linux-kernel - [PATCH v2 1/3] spi: atmel: simplify MR register update in cs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250730101015.323964-1-manikandan.m@microchip.com>
Date: Wed, 30 Jul 2025 15:40:13 +0530
From: Manikandan Muralidharan <manikandan.m@...rochip.com>
To: <broonie@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
	<alexandre.belloni@...tlin.com>, <claudiu.beznea@...on.dev>,
	<ryan.wanner@...rochip.com>, <tudor.ambarus@...aro.org>,
	<linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC: <manikandan.m@...rochip.com>
Subject: [PATCH v2 1/3] spi: atmel: simplify MR register update in cs_activate()

simplified the MR register configuration by updating only the PCS field
using SPI_BFINS() instead of rewriting the entire register.
Avoids code duplication.

Signed-off-by: Manikandan Muralidharan <manikandan.m@...rochip.com>
---
changes in v2:
 - Fixed mail threading
---
 drivers/spi/spi-atmel.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 89a6b46cd319..409f544d8983 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -397,20 +397,10 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 		 * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS
 		 */
 		spi_writel(as, CSR0, asd->csr);
-		if (as->caps.has_wdrbt) {
-			spi_writel(as, MR,
-					SPI_BF(PCS, ~(0x01 << chip_select))
-					| SPI_BIT(WDRBT)
-					| SPI_BIT(MODFDIS)
-					| SPI_BIT(MSTR));
-		} else {
-			spi_writel(as, MR,
-					SPI_BF(PCS, ~(0x01 << chip_select))
-					| SPI_BIT(MODFDIS)
-					| SPI_BIT(MSTR));
-		}
 
 		mr = spi_readl(as, MR);
+		mr = SPI_BFINS(PCS, ~(0x01 << chip_select), mr);
+		spi_writel(as, MR, mr);
 
 		/*
 		 * Ensures the clock polarity is valid before we actually

base-commit: 4b290aae788e06561754b28c6842e4080957d3f7
-- 
2.25.1