From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.free-electrons.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1eeePM-0002kF-6g for linux-mtd@lists.infradead.org; Thu, 25 Jan 2018 10:05:29 +0000 Date: Thu, 25 Jan 2018 11:05:01 +0100 From: Boris Brezillon To: Boris Brezillon , Richard Weinberger , linux-mtd@lists.infradead.org Cc: David Woodhouse , Brian Norris , Marek Vasut , Cyrille Pitchen , Han Xu , Miquel Raynal Subject: Re: [PATCH] mtd: nand: gpmi: Fix subpage reads Message-ID: <20180125110501.084c81dd@bbrezillon> In-Reply-To: <20180123101317.15925-1-boris.brezillon@free-electrons.com> References: <20180123101317.15925-1-boris.brezillon@free-electrons.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, 23 Jan 2018 11:13:17 +0100 Boris Brezillon wrote: > Commit 25f815f66a14 ("mtd: nand: force drivers to explicitly send > READ/PROG commands") added a call to nand_read_page_op() in > gpmi_ecc_read_page(), which means this function now sends a READ0 > command and place the data pointer at the beginning of the page. This > logic is breaking gpmi_ecc_read_subpage() which was calling > gpmi_ecc_read_page() and expected it to only retrieve the data without > sending the READ0 command. > > Create a gpmi_ecc_read_page_data() helper which only does the data > retrieval and ECC correction steps and implement gpmi_ecc_read_page() > as a wrapper that calls nand_read_page_op()+gpmi_ecc_read_page_data(). > > This way, gpmi_ecc_read_subpage() can call gpmi_ecc_read_page_data() > which restores the logic we had before commit 25f815f66a14 ("mtd: nand: > force drivers to explicitly send READ/PROG commands"). > Applied. > Fixes: 25f815f66a14 ("mtd: nand: force drivers to explicitly send READ/PROG commands") > Signed-off-by: Boris Brezillon > --- > drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 18 +++++++++++++----- > 1 file changed, 13 insertions(+), 5 deletions(-) > > diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > index 3198f5f79a82..93f212457d4d 100644 > --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > @@ -1029,11 +1029,13 @@ static void block_mark_swapping(struct gpmi_nand_data *this, > p[1] = (p[1] & mask) | (from_oob >> (8 - bit)); > } > > -static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip, > - uint8_t *buf, int oob_required, int page) > +static int gpmi_ecc_read_page_data(struct nand_chip *chip, > + uint8_t *buf, int oob_required, > + int page) > { > struct gpmi_nand_data *this = nand_get_controller_data(chip); > struct bch_geometry *nfc_geo = &this->bch_geometry; > + struct mtd_info *mtd = nand_to_mtd(chip); > void *payload_virt; > dma_addr_t payload_phys; > void *auxiliary_virt; > @@ -1043,8 +1045,6 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip, > unsigned int max_bitflips = 0; > int ret; > > - nand_read_page_op(chip, page, 0, NULL, 0); > - > dev_dbg(this->dev, "page number is : %d\n", page); > ret = read_page_prepare(this, buf, nfc_geo->payload_size, > this->payload_virt, this->payload_phys, > @@ -1178,6 +1178,14 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip, > return max_bitflips; > } > > +static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip, > + uint8_t *buf, int oob_required, int page) > +{ > + nand_read_page_op(chip, page, 0, NULL, 0); > + > + return gpmi_ecc_read_page_data(chip, buf, oob_required, page); > +} > + > /* Fake a virtual small page for the subpage read */ > static int gpmi_ecc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip, > uint32_t offs, uint32_t len, uint8_t *buf, int page) > @@ -1257,7 +1265,7 @@ static int gpmi_ecc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip, > > /* Read the subpage now */ > this->swap_block_mark = false; > - max_bitflips = gpmi_ecc_read_page(mtd, chip, buf, 0, page); > + max_bitflips = gpmi_ecc_read_page_data(chip, buf, 0, page); > > /* Restore */ > writel(r1_old, bch_regs + HW_BCH_FLASH0LAYOUT0);