linux-kernel - [PATCH 3/4] spi: atmel-quadspi: Write QSPI

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Date:   Mon, 7 Dec 2020 15:59:58 +0200
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <broonie@...nel.org>, <linux-spi@...r.kernel.org>
CC:     <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>, <bugalski.piotr@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        "Tudor Ambarus" <tudor.ambarus@...rochip.com>
Subject: [PATCH 3/4] spi: atmel-quadspi: Write QSPI_IAR only when needed

The address must be written in QSPI_IAR only when we have
a instruction frame with address but no data.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/spi/atmel-quadspi.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
index 30533ab82c7b..5fd0dc70bd74 100644
--- a/drivers/spi/atmel-quadspi.c
+++ b/drivers/spi/atmel-quadspi.c
@@ -385,9 +385,11 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq,
 	/* Clear pending interrupts */
 	(void)atmel_qspi_read(aq, QSPI_SR);
 
-	if (aq->caps->has_ricr) {
-		/* Set QSPI Instruction Frame registers */
+	/* Set QSPI Instruction Frame registers. */
+	if (op->addr.nbytes && !op->data.nbytes)
 		atmel_qspi_write(iar, aq, QSPI_IAR);
+
+	if (aq->caps->has_ricr) {
 		if (op->data.dir == SPI_MEM_DATA_IN)
 			atmel_qspi_write(icr, aq, QSPI_RICR);
 		else
@@ -397,8 +399,6 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq,
 		if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
 			ifr |= QSPI_IFR_SAMA5D2_WRITE_TRSFR;
 
-		/* Set QSPI Instruction Frame registers */
-		atmel_qspi_write(iar, aq, QSPI_IAR);
 		atmel_qspi_write(icr, aq, QSPI_ICR);
 		atmel_qspi_write(ifr, aq, QSPI_IFR);
 	}
-- 
2.25.1