61581>, "fps:0";
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+ txbuflen = <&mz61581>, "txbuflen:0";
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debug = <&mz61581>, "debug:0";
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xohms = <&mz61581_ts>,"ti,x-plate-ohms;0";
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};
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