The maximum speed of SPI master is used when maximum speed of SPI slave is not specified. Also the __spi_validate function should check that transfer speeds do not exceed the master limits.
The user manual for A10 and A31 specifies maximum speed of the SPI clock as 100MHz and minimum as 3kHz. Setting the SPI clock to out-of-spec values can lock up the SoC. Signed-off-by: Michal Suchanek <[email protected]> --- drivers/spi/spi-sun4i.c | 2 ++ drivers/spi/spi-sun6i.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c index bf52b09..e1a75dd6 100644 --- a/drivers/spi/spi-sun4i.c +++ b/drivers/spi/spi-sun4i.c @@ -405,6 +405,8 @@ static int sun4i_spi_probe(struct platform_device *pdev) } sspi->master = master; + master->max_speed_hz = 100*1000*1000; + master->min_speed_hz = 3*1000; master->set_cs = sun4i_spi_set_cs; master->transfer_one = sun4i_spi_transfer_one; master->num_chipselect = 4; diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c index 1952956..0c378ff 100644 --- a/drivers/spi/spi-sun6i.c +++ b/drivers/spi/spi-sun6i.c @@ -400,6 +400,8 @@ static int sun6i_spi_probe(struct platform_device *pdev) } sspi->master = master; + master->max_speed_hz = 100*1000*1000; + master->min_speed_hz = 3*1000; master->set_cs = sun6i_spi_set_cs; master->transfer_one = sun6i_spi_transfer_one; master->num_chipselect = 4; -- 2.8.1 -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
