From: Devyn Liu <liudingyuan@xxxxxxxxxx> [ Upstream commit c3c4f22b7c814a6ee485ce294065836f8ede30fa ] The speed specified by the user is used to calculate the clk_div based on the max_speed_hz in hisi_calc_effective_speed. A very low speed value can lead to a clk_div larger than the variable range. Avoid this by setting the min_speed_hz so that such a small speed value is rejected. __spi_validate() in spi.c will return -EINVAL for the specified speed_hz lower than min_speed_hz. Signed-off-by: Devyn Liu <liudingyuan@xxxxxxxxxx> Reviewed-by: Jay Fang <f.fangjian@xxxxxxxxxx> Link: https://patch.msgid.link/20240730032040.3156393-2-liudingyuan@xxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/spi/spi-hisi-kunpeng.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/spi/spi-hisi-kunpeng.c b/drivers/spi/spi-hisi-kunpeng.c index 77e9738e42f60..6910b4d4c427b 100644 --- a/drivers/spi/spi-hisi-kunpeng.c +++ b/drivers/spi/spi-hisi-kunpeng.c @@ -495,6 +495,7 @@ static int hisi_spi_probe(struct platform_device *pdev) host->transfer_one = hisi_spi_transfer_one; host->handle_err = hisi_spi_handle_err; host->dev.fwnode = dev->fwnode; + host->min_speed_hz = DIV_ROUND_UP(host->max_speed_hz, CLK_DIV_MAX); hisi_spi_hw_init(hs); -- 2.43.0
