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7b1d87af14
This adds a new spi_optimize_message() function that can be used to optimize SPI messages that are used more than once. Peripheral drivers that use the same message multiple times can use this API to perform SPI message validation and controller-specific optimizations once and then reuse the message while avoiding the overhead of revalidating the message on each spi_(a)sync() call. Internally, the SPI core will also call this function for each message if the peripheral driver did not explicitly call it. This is done to so that controller drivers don't have to have multiple code paths for optimized and non-optimized messages. A hook is provided for controller drivers to perform controller-specific optimizations. Suggested-by: Martin Sperl <kernel@martin.sperl.org> Link: https://lore.kernel.org/linux-spi/39DEC004-10A1-47EF-9D77-276188D2580C@martin.sperl.org/ Signed-off-by: David Lechner <dlechner@baylibre.com> Link: https://msgid.link/r/20240219-mainline-spi-precook-message-v2-1-4a762c6701b9@baylibre.com Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Mark Brown <broonie@kernel.org> |
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