From: sshtylyov@mvista•com (Sergei Shtylyov)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH V7 1/4] MTD: pxa3xx_nand: enhance suspend and resume routine
Date: Wed, 13 Jul 2011 14:53:17 +0400 [thread overview]
Message-ID: <4E1D791D.2060801@mvista.com> (raw)
In-Reply-To: <1310481336-13230-2-git-send-email-leiwen@marvell.com>
Hello.
On 12-07-2011 18:35, Lei Wen wrote:
> This patch add protection on the suspend&resume path to prevent
> some unexpected behavior, like interrupt occur at the very second
> of resume back and it don't follow normal command path, which lead
> to bug.
> Signed-off-by: Lei Wen<leiwen@marvell•com>
> ---
> drivers/mtd/nand/pxa3xx_nand.c | 17 ++++++++++++++++-
> 1 files changed, 16 insertions(+), 1 deletions(-)
> diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
> index b7db1b2..1efecf7 100644
> --- a/drivers/mtd/nand/pxa3xx_nand.c
> +++ b/drivers/mtd/nand/pxa3xx_nand.c
> @@ -1158,23 +1158,38 @@ static int pxa3xx_nand_probe(struct platform_device *pdev)
> static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
> {
> struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
> + struct mtd_info *mtd;
>
> if (info->state) {
> dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
> return -EAGAIN;
> }
>
> + mtd = info->mtd;
Why not make this into an initializer?
> + mtd->suspend(mtd);
> return 0;
> }
>
> static int pxa3xx_nand_resume(struct platform_device *pdev)
> {
> struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
> + struct mtd_info *mtd;
> +
> + /* We don't want to handle interrupt without calling mtd routine */
> + disable_int(info, NDCR_INT_MASK);
>
> nand_writel(info, NDTR0CS0, info->ndtr0cs0);
> nand_writel(info, NDTR1CS0, info->ndtr1cs0);
> - clk_enable(info->clk);
>
> + /*
> + * As the spec, the NDSR would be updated to 0x1800 when
As the spec says?
> + * do the nand_clk disable/enable.
Doing.
> + * To prevent it damage state machine of the driver, clear
From damaging?
> + * all status before resume
> + */
> + nand_writel(info, NDSR, NDSR_MASK);
> + mtd = info->mtd;
This one too could be an initializer...
> + mtd->resume(mtd);
> return 0;
> }
> #else
WBR, Sergei
next prev parent reply other threads:[~2011-07-13 10:53 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-08 16:00 [PATCH] MTD: pxa3xx_nand: enable multiple chip select support Lei Wen
2011-06-22 11:39 ` Daniel Mack
2011-07-08 17:38 ` Lei Wen
2011-06-22 13:06 ` Daniel Mack
2011-06-23 6:22 ` Lei Wen
2011-07-08 16:09 ` Igor Grinberg
2011-07-08 15:26 ` Lei Wen
2011-06-23 10:44 ` Igor Grinberg
2011-06-25 11:17 ` Lei Wen
2011-06-25 12:32 ` Daniel Mack
2011-06-25 12:51 ` Lei Wen
2011-06-27 13:22 ` Igor Grinberg
2011-06-28 7:32 ` Artem Bityutskiy
2011-06-28 15:12 ` Lei Wen
2011-06-29 3:51 ` [PATCH V3 0/9] pxa3xx_nand: add two " Lei Wen
2011-06-29 9:00 ` Igor Grinberg
2011-06-29 10:20 ` Artem Bityutskiy
2011-07-04 9:27 ` Lei Wen
2011-07-04 9:25 ` [PATCH V4 0/4] " Lei Wen
2011-07-08 3:34 ` [PATCH V5 0/3] " Lei Wen
2011-07-12 10:28 ` [PATCH V6 0/4] " Lei Wen
2011-07-12 14:35 ` [PATCH V7 " Lei Wen
2011-07-15 3:44 ` [PATCH V8 " Lei Wen
2011-07-20 4:51 ` Artem Bityutskiy
2011-07-15 3:44 ` [PATCH V8 1/4] MTD: pxa3xx_nand: enhance suspend and resume routine Lei Wen
