rpi-6.6.y - imx219 4 lane support #6618
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Commit ceddfd4 ("media: i2c: imx219: Support four-lane operation") added support for device tree to allow configuration of the sensor to use 4 lanes with a link frequency of 363MHz, and amended the advertised pixel rate to 280.8MPix/s. However it didn't change any of the PLL settings, so actually it would have been running effectively overclocked in the MIPI block, and with the frame rate and exposure calculations being wrong. The pixel rate and link frequency advertised were taken from the "Clock Setting Example" section of the datasheet. However those are based on an external clock of 12MHz, and are unachievable with a clock of 24MHz (it seems PREPLLCLK_VT_DIV and PREPLLCK_OP_DIV can ONLY be set via the automatic configuration doumented in "9-1-2 EXCK_FREQ setting depend on INCK frequency). Dropping all support for the 363MHz link frequency would cause problems for existing users, so allow it from device tree, but log a warning that the requested value is not being truly applied. Fixes: ceddfd4 ("media: i2c: imx219: Support four-lane operation") Co-developed-by: Peyton Howe <[email protected]> Signed-off-by: Peyton Howe <[email protected]> Signed-off-by: Dave Stevenson <[email protected]>
Signed-off-by: Peyton Howe <[email protected]>
This was referenced Jan 20, 2025
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kernel: imx219 support for 4 CSI2 data lanes See: raspberrypi/linux#6615 kernel: rpi-6.6.y - imx219 4 lane support See: raspberrypi/linux#6618 kernel: dtoverlays: waveshare-panel: Disable new touch controller by default See: raspberrypi/linux#6619
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kernel: imx219 support for 4 CSI2 data lanes See: raspberrypi/linux#6615 kernel: rpi-6.6.y - imx219 4 lane support See: raspberrypi/linux#6618 kernel: dtoverlays: waveshare-panel: Disable new touch controller by default See: raspberrypi/linux#6619
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6.6.y version of #6615