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[209.85.220.41]) by mx.google.com with SMTPS id f20-20020adfc994000000b0021d6be62c2dsor799904wrh.53.2022.07.28.10.17.59 for (Google Transport Security); Thu, 28 Jul 2022 10:17:59 -0700 (PDT) Received-SPF: pass (google.com: domain of michael@amarulasolutions.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:adf:f911:0:b0:21e:c0f6:fd26 with SMTP id b17-20020adff911000000b0021ec0f6fd26mr6870960wrr.361.1659028678724; Thu, 28 Jul 2022 10:17:58 -0700 (PDT) Received: from panicking.amarulasolutions.com ([2.196.208.4]) by smtp.gmail.com with ESMTPSA id h3-20020a5d4fc3000000b0021eba590ad1sm1667850wrw.90.2022.07.28.10.17.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jul 2022 10:17:56 -0700 (PDT) From: Michael Trimarchi To: Dario Binacchi , u-boot@lists.denx.de Cc: linux-amarula@amarulasolutions.com, Tommaso Merciai Subject: [PATCH 4/5] mtd: nand: samsung: Retrieve ECC requirements from extended Date: Thu, 28 Jul 2022 19:17:42 +0200 Message-Id: <20220728171744.1761739-5-michael@amarulasolutions.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220728171744.1761739-1-michael@amarulasolutions.com> References: <20220728171744.1761739-1-michael@amarulasolutions.com> MIME-Version: 1.0 X-Original-Sender: michael@amarulasolutions.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@amarulasolutions.com header.s=google header.b=kber122+; spf=pass (google.com: domain of michael@amarulasolutions.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=michael@amarulasolutions.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=amarulasolutions.com Content-Type: text/plain; charset="UTF-8" Precedence: list Mailing-list: list linux-amarula@amarulasolutions.com; contact linux-amarula+owners@amarulasolutions.com List-ID: X-Spam-Checked-In-Group: linux-amarula@amarulasolutions.com X-Google-Group-Id: 476853432473 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Upstream linux commit 8fc82d456e40a0. On some nand controllers with hw-ecc the controller code wants to know the ecc strength and size and having these as 0, 0 is not accepted. Specifying these in devicetree is possible but undesirable as the nand may be different in different production runs of the same board, so it is better to get this info from the nand id where possible. This commit adds code to read the ecc strength and size from the nand for Samsung extended-id nands. This code is based on the info for the 5th id byte in the datasheets for the following Samsung nands: K9GAG08U0E, K9GAG08U0F, K9GAG08X0D, K9GBG08U0A, K9GBG08U0B. These all use these bits in the exact same way. Signed-off-by: Michael Trimarchi --- drivers/mtd/nand/raw/nand_samsung.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/mtd/nand/raw/nand_samsung.c b/drivers/mtd/nand/raw/nand_samsung.c index 0ab8062193..36ef48e5ec 100644 --- a/drivers/mtd/nand/raw/nand_samsung.c +++ b/drivers/mtd/nand/raw/nand_samsung.c @@ -64,6 +64,26 @@ static void samsung_nand_decode_id(struct nand_chip *chip) extid >>= 2; mtd->erasesize = (128 * 1024) << (((extid >> 1) & 0x04) | (extid & 0x03)); + + /* Extract ECC requirements from 5th id byte*/ + extid = (chip->id.data[4] >> 4) & 0x07; + if (extid < 5) { + chip->ecc_step_ds = 512; + chip->ecc_strength_ds = 1 << extid; + } else { + chip->ecc_step_ds = 1024; + switch (extid) { + case 5: + chip->ecc_strength_ds = 24; + break; + case 6: + chip->ecc_strength_ds = 40; + break; + case 7: + chip->ecc_strength_ds = 60; + break; + } + } } else { nand_decode_ext_id(chip); }