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| Started by | Brian Norris <computersforpeace@gmail.com> |
|---|---|
| First post | 2015-10-01 19:20 +0200 |
| Last post | 2015-10-01 20:20 +0200 |
| Articles | 2 — 2 participants |
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Re: [PATCH] mtd: nand: pass page number to ecc->write_xxx() methods Brian Norris <computersforpeace@gmail.com> - 2015-10-01 19:20 +0200
Re: [PATCH] mtd: nand: pass page number to ecc->write_xxx() methods Boris Brezillon <boris.brezillon@free-electrons.com> - 2015-10-01 20:20 +0200
| From | Brian Norris <computersforpeace@gmail.com> |
|---|---|
| Date | 2015-10-01 19:20 +0200 |
| Subject | Re: [PATCH] mtd: nand: pass page number to ecc->write_xxx() methods |
| Message-ID | <qePGp-2Bk-9@gated-at.bofh.it> |
On Mon, Aug 24, 2015 at 07:10:19PM +0200, Boris Brezillon wrote: > The ->read_xxx() methods are all passed the page number the NAND controller > is supposed to read, but ->write_xxx() do not have such a parameter. > > This is a problem if we want to properly implement data > scrambling/randomization in order to mitigate MLC sensibility to repeated > pattern: to prevent bitflips in adjacent pages in the same block we need > to avoid repeating the same pattern at the same offset in those pages, > hence the randomizer/scrambler engine need to be passed the page value > in order to adapt its seed accordingly. > > Moreover, adding the page parameter the ->write_xxx() methods add some > consistency to the current model. > > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> > CC: Josh Wu <josh.wu@atmel.com> > CC: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> > CC: Maxime Ripard <maxime.ripard@free-electrons.com> > CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > CC: Huang Shijie <shijie.huang@intel.com> > CC: Bryan Wu <bryan.wu@analog.com> > CC: devel@driverdev.osuosl.org > CC: linux-arm-kernel@lists.infradead.org > CC: linux-kernel@vger.kernel.org > > --- > drivers/mtd/nand/atmel_nand.c | 6 ++++-- > drivers/mtd/nand/bf5xx_nand.c | 3 ++- > drivers/mtd/nand/brcmnand/brcmnand.c | 4 ++-- > drivers/mtd/nand/cafe_nand.c | 3 ++- > drivers/mtd/nand/denali.c | 5 +++-- > drivers/mtd/nand/docg4.c | 4 ++-- > drivers/mtd/nand/fsl_elbc_nand.c | 4 ++-- > drivers/mtd/nand/fsl_ifc_nand.c | 2 +- > drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 6 +++--- > drivers/mtd/nand/hisi504_nand.c | 3 ++- > drivers/mtd/nand/lpc32xx_mlc.c | 3 ++- > drivers/mtd/nand/lpc32xx_slc.c | 5 +++-- > drivers/mtd/nand/nand_base.c | 31 ++++++++++++++++++--------- > drivers/mtd/nand/omap2.c | 3 ++- > drivers/mtd/nand/pxa3xx_nand.c | 3 ++- > drivers/mtd/nand/sh_flctl.c | 3 ++- > drivers/mtd/nand/sunxi_nand.c | 5 +++-- > drivers/staging/mt29f_spinand/mt29f_spinand.c | 3 ++- > include/linux/mtd/nand.h | 6 +++--- > 19 files changed, 63 insertions(+), 39 deletions(-) Tip for rebasing -- I noticed one build failure for docg4: drivers/mtd/nand/docg4.c: In function ‘docg4_block_markbad’: drivers/mtd/nand/docg4.c:1116:2: error: too few arguments to function ‘docg4_write_page’ drivers/mtd/nand/docg4.c:985:12: note: declared here Brian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Boris Brezillon <boris.brezillon@free-electrons.com> |
|---|---|
| Date | 2015-10-01 20:20 +0200 |
| Message-ID | <qeQCt-3Wq-13@gated-at.bofh.it> |
| In reply to | #1237579 |
On Thu, 1 Oct 2015 10:17:50 -0700 Brian Norris <computersforpeace@gmail.com> wrote: > On Mon, Aug 24, 2015 at 07:10:19PM +0200, Boris Brezillon wrote: > > The ->read_xxx() methods are all passed the page number the NAND controller > > is supposed to read, but ->write_xxx() do not have such a parameter. > > > > This is a problem if we want to properly implement data > > scrambling/randomization in order to mitigate MLC sensibility to repeated > > pattern: to prevent bitflips in adjacent pages in the same block we need > > to avoid repeating the same pattern at the same offset in those pages, > > hence the randomizer/scrambler engine need to be passed the page value > > in order to adapt its seed accordingly. > > > > Moreover, adding the page parameter the ->write_xxx() methods add some > > consistency to the current model. > > > > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> > > CC: Josh Wu <josh.wu@atmel.com> > > CC: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> > > CC: Maxime Ripard <maxime.ripard@free-electrons.com> > > CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > CC: Huang Shijie <shijie.huang@intel.com> > > CC: Bryan Wu <bryan.wu@analog.com> > > CC: devel@driverdev.osuosl.org > > CC: linux-arm-kernel@lists.infradead.org > > CC: linux-kernel@vger.kernel.org > > > > --- > > drivers/mtd/nand/atmel_nand.c | 6 ++++-- > > drivers/mtd/nand/bf5xx_nand.c | 3 ++- > > drivers/mtd/nand/brcmnand/brcmnand.c | 4 ++-- > > drivers/mtd/nand/cafe_nand.c | 3 ++- > > drivers/mtd/nand/denali.c | 5 +++-- > > drivers/mtd/nand/docg4.c | 4 ++-- > > drivers/mtd/nand/fsl_elbc_nand.c | 4 ++-- > > drivers/mtd/nand/fsl_ifc_nand.c | 2 +- > > drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 6 +++--- > > drivers/mtd/nand/hisi504_nand.c | 3 ++- > > drivers/mtd/nand/lpc32xx_mlc.c | 3 ++- > > drivers/mtd/nand/lpc32xx_slc.c | 5 +++-- > > drivers/mtd/nand/nand_base.c | 31 ++++++++++++++++++--------- > > drivers/mtd/nand/omap2.c | 3 ++- > > drivers/mtd/nand/pxa3xx_nand.c | 3 ++- > > drivers/mtd/nand/sh_flctl.c | 3 ++- > > drivers/mtd/nand/sunxi_nand.c | 5 +++-- > > drivers/staging/mt29f_spinand/mt29f_spinand.c | 3 ++- > > include/linux/mtd/nand.h | 6 +++--- > > 19 files changed, 63 insertions(+), 39 deletions(-) > > Tip for rebasing -- I noticed one build failure for docg4: > > drivers/mtd/nand/docg4.c: In function ‘docg4_block_markbad’: > drivers/mtd/nand/docg4.c:1116:2: error: too few arguments to function ‘docg4_write_page’ > drivers/mtd/nand/docg4.c:985:12: note: declared here Fixed in v2, thanks for the pointer. -- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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