linux-kernel - [PATCH 5.4 059/222] mtd: rawnand: gpmi: Restore nfc timing setup after suspend/resume

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Date:   Wed, 22 Jan 2020 10:27:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Esben Haabendal <esben@...nix.com>,
        Han Xu <han.xu@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 5.4 059/222] mtd: rawnand: gpmi: Restore nfc timing setup after suspend/resume

From: Esben Haabendal <esben@...nix.com>

commit d70486668cdf51b14a50425ab45fc18677a167b2 upstream.

As we reset the GPMI block at resume, the timing parameters setup by a
previous exec_op is lost.  Rewriting GPMI timing registers on first exec_op
after resume fixes the problem.

Fixes: ef347c0cfd61 ("mtd: rawnand: gpmi: Implement exec_op")
Cc: stable@...r.kernel.org
Signed-off-by: Esben Haabendal <esben@...nix.com>
Acked-by: Han Xu <han.xu@....com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -2727,6 +2727,10 @@ static int gpmi_pm_resume(struct device
 		return ret;
 	}
 
+	/* Set flag to get timing setup restored for next exec_op */
+	if (this->hw.clk_rate)
+		this->hw.must_apply_timings = true;
+
 	/* re-init the BCH registers */
 	ret = bch_set_geometry(this);
 	if (ret) {