This is a note to let you know that I've just added the patch titled
spi: hisi-kunpeng: Add validation for the minimum value of speed_hz
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-hisi-kunpeng-add-validation-for-the-minimum-valu.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 09ec26f43ea28dd902434f08da5c7a8fb3a7d1f4
Author: Devyn Liu <liudingyuan@xxxxxxxxxx>
Date: Tue Jul 30 11:20:39 2024 +0800
spi: hisi-kunpeng: Add validation for the minimum value of speed_hz
[ 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>
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);
