linux-kernel - [PATCH 1/2] mtd: rawnand: gpmi: Remove explicit default gpmi clock setting for i.MX6

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Date:   Tue, 2 Nov 2021 21:20:21 +0100
From:   Christian Eggers <ceggers@...i.de>
To:     Michael Trimarchi <michael@...rulasolutions.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Stefan Riedmueller <S.Riedmueller@...tec.de>,
        Han Xu <han.xu@....com>, Greg Ungerer <gerg@...nel.org>
CC:     Sascha Hauer <s.hauer@...gutronix.de>,
        Christian Hemp <C.Hemp@...tec.de>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Stefan Riedmueller <s.riedmueller@...tec.de>,
        <stable@...r.kernel.org>
Subject: [PATCH 1/2] mtd: rawnand: gpmi: Remove explicit default gpmi clock setting for i.MX6

From: Stefan Riedmueller <s.riedmueller@...tec.de>

There is no need to explicitly set the default gpmi clock rate during
boot for the i.MX 6 since this is done during nand_detect anyway.

Signed-off-by: Stefan Riedmueller <s.riedmueller@...tec.de>
Cc: stable@...r.kernel.org
---
@stable: This patch fixes a bug because this (superfluous) call to
         clk_set_rate() misses the required clock gating. The resulting
         clock glitches can prevent the system from booting.

Changelog:
-----------
RFC --> v1
- Cc: stable@...r.kernel.org

 drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
index 4d08e4ab5c1b..a1f7000f033e 100644
--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -1034,15 +1034,6 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
 		r->clock[i] = clk;
 	}
 
-	if (GPMI_IS_MX6(this))
-		/*
-		 * Set the default value for the gpmi clock.
-		 *
-		 * If you want to use the ONFI nand which is in the
-		 * Synchronous Mode, you should change the clock as you need.
-		 */
-		clk_set_rate(r->clock[0], 22000000);
-
 	return 0;
 
 err_clock:
-- 
Christian Eggers
Embedded software developer

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