linux-kernel - [PATCH 06/10] staging: greybus: spilib: use 'spi_delay_to

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Date:   Mon,  8 Mar 2021 16:54:58 +0200
From:   Alexandru Ardelean <aardelean@...iqon.com>
To:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-tegra@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Cc:     broonie@...nel.org, gregkh@...uxfoundation.org, elder@...nel.org,
        johan@...nel.org, vireshk@...nel.org, rmfrfs@...il.com,
        f.fainelli@...il.com, ldewangan@...dia.com,
        thierry.reding@...il.com, jonathanh@...dia.com, linux@...iqon.com,
        Alexandru Ardelean <aardelean@...iqon.com>
Subject: [PATCH 06/10] staging: greybus: spilib: use 'spi_delay_to_ns' for getting xfer delay

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@...iqon.com>
---
 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;
 
-- 
2.29.2