From ab3ab7b654ae69a9c5c259ecd281543c6234437f Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Sat, 26 Jan 2019 14:10:56 +0100
Subject: [PATCH] mtd: rawnand: fsmc: Disable NAND on remove()
This disables the NAND on remove() and the errorpath,
making sure the chipselect gets deasserted when the
NAND is not in use.
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/mtd/nand/raw/fsmc_nand.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/mtd/nand/raw/fsmc_nand.c b/drivers/mtd/nand/raw/fsmc_nand.c
index 9dc0e5b648b1..0c31089215d4 100644
--- a/drivers/mtd/nand/raw/fsmc_nand.c
+++ b/drivers/mtd/nand/raw/fsmc_nand.c
@@ -986,6 +986,19 @@ static const struct nand_controller_ops fsmc_nand_controller_ops = {
.setup_data_interface = fsmc_setup_data_interface,
};
+/**
+ * fsmc_nand_disable() - Disables the NAND bank
+ * @host: The instance to disable
+ */
+static void fsmc_nand_disable(struct fsmc_nand_data *host)
+{
+ u32 val;
+
+ val = readl(host->regs_va + FSMC_PC);
+ val &= ~FSMC_ENABLE;
+ writel(val, host->regs_va + FSMC_PC);
+}
+
/*
* fsmc_nand_probe - Probe function
* @pdev: platform device structure
@@ -1141,6 +1154,7 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
if (host->mode == USE_DMA_ACCESS)
dma_release_channel(host->read_dma_chan);
disable_clk:
+ fsmc_nand_disable(host);
clk_disable_unprepare(host->clk);
return ret;
@@ -1155,6 +1169,7 @@ static int fsmc_nand_remove(struct platform_device *pdev)
if (host) {
nand_release(&host->nand);
+ fsmc_nand_disable(host);
if (host->mode == USE_DMA_ACCESS) {
dma_release_channel(host->write_dma_chan);
--
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