* Re: [PATCH] mtd: rawnand: fsl_ifc: Fix nand waitfunc return value
2018-03-19 22:05 [PATCH] mtd: rawnand: fsl_ifc: Fix nand waitfunc return value Jagdish Gediya
@ 2018-03-19 11:08 ` Boris Brezillon
0 siblings, 0 replies; 2+ messages in thread
From: Boris Brezillon @ 2018-03-19 11:08 UTC (permalink / raw)
To: Jagdish Gediya
Cc: linux-mtd, oss, boris.brezillon, computersforpeace, leoyang.li, stable
On Tue, 20 Mar 2018 03:35:12 +0530
Jagdish Gediya <jagdish.gediya@nxp.com> wrote:
> As per the IFC hardware manual, Most significant 2 bytes in
> nand_fsr register are the outcome of NAND READ STATUS command.
>
> So status value need to be shifted and aligned as per the nand
> framework requirement.
>
> Cc: stable@vger.kernel.org
Fixes tag please.
> Signed-off-by: Jagdish Gediya <jagdish.gediya@nxp.com>
> Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
> ---
> drivers/mtd/nand/fsl_ifc_nand.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
> index d9ce398..951dd89 100644
> --- a/drivers/mtd/nand/fsl_ifc_nand.c
> +++ b/drivers/mtd/nand/fsl_ifc_nand.c
> @@ -643,12 +643,13 @@ static int fsl_ifc_wait(struct mtd_info *mtd, struct nand_chip *chip)
> fsl_ifc_run_command(mtd);
>
> nand_fsr = ifc_in32(&ifc->ifc_nand.nand_fsr);
> -
> + nand_fsr >>= 16;
> + nand_fsr = (nand_fsr >> 8) | (nand_fsr << 8);
> /*
> * The chip always seems to report that it is
> * write-protected, even when it is not.
> */
> - return nand_fsr | NAND_STATUS_WP;
> + return (nand_fsr & 0xff) | NAND_STATUS_WP;
> }
>
> /*
--
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH] mtd: rawnand: fsl_ifc: Fix nand waitfunc return value
@ 2018-03-19 22:05 Jagdish Gediya
2018-03-19 11:08 ` Boris Brezillon
0 siblings, 1 reply; 2+ messages in thread
From: Jagdish Gediya @ 2018-03-19 22:05 UTC (permalink / raw)
To: linux-mtd
Cc: oss, boris.brezillon, computersforpeace, leoyang.li,
Jagdish Gediya, stable
As per the IFC hardware manual, Most significant 2 bytes in
nand_fsr register are the outcome of NAND READ STATUS command.
So status value need to be shifted and aligned as per the nand
framework requirement.
Cc: stable@vger.kernel.org
Signed-off-by: Jagdish Gediya <jagdish.gediya@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
---
drivers/mtd/nand/fsl_ifc_nand.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index d9ce398..951dd89 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -643,12 +643,13 @@ static int fsl_ifc_wait(struct mtd_info *mtd, struct nand_chip *chip)
fsl_ifc_run_command(mtd);
nand_fsr = ifc_in32(&ifc->ifc_nand.nand_fsr);
-
+ nand_fsr >>= 16;
+ nand_fsr = (nand_fsr >> 8) | (nand_fsr << 8);
/*
* The chip always seems to report that it is
* write-protected, even when it is not.
*/
- return nand_fsr | NAND_STATUS_WP;
+ return (nand_fsr & 0xff) | NAND_STATUS_WP;
}
/*
--
1.9.1
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2018-03-19 11:08 ` Boris Brezillon
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