linux-kernel - [PATCH v3 1/2] mtd: rawnand: arasan: Update NAND bus clock instead of system clock

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Date:   Tue, 28 Jun 2022 21:18:23 +0530
From:   Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>
To:     <miquel.raynal@...tlin.com>, <nagasure@...inx.com>,
        <vigneshr@...com>
CC:     <boris.brezillon@...labora.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <git@....com>, <richard@....at>,
        <amit.kumar-mahapatra@....com>,
        Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>,
        <stable@...r.kernel.org>
Subject: [PATCH v3 1/2] mtd: rawnand: arasan: Update NAND bus clock instead of system clock

In current implementation the Arasan NAND driver is updating the
system clock(i.e., anand->clk) in accordance to the timing modes
(i.e., SDR or NVDDR). But as per the Arasan NAND controller spec the
flash clock or the NAND bus clock(i.e., nfc->bus_clk), need to be
updated instead. This patch keeps the system clock unchanged and updates
the NAND bus clock as per the timing modes.

Fixes: 197b88fecc50 ("mtd: rawnand: arasan: Add new Arasan NAND controller")
CC: stable@...r.kernel.org # 5.8+
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>
---
 drivers/mtd/nand/raw/arasan-nand-controller.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/arasan-nand-controller.c b/drivers/mtd/nand/raw/arasan-nand-controller.c
index 53bd10738418..c5264fa223c4 100644
--- a/drivers/mtd/nand/raw/arasan-nand-controller.c
+++ b/drivers/mtd/nand/raw/arasan-nand-controller.c
@@ -347,17 +347,17 @@ static int anfc_select_target(struct nand_chip *chip, int target)
 
 	/* Update clock frequency */
 	if (nfc->cur_clk != anand->clk) {
-		clk_disable_unprepare(nfc->controller_clk);
-		ret = clk_set_rate(nfc->controller_clk, anand->clk);
+		clk_disable_unprepare(nfc->bus_clk);
+		ret = clk_set_rate(nfc->bus_clk, anand->clk);
 		if (ret) {
 			dev_err(nfc->dev, "Failed to change clock rate\n");
 			return ret;
 		}
 
-		ret = clk_prepare_enable(nfc->controller_clk);
+		ret = clk_prepare_enable(nfc->bus_clk);
 		if (ret) {
 			dev_err(nfc->dev,
-				"Failed to re-enable the controller clock\n");
+				"Failed to re-enable the bus clock\n");
 			return ret;
 		}
 
-- 
2.17.1