Re: [PATCH V19 5/7] i2c: tegra: Add DMA support

2019-02-20 Thread Dmitry Osipenko
20.02.2019 21:02, Jon Hunter пишет: > > On 12/02/2019 19:06, Sowjanya Komatineni wrote: >> This patch adds DMA support for Tegra I2C. >> >> Tegra I2C TX and RX FIFO depth is 8 words. PIO mode is used for >> transfer size of the max FIFO depth and DMA mode is used for >> transfer size higher than

Re: [PATCH V19 5/7] i2c: tegra: Add DMA support

2019-02-20 Thread Jon Hunter
On 12/02/2019 19:06, Sowjanya Komatineni wrote: > This patch adds DMA support for Tegra I2C. > > Tegra I2C TX and RX FIFO depth is 8 words. PIO mode is used for > transfer size of the max FIFO depth and DMA mode is used for > transfer size higher than max FIFO depth to save CPU overhead. > >

Re: [PATCH V19 5/7] i2c: tegra: Add DMA support

2019-02-14 Thread Wolfram Sang
On Tue, Feb 12, 2019 at 11:06:46AM -0800, Sowjanya Komatineni wrote: > This patch adds DMA support for Tegra I2C. > > Tegra I2C TX and RX FIFO depth is 8 words. PIO mode is used for > transfer size of the max FIFO depth and DMA mode is used for > transfer size higher than max FIFO depth to save

[PATCH V19 5/7] i2c: tegra: Add DMA support

2019-02-12 Thread Sowjanya Komatineni
This patch adds DMA support for Tegra I2C. Tegra I2C TX and RX FIFO depth is 8 words. PIO mode is used for transfer size of the max FIFO depth and DMA mode is used for transfer size higher than max FIFO depth to save CPU overhead. PIO mode needs full intervention of CPU to fill or empty FIFO's