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We now have the hardware I2C controller pinmuxed to the drive the display I2C, but this controller does not support clock stretching. The Atmel micro-controller in the panel requires clock stretching to allow it to prepare any data to be read. Split the rpi_touchscreen_i2c_read into two independent transactions with a delay between them for the Atmel to prepare the data. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> drm/panel/raspberrypi-ts: Insert delay before polling for startup state In switching to the hardware I2C controller there is an issue where we seem to not get back the correct state from the Pi touchscreen. Insert a delay before polling to avoid this condition. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> drm/panel/raspberrypi-touchscreen: Handle I2C errors. rpi_touchscreen_i2c_read returns any errors from i2c_transfer, or the 8 bit received value. Check for error values before trying to process the data as valid. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> drm/panel/raspberrypi-touchscreen: Insert more delays. This avoids failures in cases where the panel is enabled or re-probed very soon after being disabled or probed. These can occur because the Atmel device can mis-behave over I2C for a few ms after any write to the POWERON register.
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.
Build status for rpi-6.1.y:
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