> +#define STM32F7_I2C_DMA_LEN_MIN 0x1
...
> + if (i2c_dev->dma && f7_msg->count >= STM32F7_I2C_DMA_LEN_MIN) {
Are you using DMA for every message with a length >= 1? The setup of
that might be more expensive than the DMA gain, if so.
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