Commit feb8831b authored by Jason Chen's avatar Jason Chen Committed by Mauro Carvalho Chehab
Browse files

media: ov08x40: Reduce start streaming time 



Because video duration involves calculating the streaming time, and i2c
communication incurs too many XTALK register settings every 4 bytes with
i2c START and STOP.

So we have opted switch to the i2c burst method.
This method involves writing the XTALK registers in the order of
the register block.

The start streaming time can be reduced from around 400ms to 150ms

[Sakari Ailus: Drop unneeded dev_dbg().]

Signed-off-by: default avatarJason Chen <jason.z.chen@intel.com>
Reviewed-by: default avatarSergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
parent eea8f730

Documentation/devicetree/bindings/media/video-interfaces.yaml

+1 −1
Original line number Diff line number Diff line
@@ -190,7 +190,7 @@ properties: 
      Allow MIPI CSI-2 non-continuous clock mode.



  link-frequencies:

    $ref: /schemas/types.yaml#/definitions/uint64-array

    $ref: /schemas/types.yaml#/definitions/uint32-array

    description:

      Allowed data bus frequencies. For MIPI CSI-2, for instance, this is the

      actual frequency of the bus, not bits per clock per lane value. An array

arch/arm/boot/dts/ti/omap/omap3-n9.dts

+1 −1
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ smia_1: camera@10 { 
		flash-leds = <&as3645a_flash &as3645a_indicator>;

		port {

			smia_1_1: endpoint {

				link-frequencies = /bits/ 64 <199200000 210000000 499200000>;

				link-frequencies = /bits/ 32 <199200000 210000000 499200000>;

				clock-lanes = <0>;

				data-lanes = <1 2>;

				remote-endpoint = <&csi2a_ep>;

drivers/media/i2c/ov08x40.c

+57 −1152

File changed.

Preview size limit exceeded, changes collapsed.