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Due to a HW bug in the Tegra20 SoC a udelay needs to be added after the first byte has been sent to the EC (I2C master). Move it to the correct position and add a comment that it should not be replaced by usleep_range. Signed-off-by: Marc Dietrich <marvin24@gmx.de> Link: https://patch.msgid.link/20260103101439.14863-1-marvin24@gmx.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
NVEC: An NVidia compliant Embedded Controller Protocol Implementation This is an implementation of the NVEC protocol used to communicate with an embedded controller (EC) via I2C bus. The EC is an I2C master while the host processor is the I2C slave. Requests from the host processor to the EC are started by triggering a gpio line. There is no written documentation of the protocol available to the public, but the source code[1] of the published nvec reference drivers can be a guide. This driver is currently only used by the AC100 project[2], but it is likely, that other Tegra boards (not yet mainlined, if ever) also use it. [1] e.g. https://nv-tegra.nvidia.com/gitweb/?p=linux-2.6.git;a=tree;f=arch/arm/mach-tegra/nvec;hb=android-tegra-2.6.32 [2] http://gitorious.org/ac100, http://launchpad.net/ac100