linux-kernel - Re: [PATCH v7] MTD: LPC32xx SLC NAND driver

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Date:	Wed, 27 Jun 2012 13:46:47 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Roland Stigge <stigge@...com.de>
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	dwmw2@...radead.org, kevin.wells@....com, srinivas.bakki@....com,
	linux-arm-kernel@...ts.infradead.org, hechtb@...glemail.com,
	lars@...afoo.de, b32955@...escale.com, leiwen@...vell.com,
	linux@....linux.org.uk
Subject: Re: [PATCH v7] MTD: LPC32xx SLC NAND driver

On Thu, 2012-06-07 at 12:22 +0200, Roland Stigge wrote:
> This patch adds support for the SLC NAND controller inside the LPC32xx SoC.
> 
> Signed-off-by: Roland Stigge <stigge@...com.de>

Now the write_page and write_page_raw functions return an error code,
see this commit in the l2 tree:

http://git.infradead.org/users/dedekind/l2-mtd.git/commit/49c8d9ab3b70732665249f2d993f734378ebbba9

I've amended your SLC driver, see below the diff. But I think it could
return the real return code becuse it can fail - could you please take a
look and send an incremental patch?

Please, base your work on top of the l2-mtd tree:
git://git.infradead.org/users/dedekind/l2-mtd.git

Thanks!

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 796e37b..7e2e78d 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -673,9 +673,9 @@ static int lpc32xx_nand_read_page_raw_syndrome(struct mtd_info *mtd,
  * Write the data and OOB data to the device, use ECC with the data,
  * disable ECC for the OOB data
  */
-static void lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
-                                            struct nand_chip *chip,
-                                            const u8 *buf, int oob_required)
+static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
+                                           struct nand_chip *chip,
+                                           const u8 *buf, int oob_required)
 {
        struct lpc32xx_nand_host *host = chip->priv;
        u8 *pb = chip->oob_poi + chip->ecc.layout->eccpos[0];
@@ -691,20 +691,22 @@ static void lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 
        /* Write ECC data to device */
        chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+       return 0;
 }
 
 /*
  * Write the data and OOB data to the device, no ECC correction with the
  * data or OOB data
  */
-static void lpc32xx_nand_write_page_raw_syndrome(struct mtd_info *mtd,
-                                                struct nand_chip *chip,
-                                                const u8 *buf,
-                                                int oob_required)
+static int lpc32xx_nand_write_page_raw_syndrome(struct mtd_info *mtd,
+                                               struct nand_chip *chip,
+                                               const u8 *buf,
+                                               int oob_required)
 {
        /* Raw writes can just use the FIFO interface */
        chip->write_buf(mtd, buf, chip->ecc.size * chip->ecc.steps);
        chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+       return 0;
 }
 
 static bool lpc32xx_dma_filter(struct dma_chan *chan, void *param)


-- 
Best Regards,
Artem Bityutskiy

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