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Tue, 04 Jul 2023 17:50:30 -0700 (PDT) Subject: Re: [PATCH v3 5/5] mtd: rawnand: brcmnand: Fix mtd oobsize To: Miquel Raynal Cc: Broadcom Kernel List , Linux MTD List , f.fainelli@gmail.com, rafal@milecki.pl, kursad.oney@broadcom.com, joel.peshkin@broadcom.com, computersforpeace@gmail.com, anand.gore@broadcom.com, dregan@mail.com, kamal.dasu@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, Frieder Schrempf , linux-kernel@vger.kernel.org, Vignesh Raghavendra , Richard Weinberger , Boris Brezillon , Kamal Dasu References: <20230627193738.19596-1-william.zhang@broadcom.com> <20230627193738.19596-6-william.zhang@broadcom.com> <20230704173047.395e445e@xps-13> From: William Zhang Message-ID: Date: Tue, 4 Jul 2023 17:50:28 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20230704173047.395e445e@xps-13> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230704_175033_923950_650AB95D X-CRM114-Status: GOOD ( 26.98 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0078054197949776946==" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org --===============0078054197949776946== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000006b138c05ffb2c96f" --0000000000006b138c05ffb2c96f Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Hi Miquel, On 07/04/2023 08:30 AM, Miquel Raynal wrote: > Hi William, > > william.zhang@broadcom.com wrote on Tue, 27 Jun 2023 12:37:38 -0700: > >> brcmnand controller can only access the flash spare area up to certain >> bytes based on the ECC level. It can be less than the actual flash spare >> area size. For example, for many NAND chip supporting ECC BCH-8, it has >> 226 bytes spare area. But controller can only uses 218 bytes. So brcmand >> driver overrides the mtd oobsize with the controller's accessible spare >> area size. When the nand base driver utilizes the nand_device object, it >> resets the oobsize back to the actual flash spare aprea size from >> nand_memory_organization structure and controller may not able to access >> all the oob area as mtd advises. >> >> This change fixes the issue by overriding the oobsize in the >> nand_memory_organization structure to the controller's accessible spare >> area size. > > I am clearly not a big fan of this solution. memorg should be and > remain a read only object. Can you please find another solution? > I was debating on this too but I don't see option because there is no other hooks after nanddev_init to set the mtd->oobsize as far as I can see and I see there were similar fixes for other controller drivers after the nand device object init was committed, for example: Fixes: 629a442cad5f ("mtd: rawnand: Fill memorg during detection") I will think through this again but I am open to any suggestion. >> >> Fixes: a7ab085d7c16 ("mtd: rawnand: Initialize the nand_device object") >> Signed-off-by: William Zhang >> >> --- >> >> Changes in v3: None >> Changes in v2: None >> >> drivers/mtd/nand/raw/brcmnand/brcmnand.c | 7 +++++-- >> 1 file changed, 5 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> index 407bf79cbaf4..39c7f547db1f 100644 >> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> @@ -2647,6 +2647,8 @@ static int brcmnand_setup_dev(struct brcmnand_host *host) >> struct nand_chip *chip = &host->chip; >> const struct nand_ecc_props *requirements = >> nanddev_get_ecc_requirements(&chip->base); >> + struct nand_memory_organization *memorg = >> + nanddev_get_memorg(&chip->base); >> struct brcmnand_controller *ctrl = host->ctrl; >> struct brcmnand_cfg *cfg = &host->hwcfg; >> char msg[128]; >> @@ -2668,10 +2670,11 @@ static int brcmnand_setup_dev(struct brcmnand_host *host) >> if (cfg->spare_area_size > ctrl->max_oob) >> cfg->spare_area_size = ctrl->max_oob; >> /* >> - * Set oobsize to be consistent with controller's spare_area_size, as >> - * the rest is inaccessible. >> + * Set mtd and memorg oobsize to be consistent with controller's >> + * spare_area_size, as the rest is inaccessible. >> */ >> mtd->oobsize = cfg->spare_area_size * (mtd->writesize >> FC_SHIFT); >> + memorg->oobsize = mtd->oobsize; >> >> cfg->device_size = mtd->size; >> cfg->block_size = mtd->erasesize; > > > Thanks, > Miquèl > 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