linux-kernel - [PATCH v1] mtd: rawnand: meson: initialize clock register

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Message-ID: <20231109054037.3864802-1-avkrasnov@salutedevices.com>
Date:   Thu, 9 Nov 2023 08:40:37 +0300
From:   Arseniy Krasnov <avkrasnov@...utedevices.com>
To:     Liang Yang <liang.yang@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     <oxffffaa@...il.com>, <kernel@...rdevices.ru>,
        Arseniy Krasnov <avkrasnov@...utedevices.com>,
        <linux-mtd@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v1] mtd: rawnand: meson: initialize clock register

Clock register must be also initialized during controller probing. If
this is not performed (for example by bootloader before) - controller
will not work.

Signed-off-by: Arseniy Krasnov <avkrasnov@...utedevices.com>
---
 drivers/mtd/nand/raw/meson_nand.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index 0d4d358152d7..4e7fa943928c 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -91,6 +91,8 @@
 
 /* eMMC clock register, misc control */
 #define CLK_SELECT_NAND		BIT(31)
+#define CLK_ALWAYS_ON_NAND      BIT(24)
+#define CLK_ENABLE_VALUE        0x245
 
 #define NFC_CLK_CYCLE		6
 
@@ -1152,7 +1154,7 @@ static int meson_nfc_clk_init(struct meson_nfc *nfc)
 		return PTR_ERR(nfc->nand_clk);
 
 	/* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
-	writel(CLK_SELECT_NAND | readl(nfc->reg_clk),
+	writel(CLK_ALWAYS_ON_NAND | CLK_SELECT_NAND | CLK_ENABLE_VALUE,
 	       nfc->reg_clk);
 
 	ret = clk_prepare_enable(nfc->core_clk);
-- 
2.35.0