On Mon, Mar 08, 2021 at 04:54:58PM +0200, Alexandru Ardelean wrote:
> The intent is the removal of the 'delay_usecs' field from the
> spi_transfer struct, as there is a 'delay' field that does the same
> thing.
>
> The spi_delay_to_ns() can be used to get the transfer delay. It works by
> using the 'delay_usecs' field first (if it is non-zero), and finally
> uses the 'delay' field.
>
> Since the 'delay_usecs' field is going away, this change makes use of the
> spi_delay_to_ns() function. This also means dividing the return value of
> the function by 1000, to convert it to microseconds.
> To prevent any potential faults when converting to microseconds and since
> the result of spi_delay_to_ns() is int, the delay is being computed in 32
> bits and then clamped between 0 & U16_MAX.
>
> Signed-off-by: Alexandru Ardelean <aardelean@xxxxxxxxxxx>
> ---
> drivers/staging/greybus/spilib.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/greybus/spilib.c b/drivers/staging/greybus/spilib.c
> index 672d540d3365..30655153df6a 100644
> --- a/drivers/staging/greybus/spilib.c
> +++ b/drivers/staging/greybus/spilib.c
> @@ -245,6 +245,7 @@ static struct gb_operation *gb_spi_operation_create(struct gb_spilib *spi,
> /* Fill in the transfers array */
> xfer = spi->first_xfer;
> while (msg->state != GB_SPI_STATE_OP_DONE) {
> + int xfer_delay;
> if (xfer == spi->last_xfer)
> xfer_len = spi->last_xfer_size;
> else
> @@ -259,7 +260,9 @@ static struct gb_operation *gb_spi_operation_create(struct gb_spilib *spi,
>
> gb_xfer->speed_hz = cpu_to_le32(xfer->speed_hz);
> gb_xfer->len = cpu_to_le32(xfer_len);
> - gb_xfer->delay_usecs = cpu_to_le16(xfer->delay_usecs);
> + xfer_delay = spi_delay_to_ns(&xfer->delay, xfer) / 1000;
> + xfer_delay = clamp_t(u16, xfer_delay, 0, U16_MAX);
> + gb_xfer->delay_usecs = cpu_to_le16(xfer_delay);
> gb_xfer->cs_change = xfer->cs_change;
> gb_xfer->bits_per_word = xfer->bits_per_word;
>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
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