Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit
On Mon, May 30, 2016 at 10:57:10AM +0200, Michal Suchanek wrote: > Hello, > > On 30 May 2016 at 10:37, Maxime Ripard > wrote: > > On Thu, May 26, 2016 at 07:25:24PM -, Michal Suchanek wrote: > >> The sun4i spi hardware can trasfer at most 63 bytes of data without DMA > >> support so report the limitation. Same on sun6i. > > > > Is it? Is there timeouts on the A31 and later SoCs? > > > > I have no sun6i hardware to test with. > > This is an advisory limit you can query and it better be smaller > rather than unreliable. The hard limit in the driver is still > SUN6I_FIFO_DEPTH (which is 128 bytes on sun6i). > > You can test his without any actual SPI device. Unused pins you can > multiplex as SPI suffice. Ok, for the time being: Acked-by: Maxime Ripard Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com signature.asc Description: PGP signature
Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit
Hello, On 30 May 2016 at 10:37, Maxime Ripard wrote: > On Thu, May 26, 2016 at 07:25:24PM -, Michal Suchanek wrote: >> The sun4i spi hardware can trasfer at most 63 bytes of data without DMA >> support so report the limitation. Same on sun6i. > > Is it? Is there timeouts on the A31 and later SoCs? > I have no sun6i hardware to test with. This is an advisory limit you can query and it better be smaller rather than unreliable. The hard limit in the driver is still SUN6I_FIFO_DEPTH (which is 128 bytes on sun6i). You can test his without any actual SPI device. Unused pins you can multiplex as SPI suffice. Thanks Michal
Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit
On Thu, May 26, 2016 at 07:25:24PM -, Michal Suchanek wrote: > The sun4i spi hardware can trasfer at most 63 bytes of data without DMA > support so report the limitation. Same on sun6i. Is it? Is there timeouts on the A31 and later SoCs? Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com signature.asc Description: PGP signature
