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[ Upstream commit f1a64f56663e9d03e509439016dcbddd0166b2da ] From the measured hardware signal, OV5695 reset pin goes high for a short period of time during boot-up. From the sensor specification, the reset pin is active low and the DT binding defines the pin as active low, which means that the values set by the driver are inverted and thus the value requested in probe ends up high. Fix it by changing probe to request the reset GPIO initialized to high, which makes the initial state of the physical signal low. In addition, DOVDD rising must occur before DVDD rising from spec., but regulator_bulk_enable() API enables all the regulators asynchronously. Use an explicit loops of regulator_enable() instead. For power off sequence, it is required that DVDD falls first. Given the bulk API does not give any guarantee about the order of regulators, change the driver to use regulator_disable() instead. The sensor also requires a delay between reset high and first I2C transaction, which was assumed to be 8192 XVCLK cycles, but 1ms is recommended by the vendor. Fix this as well. Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com> Signed-off-by: Tomasz Figa <tfiga@chromium.org> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.