Dear Wolfram Sang, > On Thu, Nov 22, 2012 at 01:50:37AM +0100, Marek Vasut wrote: > > 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 > > It's fine if you do this yourself. I'll submit some separate patch then ... something like "i2c: mxs: hostile takeover of the driver, kekeke" ;-) Anyway, please review this one as is, it should be mostly ok to apply I hope ... 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
