git.ipfire.org Git - thirdparty/openwrt.git/blob

   1 From ac56a225e0889e60e912ecd3a51333a5aee901fc Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Tue, 4 Mar 2025 15:28:53 +0000
   4 Subject: [PATCH] dtoverlays: ov9281: Add continuous clock option as an
   5  override
   6
   7 The previous change to make ov9281 always run in continuous clock
   8 mode causes problems on Pi3 for reasons that aren't fully
   9 understood. Pi4 is quite happy with it.
  10
  11 Change the default back to being non-continuous clock, and add
  12 an override to select continuous clock mode and its slightly
  13 greater max frame rate.
  14
  15 https://forums.raspberrypi.com/viewtopic.php?p=2300215
  16
  17 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  18 ---
  19  arch/arm/boot/dts/overlays/README             |  3 +++
  20  arch/arm/boot/dts/overlays/ov9281-overlay.dts | 16 +++++++++++++++-
  21  2 files changed, 18 insertions(+), 1 deletion(-)
  22
  23 --- a/arch/arm/boot/dts/overlays/README
  24 +++ b/arch/arm/boot/dts/overlays/README
  25 @@ -3570,6 +3570,9 @@ Params: rotation                Mounting
  26                                  Compute Module (CSI0, i2c_vc, and cam0_reg).
  27          arducam                 Slow down the regulator for slow Arducam
  28                                  modules.
  29 +        clk-continuous          Switch to continuous mode on the CSI clock lane,
  30 +                                which increases the maximum frame rate slightly.
  31 +                                Appears not to work on Pi3.
  32
  33
  34  Name:   papirus
  35 --- a/arch/arm/boot/dts/overlays/ov9281-overlay.dts
  36 +++ b/arch/arm/boot/dts/overlays/ov9281-overlay.dts
  37 @@ -64,6 +64,20 @@
  38                 };
  39         };
  40
  41 +       fragment@6 {
  42 +               target = <&csi_ep>;
  43 +               __overlay__ {
  44 +                       clock-noncontinuous;
  45 +               };
  46 +       };
  47 +
  48 +       fragment@7 {
  49 +               target = <&cam_endpoint>;
  50 +               __overlay__ {
  51 +                       clock-noncontinuous;
  52 +               };
  53 +       };
  54 +
  55         __overrides__ {
  56                 rotation = <&cam_node>,"rotation:0";
  57                 orientation = <&cam_node>,"orientation:0";
  58 @@ -75,7 +89,7 @@
  59                        <&cam_node>, "avdd-supply:0=",<&cam0_reg>,
  60                        <&reg_frag>, "target:0=",<&cam0_reg>;
  61                 arducam = <0>, "+5";
  62 -
  63 +               clk-continuous = <0>, "-6-7";
  64         };
  65  };
  66