2011-07-15 3:44 ` [PATCH V8 2/4] MTD: pxa3xx_nand: convert all printk into dev_* Lei Wen
2011-07-15 3:44 ` [PATCH V8 3/4] MTD: pxa3xx_nand: sperate each chip individual info Lei Wen
2011-07-15 3:44 ` [PATCH V8 4/4] MTD: pxa3xx_nand: enable multiple chip select support Lei Wen
2011-07-12 14:35 ` [PATCH V7 1/4] MTD: pxa3xx_nand: enhance suspend and resume routine Lei Wen
2011-07-13 10:53 ` Sergei Shtylyov [this message]
2011-07-12 14:35 ` [PATCH V7 2/4] MTD: pxa3xx_nand: convert all printk into dev_* Lei Wen
2011-07-13 10:57 ` Sergei Shtylyov
2011-07-13 12:41 ` Lei Wen
2011-07-13 14:35 ` Sergei Shtylyov
2011-07-12 14:35 ` [PATCH V7 3/4] MTD: pxa3xx_nand: sperate each chip individual info Lei Wen
2011-07-12 14:35 ` [PATCH V7 4/4] MTD: pxa3xx_nand: enable multiple chip select support Lei Wen
2011-07-12 10:28 ` [PATCH V6 1/4] MTD: pxa3xx_nand: convert all printk into dev_* Lei Wen
2011-07-12 10:28 ` [PATCH V6 2/4] MTD: pxa3xx_nand: sperate each chip individual info Lei Wen
2011-07-12 10:28 ` [PATCH V6 3/4] MTD: pxa3xx_nand: enable multiple chip select support Lei Wen
2011-07-12 10:28 ` [PATCH V6 4/4] MTD: pxa3xx_nand: enhance suspend and resume routine Lei Wen
2011-07-12 11:39 ` Daniel Mack
2011-07-12 12:02 ` Daniel Mack
2011-07-12 15:56 ` Igor Grinberg
2011-07-12 17:35 ` Daniel Mack
2011-07-08 3:34 ` [PATCH 1/3] MTD: pxa3xx_nand: convert all printk into dev_* Lei Wen
2011-07-08 3:34 ` [PATCH 2/3] MTD: pxa3xx_nand: sperate each chip individual info Lei Wen
2011-07-08 3:34 ` [PATCH 3/3] MTD: pxa3xx_nand: enable multiple chip select support Lei Wen
2011-07-04 9:25 ` [PATCH 1/4] MTD: pxa3xx_nand: convert all printk into dev_* Lei Wen
2011-07-04 9:25 ` [PATCH 2/4] MTD: pxa3xx_nand: sperate each chip individual info Lei Wen
2011-07-06 7:29 ` Igor Grinberg
2011-07-04 9:25 ` [PATCH 3/4] MTD: pxa3xx_nand: enable multiple chip select support Lei Wen
2011-07-06 6:53 ` Artem Bityutskiy
2011-07-06 6:54 ` Lei Wen
2011-07-06 7:07 ` Artem Bityutskiy
2011-07-06 7:41 ` Igor Grinberg
2011-07-07 6:26 ` Lei Wen
2011-07-07 8:59 ` Igor Grinberg
2011-07-07 9:06 ` Lei Wen
2011-07-07 11:23 ` Igor Grinberg
2011-07-11 14:49 ` Daniel Mack
2011-07-11 18:19 ` Igor Grinberg
2011-07-11 18:53 ` Daniel Mack
2011-07-11 19:25 ` Igor Grinberg
2011-07-12 9:40 ` Lei Wen
2011-07-12 9:57 ` Daniel Mack
2011-07-12 10:29 ` Lei Wen
2011-07-12 12:05 ` Daniel Mack
2011-07-12 12:48 ` Daniel Mack
2011-07-12 15:49 ` Igor Grinberg
2011-07-04 9:25 ` [PATCH 4/4] ARM: mmp/pxa: fix nand platform data Lei Wen
2011-06-29 3:51 ` [PATCH 1/9] MTD: pxa3xx_nand: convert all printk into dev_* Lei Wen
2011-06-29 3:51 ` [PATCH 2/9] MTD: pxa3xx_nand: enable multiple chip select support Lei Wen
2011-06-29 7:11 ` Artem Bityutskiy
2011-06-29 7:16 ` Lei Wen
2011-06-29 3:51 ` [PATCH 3/9] ARM: aspenite: fix nand platform data Lei Wen
2011-06-29 3:51 ` [PATCH 4/9] ARM: cm-x300: " Lei Wen
2011-06-29 3:51 ` [PATCH 5/9] ARM: colibri-pxa3xx: " Lei Wen
2011-06-29 3:51 ` [PATCH 6/9] ARM: littleton: " Lei Wen
2011-06-29 3:51 ` [PATCH 7/9] ARM: mxm8x10: " Lei Wen
2011-06-29 3:51 ` [PATCH 8/9] ARM: raumfeld: " Lei Wen
2011-06-29 3:51 ` [PATCH 9/9] ARM: zylonite: " Lei Wen
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