1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
From ac65af2b3277c319918d67e5714d1f88ed6e4ff9 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 181/222] 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";
};
|
