linux-kernel - [PATCH 3/4] mtd: rawnand: fsmc: Take instruction delay into account

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Date:   Fri, 12 Nov 2021 15:38:54 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Herve Codina <herve.codina@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: [PATCH 3/4] mtd: rawnand: fsmc: Take instruction delay into account

The FSMC nand controller should apply a delay after the
instruction has been issued on the bus.
The FSMC nand controller driver did not handle this delay.

This patch adds this waiting delay in the FSMC nand
controller driver.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 drivers/mtd/nand/raw/fsmc_nand.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/nand/raw/fsmc_nand.c b/drivers/mtd/nand/raw/fsmc_nand.c
index 7f057cfee6c4..bff09219ce3a 100644
--- a/drivers/mtd/nand/raw/fsmc_nand.c
+++ b/drivers/mtd/nand/raw/fsmc_nand.c
@@ -15,6 +15,7 @@
 
 #include <linux/clk.h>
 #include <linux/completion.h>
+#include <linux/delay.h>
 #include <linux/dmaengine.h>
 #include <linux/dma-direction.h>
 #include <linux/dma-mapping.h>
@@ -667,6 +668,9 @@ static int fsmc_exec_op(struct nand_chip *chip, const struct nand_operation *op,
 						instr->ctx.waitrdy.timeout_ms);
 			break;
 		}
+
+		if (instr->delay_ns)
+			ndelay(instr->delay_ns);
 	}
 
 	return ret;
-- 
2.31.1