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. -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |
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