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[81.204.249.205]) by smtp.gmail.com with ESMTPSA id e32-20020a5d5960000000b0031432f1528csm11637235wri.45.2023.07.10.05.42.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Jul 2023 05:42:41 -0700 (PDT) Message-ID: <0d6d0c57-c1e3-6761-9ecd-48176b4b6d4c@gmail.com> Date: Mon, 10 Jul 2023 14:42:40 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 From: Johan Jonker Subject: [PATCH v4 3/3] mtd: rawnand: rockchip: add skipbbt option To: miquel.raynal@bootlin.com Cc: richard@nod.at, vigneshr@ti.com, heiko@sntech.de, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, yifeng.zhao@rock-chips.com References: <08f694df-4c1d-f059-43fd-f1aee678062c@gmail.com> Content-Language: en-US In-Reply-To: <08f694df-4c1d-f059-43fd-f1aee678062c@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230710_054243_622772_4C310B95 X-CRM114-Status: GOOD ( 12.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Rockchip SoCs the first boot stages are written on NAND with help of manufacturer software that uses a different format then the MTD framework. Skip the automatic BBT scan with the NAND_SKIP_BBTSCAN option so that the original content is unchanged during the driver probe. The NAND_NO_BBM_QUIRK option allows us to erase bad blocks with the nand_erase_nand() function and the flash_erase command. With these options the user has the "freedom of choice" by neutral access mode to read and write in whatever format is needed. Signed-off-by: Johan Jonker --- Changed V4: Reduce subject size Changes V3: Change prefixes Changed V2: reword --- I'm aware that the maintainer finds it "awful", but it's absolute necessary to: 1: read/write boot blocks in user space without touching original content 2: format a NAND for MTD either with built in or external driver module So we keep it include in this serie. --- drivers/mtd/nand/raw/rockchip-nand-controller.c | 7 +++++++ 1 file changed, 7 insertions(+) -- 2.30.2 diff --git a/drivers/mtd/nand/raw/rockchip-nand-controller.c b/drivers/mtd/nand/raw/rockchip-nand-controller.c index 5a04680342c3..fcda4c760ffa 100644 --- a/drivers/mtd/nand/raw/rockchip-nand-controller.c +++ b/drivers/mtd/nand/raw/rockchip-nand-controller.c @@ -188,6 +188,10 @@ struct rk_nfc { unsigned long assigned_cs; }; +static int skipbbt; +module_param(skipbbt, int, 0644); +MODULE_PARM_DESC(skipbbt, "Skip BBT scan if data on the NAND chip is not in MTD format."); + static inline struct rk_nfc_nand_chip *rk_nfc_to_rknand(struct nand_chip *chip) { return container_of(chip, struct rk_nfc_nand_chip, chip); @@ -1153,6 +1157,9 @@ static int rk_nfc_nand_chip_init(struct device *dev, struct rk_nfc *nfc, nand_set_controller_data(chip, nfc); + if (skipbbt) + chip->options |= NAND_SKIP_BBTSCAN | NAND_NO_BBM_QUIRK; + chip->options |= NAND_USES_DMA | NAND_NO_SUBPAGE_WRITE; chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;