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From d9273547c2d4f0d79a3d22324dfc0e125754e6e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Sun, 13 Sep 2015 17:17:14 +0200
Subject: [PATCH 181/203] BCM270X_DT: mz61581: Set txbuflen to 32k
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Because of the spi dma mapping/engine overhead with spi-bcm2835,
txbuflen has to be increased from 4096 to 32768 to maximize
throughput (11MB/s at 128MHz).
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
arch/arm/boot/dts/overlays/README | 2 ++
arch/arm/boot/dts/overlays/mz61581-overlay.dts | 2 ++
2 files changed, 4 insertions(+)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -368,6 +368,8 @@ Params: speed Display
fps Delay between frame updates
+ txbuflen Transmit buffer length (default 32768)
+
debug Debug output level {0-7}
xohms Touchpanel sensitivity (X-plate resistance)
--- a/arch/arm/boot/dts/overlays/mz61581-overlay.dts
+++ b/arch/arm/boot/dts/overlays/mz61581-overlay.dts
@@ -57,6 +57,7 @@
bgr;
fps = <30>;
buswidth = <8>;
+ txbuflen = <32768>;
reset-gpios = <&gpio 15 0>;
dc-gpios = <&gpio 25 0>;
@@ -103,6 +104,7 @@
speed = <&mz61581>, "spi-max-frequency:0";
rotate = <&mz61581>, "rotate:0";
fps = <&mz61581>, "fps:0";
+ txbuflen = <&mz61581>, "txbuflen:0";
debug = <&mz61581>, "debug:0";
xohms = <&mz61581_ts>,"ti,x-plate-ohms;0";
};
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