target/linux/brcm2708/patches-4.1/0181-BCM270X_DT-mz61581-Set-txbuflen-to-32k.patch

   1 From ac65af2b3277c319918d67e5714d1f88ed6e4ff9 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
   3 Date: Sun, 13 Sep 2015 17:17:14 +0200
   4 Subject: [PATCH 181/222] BCM270X_DT: mz61581: Set txbuflen to 32k
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Because of the spi dma mapping/engine overhead with spi-bcm2835,
  10 txbuflen has to be increased from 4096 to 32768 to maximize
  11 throughput (11MB/s at 128MHz).
  12
  13 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  14 ---
  15  arch/arm/boot/dts/overlays/README              | 2 ++
  16  arch/arm/boot/dts/overlays/mz61581-overlay.dts | 2 ++
  17  2 files changed, 4 insertions(+)
  18
  19 --- a/arch/arm/boot/dts/overlays/README
  20 +++ b/arch/arm/boot/dts/overlays/README
  21 @@ -368,6 +368,8 @@ Params: speed                    Display
  22
  23          fps                      Delay between frame updates
  24
  25 +        txbuflen                 Transmit buffer length (default 32768)
  26 +
  27          debug                    Debug output level {0-7}
  28
  29          xohms                    Touchpanel sensitivity (X-plate resistance)
  30 --- a/arch/arm/boot/dts/overlays/mz61581-overlay.dts
  31 +++ b/arch/arm/boot/dts/overlays/mz61581-overlay.dts
  32 @@ -57,6 +57,7 @@
  33                                 bgr;
  34                                 fps = <30>;
  35                                 buswidth = <8>;
  36 +                               txbuflen = <32768>;
  37
  38                                 reset-gpios = <&gpio 15 0>;
  39                                 dc-gpios = <&gpio 25 0>;
  40 @@ -103,6 +104,7 @@
  41                 speed =   <&mz61581>, "spi-max-frequency:0";
  42                 rotate =  <&mz61581>, "rotate:0";
  43                 fps =     <&mz61581>, "fps:0";
  44 +               txbuflen = <&mz61581>, "txbuflen:0";
  45                 debug =   <&mz61581>, "debug:0";
  46                 xohms =   <&mz61581_ts>,"ti,x-plate-ohms;0";
  47         };