linux-kernel - [PATCH v2 3/4] mtd: rawnand: fsmc: Take instruction delay into account

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Date:   Fri, 19 Nov 2021 08:39:08 +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 v2 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.

Add this waiting delay in the FSMC NAND controller driver.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
Changes v1 -> v2:
- Commit log reword

 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 658f0cbe7ce8..0a6c9ef0ea8b 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>
@@ -664,6 +665,9 @@ 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