Dear Marek Vasut, > Add support for the PIO mode and mixed PIO/DMA mode support. The mixed > PIO/DMA is the default mode of operation. This shall leverage overhead > that the driver creates due to setting up DMA descriptors even for very > short transfers. > > The current boundary between PIO/DMA 8 bytes, transfers shorter than 8 > bytes are transfered by PIO, longer transfers use DMA. The performance > of write transfers remains unchanged, while there is a minor improvement > of read performance. Reading 16KB EEPROM with DMA-only operations gives > a read speed of 39.5KB/s, while with then new mixed-mode the speed is > blazing 40.6KB/s. > > Signed-off-by: Marek Vasut <marex@xxxxxxx> > Cc: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> > Cc: Shawn Guo <shawn.guo@xxxxxxxxxx> > Cc: Wolfram Sang <w.sang@xxxxxxxxxxxxxx> [...] btw. Wolfram, you might want to drop me some credit into the MX28 i2c driver, I suspect most of the code in there is mine now anyway :-D Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
