On 03/19/2015 07:28 PM, Greg Knight wrote: > Changing DMA_MIN_BYTES to, say, "dma_min_time_ms" sounds reasonable to > me. I don't know how to compute it completely accurately as some SPI > implementations I've seen seem to like to inject little delays between > bytes for some reason, but a reasonable enough estimate should just be > spi_transfer_time_ms = (bits * 1000) / spi_clock_speed. > > I would like to have the ability to configure it without a kernel > recompile, though. Would a kernel param (module_param) be acceptable for > this application? Or sysfs interface as Mark suggested? But module_param should work as well. > You don't happen to know the WL12xx SPI clock speed off the top of your > head, do you? In case of n900 it is 48000000 (board-rx51-peripherals.c). It is using 32bit words over SPI. Based on this and your experience I guess it is possible to come up with a formula which satisfy both. > Regards, > Greg > -- Péter -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
