[PATCH] [MTD] MXC NAND driver fixes

[Sascha Hauer]

Hi,

On Fri, Apr 03, 2009 at 01:54:20AM +0400, Vladimir Barinov wrote:
> The following patch fixes:
>  - re-initialization of host->col_addr which is used as byte index
>    between the successive READID flash commands.
>  - compile error when CONFIG_PM is enabled
>  - pass on the error code from clk_get()
>  - return -ENOMEM in case of failed ioremap()
>  - pass on the return value of platform_driver_probe() instead of inventing -ENODEV
>  - let command line partition table parsing with mxc_nand name.
>    The cmd_line parsing is done via <mtd-id> name that differs
>    from mxc_nand by default and looks like "NAND 256MiB 1,8V 8-bit"
> 
> Signed-off-by: Vladimir Barinov <vbarinov at embeddedalley.com>
> Signed-off-by: Lothar Wassmann <LW at KARO-electronics.de>
> ---
>  drivers/mtd/nand/mxc_nand.c |   47 +++++++++++++++++++++++++++---------------
>  1 files changed, 30 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
> index bad048a..e94c956 100644
> --- a/drivers/mtd/nand/mxc_nand.c
> +++ b/drivers/mtd/nand/mxc_nand.c
> @@ -831,6 +831,7 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
>  		break;
>  
>  	case NAND_CMD_READID:
> +		host->col_addr = 0;
>  		send_read_id(host);
>  		break;
>  
> @@ -881,8 +882,10 @@ static int __init mxcnd_probe(struct platform_device *pdev)
>  	this->verify_buf = mxc_nand_verify_buf;
>  
>  	host->clk = clk_get(&pdev->dev, "nfc");
> -	if (IS_ERR(host->clk))
> +	if (IS_ERR(host->clk)) {
> +		err = PTR_ERR(host->clk);
>  		goto eclk;
> +	}
>  
>  	clk_enable(host->clk);
>  	host->clk_act = 1;
> @@ -895,7 +898,7 @@ static int __init mxcnd_probe(struct platform_device *pdev)
>  
>  	host->regs = ioremap(res->start, res->end - res->start + 1);
>  	if (!host->regs) {
> -		err = -EIO;
> +		err = -ENOMEM;
>  		goto eres;
>  	}
>  
> @@ -964,6 +967,9 @@ static int __init mxcnd_probe(struct platform_device *pdev)
>  
>  	/* Register the partitions */
>  #ifdef CONFIG_MTD_PARTITIONS
> +#ifdef CONFIG_MTD_CMDLINE_PARTS
> +	mtd->name = "mxc_nand";
> +#endif

Do we need an ifdef here?

>  	nr_parts =
>  	    parse_mtd_partitions(mtd, part_probes, &host->parts, 0);
>  	if (nr_parts > 0)
> @@ -1010,30 +1016,35 @@ static int __devexit mxcnd_remove(struct platform_device *pdev)
>  #ifdef CONFIG_PM
>  static int mxcnd_suspend(struct platform_device *pdev, pm_message_t state)
>  {
> -	struct mtd_info *info = platform_get_drvdata(pdev);
> +	struct mtd_info *mtd = platform_get_drvdata(pdev);
> +	struct nand_chip *nand_chip = mtd->priv;
> +	struct mxc_nand_host *host = nand_chip->priv;
>  	int ret = 0;
>  
>  	DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND suspend\n");
> -	if (info)
> -		ret = info->suspend(info);
> -
> -	/* Disable the NFC clock */
> -	clk_disable(nfc_clk);	/* FIXME */
> +	if (mtd) {
> +		ret = mtd->suspend(mtd);
> +		/* Disable the NFC clock */
> +		clk_disable(host->clk);
> +	}
>  
>  	return ret;
>  }
>  
>  static int mxcnd_resume(struct platform_device *pdev)
>  {
> -	struct mtd_info *info = platform_get_drvdata(pdev);
> +	struct mtd_info *mtd = platform_get_drvdata(pdev);
> +	struct nand_chip *nand_chip = mtd->priv;
> +	struct mxc_nand_host *host = nand_chip->priv;
>  	int ret = 0;
>  
>  	DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND resume\n");
> -	/* Enable the NFC clock */
> -	clk_enable(nfc_clk);	/* FIXME */
>  
> -	if (info)
> -		info->resume(info);
> +	if (mtd) {
> +		/* Enable the NFC clock */
> +		clk_enable(host->clk);
> +		mtd->resume(mtd);
> +	}
>  
>  	return ret;
>  }
> @@ -1054,13 +1065,15 @@ static struct platform_driver mxcnd_driver = {
>  
>  static int __init mxc_nd_init(void)
>  {
> +	int ret;
> +
>  	/* Register the device driver structure. */
>  	pr_info("MXC MTD nand Driver\n");
> -	if (platform_driver_probe(&mxcnd_driver, mxcnd_probe) != 0) {
> +	ret = platform_driver_probe(&mxcnd_driver, mxcnd_probe);
> +	if (ret)
>  		printk(KERN_ERR "Driver register failed for mxcnd_driver\n");

Can you please also remove this printk? platform_driver_probe()
fails when no platform device is registered for this driver which
only means that a particular board does not have NAND support. Getting
an error here is quite confusing in this situation.

Sascha

> -		return -ENODEV;
> -	}
> -	return 0;
> +
> +	return ret;
>  }
>  
>  static void __exit mxc_nd_cleanup(void)
> -- 
> 1.5.6
> 
> 

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