6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefan Wahren <wahrenst@xxxxxxx>
commit ff949d981c775332be94be70397ee1df20bc68e5 upstream.
The commit 783bf5d09f86 ("spi: spi-fsl-lpspi: limit PRESCALE bit in
TCR register") doesn't implement the prescaler maximum as intended.
The maximum allowed value for i.MX93 should be 1 and for i.MX7ULP
it should be 7. So this needs also a adjustment of the comparison
in the scldiv calculation.
Fixes: 783bf5d09f86 ("spi: spi-fsl-lpspi: limit PRESCALE bit in TCR register")
Signed-off-by: Stefan Wahren <wahrenst@xxxxxxx>
Link: https://patch.msgid.link/20240905111537.90389-1-wahrenst@xxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-fsl-lpspi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -136,7 +136,7 @@ static struct fsl_lpspi_devtype_data imx
};
static struct fsl_lpspi_devtype_data imx7ulp_lpspi_devtype_data = {
- .prescale_max = 8,
+ .prescale_max = 7,
};
static const struct of_device_id fsl_lpspi_dt_ids[] = {
@@ -336,7 +336,7 @@ static int fsl_lpspi_set_bitrate(struct
div = DIV_ROUND_UP(perclk_rate, config.speed_hz);
- for (prescale = 0; prescale < prescale_max; prescale++) {
+ for (prescale = 0; prescale <= prescale_max; prescale++) {
scldiv = div / (1 << prescale) - 2;
if (scldiv < 256) {
fsl_lpspi->config.prescale = prescale;
