linux-kernel - [PATCH v4 10/19] spi: tegra114: use `spi_transfer_delay

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Date:   Thu, 26 Sep 2019 13:51:38 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <bcm-kernel-feedback-list@...adcom.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>
CC:     <jic23@...nel.org>, <broonie@...nel.org>, <f.fainelli@...il.com>,
        <linus.walleij@...aro.org>, <orsonzhai@...il.com>,
        <baolin.wang@...aro.org>, <zhang.lyra@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v4 10/19] spi: tegra114: use `spi_transfer_delay_exec` helper

The tegra114 driver has a weird/separate `tegra_spi_transfer_delay()`
function that does 2 delays: one mdelay() and one udelay().

This was introduced via commit f4fade12d506e14867a2b0a5e2f7aaf227297d8b
("spi/tegra114: Correct support for cs_change").

There doesn't seem to be a mention in that commit message to suggest a
specific need/use-case for having the 2 delay calls.
For the most part, udelay() should be sufficient.

This change replaces it with the new `spi_transfer_delay_exec()`, which
should do the same thing.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/spi/spi-tegra114.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index 39374c2edcf3..8133dc49d34f 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -984,17 +984,6 @@ static int tegra_spi_setup(struct spi_device *spi)
 	return 0;
 }
 
-static void tegra_spi_transfer_delay(int delay)
-{
-	if (!delay)
-		return;
-
-	if (delay >= 1000)
-		mdelay(delay / 1000);
-
-	udelay(delay % 1000);
-}
-
 static void tegra_spi_transfer_end(struct spi_device *spi)
 {
 	struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
@@ -1098,7 +1087,7 @@ static int tegra_spi_transfer_one_message(struct spi_master *master,
 complete_xfer:
 		if (ret < 0 || skip) {
 			tegra_spi_transfer_end(spi);
-			tegra_spi_transfer_delay(xfer->delay_usecs);
+			spi_transfer_delay_exec(xfer);
 			goto exit;
 		} else if (list_is_last(&xfer->transfer_list,
 					&msg->transfers)) {
@@ -1106,11 +1095,11 @@ static int tegra_spi_transfer_one_message(struct spi_master *master,
 				tspi->cs_control = spi;
 			else {
 				tegra_spi_transfer_end(spi);
-				tegra_spi_transfer_delay(xfer->delay_usecs);
+				spi_transfer_delay_exec(xfer);
 			}
 		} else if (xfer->cs_change) {
 			tegra_spi_transfer_end(spi);
-			tegra_spi_transfer_delay(xfer->delay_usecs);
+			spi_transfer_delay_exec(xfer);
 		}
 
 	}
-- 
2.20.1