linux-kernel - [PATCH 0/4] media: i2c: imx219: Enable variable xclk and 4-lane

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Message-Id: <20220412135534.2796158-1-aford173@gmail.com>
Date:   Tue, 12 Apr 2022 08:55:29 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-media@...r.kernel.org
Cc:     prabhakar.mahadev-lad.rj@...renesas.com, tharvey@...eworks.com,
        cstevens@...conembedded.com, aford@...conembedded.com,
        laurent.pinchart@...asonboard.com, Adam Ford <aford173@...il.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] media: i2c: imx219: Enable variable xclk and 4-lane

The driver currently only supports a 2-lane camera, a fixed external 
clock (XCLK) at 24MHz, a fixed Pixel Rate of 182.4MHz, and a fixed
link rate of 456MHz.  There are a bunch of hard-codec values in a 
table of operating modes which expect the above to be true.

According to the datasheet, the driver is capable of operating in 
either 4-lane with a pixel rate of 280.8MHz and Linux frequency
of 702MHz or 2-lane configured as stated above.  The XCLK can be 
anywhere from 6MHz - 27MHz instead of being fixed at 24MHz.

Split up the hard-coded values into smaller helper functions that
dynamically set the registers of the camera based on the XCLK and
desired number of lanes.

This series was tested on a Beacon RZ/G2M streaming video at 640x480
to an LCD with fbdevsink

media-ctl --links "'rcar_csi2 feaa0000.csi2':1->'VIN0 output':0[1]" -d /dev/media1
media-ctl --set-v4l2 "'imx219 2-0010':0[fmt:SRGGB8_1X8/640x480 field:none]" -d /dev/media1
yavta -w '0x009f0905 2048' /dev/v4l-subdev12
gst-launch-1.0 v4l2src device=/dev/video7 ! video/x-bayer,width=640,height=480,format=rggb ! queue ! bayer2rgb ! fbdevsink

Due to hardware limitations, the XCLK is still 24MHz, so anyone
willing to test this series with a different XCLK would be appreciated.

Due to the video format, streaming video at larger resolution was
not feasible, however individual frames captured at 1920x1080 were
successful.

Adam Ford (4):
  media: i2c: imx219: Split common registers from mode tables
  media: i2c: imx219: Support four-lane operation
  media: i2c: imx219: Enable variable XCLK
  media: i2c: imx219: Create DPHY helper function

 drivers/media/i2c/imx219.c | 340 +++++++++++++++++++++++--------------
 1 file changed, 213 insertions(+), 127 deletions(-)

-- 
2.34.1