From: Marcin Wojtas mw@semihalf.com
This patch adds a limitation in the kirkwood_spi driver set_speed hook, which prevents setting too high transfer speed.
Signed-off-by: Marcin Wojtas mw@semihalf.com Reviewed-by: Kostya Porotchkin kostap@marvell.com Tested-by: Kostya Porotchkin kostap@marvell.com Signed-off-by: Stefan Roese sr@denx.de ---
drivers/spi/kirkwood_spi.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/spi/kirkwood_spi.c b/drivers/spi/kirkwood_spi.c index 3dc62f351a06..063ed5f35a3a 100644 --- a/drivers/spi/kirkwood_spi.c +++ b/drivers/spi/kirkwood_spi.c @@ -110,10 +110,17 @@ static int _spi_xfer(struct kwspi_registers *reg, unsigned int bitlen, static int mvebu_spi_set_speed(struct udevice *bus, uint hz) { struct mvebu_spi_plat *plat = dev_get_plat(bus); + struct dm_spi_bus *spi = dev_get_uclass_priv(bus); struct kwspi_registers *reg = plat->spireg; u32 data, divider; unsigned int spr, sppr;
+ if (hz > spi->max_hz) { + debug("%s: limit speed to the max_hz of the bus %d\n", + __func__, spi->max_hz); + hz = spi->max_hz; + } + /* * Calculate spi clock prescaller using max_hz. * SPPR is SPI Baud Rate Pre-selection, it holds bits 5 and 7:6 in