From 17904cb5a47f482baf26acc364f37d6d579ceb17 Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Tue, 4 Mar 2025 15:28:53 +0000 Subject: [PATCH] dtoverlays: ov9281: Add continuous clock option as an override The previous change to make ov9281 always run in continuous clock mode causes problems on Pi3 for reasons that aren't fully understood. Pi4 is quite happy with it. Change the default back to being non-continuous clock, and add an override to select continuous clock mode and its slightly greater max frame rate. https://forums.raspberrypi.com/viewtopic.php?p=2300215 Signed-off-by: Dave Stevenson --- arch/arm/boot/dts/overlays/README | 3 +++ arch/arm/boot/dts/overlays/ov9281-overlay.dts | 15 +++++++++++++++ 2 files changed, 18 insertions(+) --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -3622,6 +3622,9 @@ Params: rotation Mounting Compute Module (CSI0, i2c_vc, and cam0_reg). arducam Slow down the regulator for slow Arducam modules. + clk-continuous Switch to continuous mode on the CSI clock lane, + which increases the maximum frame rate slightly. + Appears not to work on Pi3. Name: papirus --- a/arch/arm/boot/dts/overlays/ov9281-overlay.dts +++ b/arch/arm/boot/dts/overlays/ov9281-overlay.dts @@ -70,6 +70,20 @@ }; }; + fragment@7 { + target = <&csi_ep>; + __overlay__ { + clock-noncontinuous; + }; + }; + + fragment@8 { + target = <&cam_endpoint>; + __overlay__ { + clock-noncontinuous; + }; + }; + __overrides__ { rotation = <&cam_node>,"rotation:0"; orientation = <&cam_node>,"orientation:0"; @@ -81,6 +95,7 @@ <&cam_node>, "avdd-supply:0=",<&cam0_reg>, <®_frag>, "target:0=",<&cam0_reg>; arducam = <0>, "+6"; + clk-continuous = <0>, "-7-8"; }; };