openwrtv3/target/linux/brcm2708/patches-4.1/0181-BCM270X_DT-mz61581-Set-txbuflen-to-32k.patch
John Crispin bf28fb50bf brcm2708: update 4.1 patches
As usual, this patches were taken (and rebased) from
https://github.com/raspberrypi/linux/commits/rpi-4.1.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 47258
2015-10-26 09:01:05 +00:00

47 lines
1.6 KiB
Diff

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";
};