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56 lines
2.1 KiB
Diff
56 lines
2.1 KiB
Diff
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From 0fec1c81707f5335d0b04b5e97d2ddd0b902377b Mon Sep 17 00:00:00 2001
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From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
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Date: Tue, 10 Mar 2020 14:17:07 +0100
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Subject: [PATCH] media: i2c: imx219: Fix power sequence
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Commit ca45448a56659c6df6e0436188e97f6cc65dea8a upstream.
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When supporting Rpi Camera v2 Module on the RZ/G2E, found the driver had
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some issues with rcar mipi-csi driver. The sensor never entered into LP-11
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state.
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The powerup sequence in the datasheet[1] shows the sensor entering into
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LP-11 in streaming mode, so to fix this issue transitions are performed
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from "streaming -> standby" in the probe() after power up.
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With this commit the sensor is able to enter LP-11 mode during power up,
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as expected by some CSI-2 controllers.
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[1] https://publiclab.org/system/images/photos/000/023/294/original/
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RASPBERRY_PI_CAMERA_V2_DATASHEET_IMX219PQH5_7.0.0_Datasheet_XXX.PDF
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Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
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Acked-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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---
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drivers/media/i2c/imx219.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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--- a/drivers/media/i2c/imx219.c
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+++ b/drivers/media/i2c/imx219.c
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@@ -1224,6 +1224,23 @@ static int imx219_probe(struct i2c_clien
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/* Set default mode to max resolution */
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imx219->mode = &supported_modes[0];
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+ /* sensor doesn't enter LP-11 state upon power up until and unless
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+ * streaming is started, so upon power up switch the modes to:
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+ * streaming -> standby
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+ */
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+ ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
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+ IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
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+ if (ret < 0)
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+ goto error_power_off;
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+ usleep_range(100, 110);
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+
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+ /* put sensor back to standby mode */
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+ ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
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+ IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
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+ if (ret < 0)
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+ goto error_power_off;
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+ usleep_range(100, 110);
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+
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ret = imx219_init_controls(imx219);
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if (ret)
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goto error_power_off;
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