From: Michal Suchanek Date: Tue, 14 Jun 2016 12:10:04 +0000 (+0000) Subject: spi: sunxi: set maximum and minimum speed of SPI master X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0b06d8cf4f9307887d52776d77bdbc8d6dd9d98d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git spi: sunxi: set maximum and minimum speed of SPI master The speed limits are unset in the sun4i and sun6i SPI drivers. 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 -- v2: new patch v3: fix constant style Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c index 07ce7c97750e..d02cf9829f1a 100644 --- a/drivers/spi/spi-sun4i.c +++ b/drivers/spi/spi-sun4i.c @@ -392,6 +392,8 @@ 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 6fa6ff12ae61..d5a6a2e5f54a 100644 --- a/drivers/spi/spi-sun6i.c +++ b/drivers/spi/spi-sun6i.c @@ -390,6 +390,8 @@ 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;