Re: [PATCH v1] spi: geni-qcom: Fix CPHA and CPOL mode change detection

[Jonathan Marek <jonathan@marek.ca>]

Reviewed-by: Jonathan Marek <jonathan@marek.ca>

at least it doesn't look like this stupid mistake breaks anything 
upstream (no spi-cpha/spi-cpol in any qcom dts)

On 3/16/26 9:23 AM, Maramaina Naresh wrote:
> setup_fifo_params computes mode_changed from spi->mode flags but tests
> it against SE_SPI_CPHA and SE_SPI_CPOL, which are register offsets,
> not SPI mode bits. This causes CPHA and CPOL updates to be skipped
> on mode switches, leaving the controller with stale clock phase
> and polarity settings.
> 
> Fix this by using SPI_CPHA and SPI_CPOL to detect mode changes before
> updating the corresponding registers.
> 
> Fixes: 781c3e71c94c ("spi: spi-geni-qcom: rework setup_fifo_params")
> Signed-off-by: Maramaina Naresh <naresh.maramaina@oss.qualcomm.com>
> ---
> This patch fixes SPI mode change detection in the spi-geni-qcom driver.
> 
> setup_fifo_params compared spi->mode against SE_SPI_CPHA/SE_SPI_CPOL,
> which are register offsets instead of SPI_CPHA/SPI_CPOL mode bits.
> This could skip CPHA/CPOL updates on mode switches and leave stale
> clock configuration.
> 
> This is a single-patch series.
> ---
>   drivers/spi/spi-geni-qcom.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
> index 43ce47f2454c..772b7148ba5f 100644
> --- a/drivers/spi/spi-geni-qcom.c
> +++ b/drivers/spi/spi-geni-qcom.c
> @@ -359,9 +359,9 @@ static int setup_fifo_params(struct spi_device *spi_slv,
>   		writel((spi_slv->mode & SPI_LOOP) ? LOOPBACK_ENABLE : 0, se->base + SE_SPI_LOOPBACK);
>   	if (cs_changed)
>   		writel(chipselect, se->base + SE_SPI_DEMUX_SEL);
> -	if (mode_changed & SE_SPI_CPHA)
> +	if (mode_changed & SPI_CPHA)
>   		writel((spi_slv->mode & SPI_CPHA) ? CPHA : 0, se->base + SE_SPI_CPHA);
> -	if (mode_changed & SE_SPI_CPOL)
> +	if (mode_changed & SPI_CPOL)
>   		writel((spi_slv->mode & SPI_CPOL) ? CPOL : 0, se->base + SE_SPI_CPOL);
>   	if ((mode_changed & SPI_CS_HIGH) || (cs_changed && (spi_slv->mode & SPI_CS_HIGH)))
>   		writel((spi_slv->mode & SPI_CS_HIGH) ? BIT(chipselect) : 0, se->base + SE_SPI_DEMUX_OUTPUT_INV);
> 
> ---
> base-commit: 7109a2155340cc7b21f27e832ece6df03592f2e8
> change-id: 20260316-spi-geni-cpha-cpol-fix-89126ed55325
> 
> Best regards,
>