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| author | Marek Vasut <marex@denx.de> | 2022-08-23 23:22:16 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-11-25 08:42:24 +0000 |
| commit | 0958944a93058bfec7d9032518abd7d646009b17 (patch) | |
| tree | 9c12c6b56d5baafc09c2d9d16c7725e985245627 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | media: dt-bindings: Use new video interface bus type macros in examples (diff) | |
| download | linux-0958944a93058bfec7d9032518abd7d646009b17.tar.gz linux-0958944a93058bfec7d9032518abd7d646009b17.zip | |
media: mt9p031: Increase post-reset delay
The MT9P006 sensor driver sporadically fails to probe because the sensor
responds with a NACK condition to I2C address on the bus during an attempt
to read the sensor MT9P031_CHIP_VERSION register in mt9p031_registered().
Neither the MT9P006 nor MT9P031 datasheets are clear on reset signal timing.
Older MT9M034 [1] datasheet provides those timing figures in Appendix-A and
indicates it is necessary to wait 850000 EXTCLK cycles before starting any
I2C communication.
Add such a delay, which does make the sporadic I2C NACK go away, so it is
likely similar constraint applies to this sensor.
[1] https://www.onsemi.com/pdf/datasheet/mt9m034-d.pdf
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions