linux-kernel - [PATCH] mtd: spi-nor: Support controllers with limited TX FIFO size

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Date:   Wed, 13 Jun 2018 11:38:12 +0530
From:   Yogesh Gaur <yogeshnarayan.gaur@....com>
To:     linux-mtd@...ts.infradead.org
Cc:     boris.brezillon@...tlin.com, frieder.schrempf@...eet.de,
        computersforpeace@...il.com, david.wolfe@....com, han.xu@....com,
        festevam@...il.com, marek.vasut@...il.com,
        prabhakar.kushwaha@....com, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Yogesh Gaur <yogeshnarayan.gaur@....com>
Subject: [PATCH] mtd: spi-nor: Support controllers with limited TX FIFO size

Some SPI controllers can't write nor->page_size bytes in a single
step because their TX FIFO is too small.

Allow nor->write() to return a size that is smaller than the requested
write size to gracefully handle this case.

Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@....com>
---
 drivers/mtd/spi-nor/spi-nor.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 5bfa36e..3e63543 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1431,13 +1431,6 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
 			goto write_err;
 		*retlen += written;
 		i += written;
-		if (written != page_remain) {
-			dev_err(nor->dev,
-				"While writing %zu bytes written %zd bytes\n",
-				page_remain, written);
-			ret = -EIO;
-			goto write_err;
-		}
 	}
 
 write_err:
-- 
2.7.4

Patch is based on the spi-mem framework[1]
[1]https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git/log/?h=for-4.18