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Tue, 03 Oct 2023 11:46:26 -0700 (PDT) Subject: Re: [PATCH v2] mtd: rawnand: brcmnand: Initial exec_op implementation To: Miquel Raynal Cc: dregan@mail.com, bcm-kernel-feedback-list@broadcom.com, linux-mtd@lists.infradead.org, f.fainelli@gmail.com, rafal@milecki.pl, joel.peshkin@broadcom.com, computersforpeace@gmail.com, dan.beygelman@broadcom.com, frieder.schrempf@kontron.de, linux-kernel@vger.kernel.org, vigneshr@ti.com, richard@nod.at, bbrezillon@kernel.org, kdasu.kdev@gmail.com References: <20230922162424.4a7b27ec@xps-13> <20231002143527.4ccf254a@xps-13> <04350e70-6ef0-4998-664f-20b96b63b0f4@broadcom.com> <20231003112819.53707d54@xps-13> From: William Zhang Message-ID: <37416f2e-f150-cc8f-76bd-3d54f9e25d08@broadcom.com> Date: Tue, 3 Oct 2023 11:46:25 -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: <20231003112819.53707d54@xps-13> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231003_114629_739595_B95ADD54 X-CRM114-Status: GOOD ( 39.90 ) 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="===============8073249262270751895==" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org --===============8073249262270751895== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000f71c2d0606d44e1b" --000000000000f71c2d0606d44e1b Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Hi Miquel, On 10/03/2023 02:28 AM, Miquel Raynal wrote: > Hi William, > > william.zhang@broadcom.com wrote on Mon, 2 Oct 2023 12:57:01 -0700: > >> Hi Miquel, >> >> On 10/02/2023 05:35 AM, Miquel Raynal wrote: >>> Hi David, >>> >>> dregan@mail.com wrote on Sat, 30 Sep 2023 03:57:35 +0200: >>> >>>> Initial exec_op implementation for Broadcom STB, Broadband and iProc SoC >>>> This adds exec_op and removes the legacy interface. >>>> >>>> Signed-off-by: David Regan >>>> Reviewed-by: William Zhang >>>> >>>> --- >>>> >>> >>> ... >>> >>>> +static int brcmnand_parser_exec_matched_op(struct nand_chip *chip, >>>> + const struct nand_subop *subop) >>>> +{ >>>> + struct brcmnand_host *host = nand_get_controller_data(chip); >>>> + struct brcmnand_controller *ctrl = host->ctrl; >>>> + struct mtd_info *mtd = nand_to_mtd(chip); >>>> + const struct nand_op_instr *instr = &subop->instrs[0]; >>>> + unsigned int i; >>>> + int ret = 0; >>>> + >>>> + for (i = 0; i < subop->ninstrs; i++) { >>>> + instr = &subop->instrs[i]; >>>> + >>>> + if ((instr->type == NAND_OP_CMD_INSTR) && >>>> + (instr->ctx.cmd.opcode == NAND_CMD_STATUS)) >>>> + ctrl->status_cmd = 1; >>>> + else if (ctrl->status_cmd && (instr->type == NAND_OP_DATA_IN_INSTR)) { >>>> + /* >>>> + * need to fake the nand device write protect because nand_base does a >>>> + * nand_check_wp which calls nand_status_op NAND_CMD_STATUS which checks >>>> + * that the nand is not write protected before an operation starts. >>>> + * The problem with this is it's done outside exec_op so the nand is >>>> + * write protected and this check will fail until the write or erase >>>> + * or write back operation actually happens where we turn off wp. >>>> + */ >>>> + u8 *in; >>>> + >>>> + ctrl->status_cmd = 0; >>>> + >>>> + instr = &subop->instrs[i]; >>>> + in = instr->ctx.data.buf.in; >>>> + in[0] = brcmnand_status(host) | NAND_STATUS_WP; /* hide WP status */ >>> >>> I don't understand why you are faking the WP bit. If it's set, >>> brcmnand_status() should return it and you should not care about it. If >>> it's not however, can you please give me the path used when we have >>> this issue? Either we need to modify the core or we need to provide >>> additional helpers in this driver to circumvent the faulty path. >> >> The reason we have to hide wp status for status command is because >> nand_base calls nand_check_wp at the very beginning of write and erase >> function. This applies to both exec_op path and legacy path. With >> Broadcom nand controller and most of our board design using the WP pin >> and have it asserted by default, the nand_check_wp function will fail >> and write/erase aborts. This workaround has been there before this >> exec_op patch. >> >> I agree it is ugly and better to be addressed in the nand base code. And >> I understand Broadcom's WP approach may sound a bit over cautious but we >> want to make sure no spurious erase/write can happen under any >> circumstance except software explicitly want to write and erase. WP is >> standard nand chip pin and I think most the nand controller has that >> that pin in the design too but it is possible it is not used and >> bootloader can de-assert the pin and have a always-writable nand flash >> for linux. So maybe we can add nand controller dts option "nand-use-wp". >> If this property exist and set to 1, wp control is in use and nand >> driver need to control the pin on/ff as needed when doing write and >> erase function. Also nand base code should not call nand_check_wp when >> wp is in use. Then we can remove the faking WP status workaround. >> >>> >>>> + } else if (instr->type == NAND_OP_WAITRDY_INSTR) { >>>> + ret = bcmnand_ctrl_poll_status(host, NAND_CTRL_RDY, NAND_CTRL_RDY, 0); >>>> + if (ctrl->wp_cmd) { >>>> + ctrl->wp_cmd = 0; >>>> + brcmnand_wp(mtd, 1); >>> >>> This ideally should disappear. >>> >> Maybe we can have the destructive operation patch from Borris. >> Controller driver still need to assert/deassert the pin if it uses nand >> wp feature but at least it does not need to guess the op code. > > Ah, yeah, I get it. > > Please be my guest, you can revive this patch series (might need light > tweaking, nothing big) and also take inspiration from it if necessary: > https://github.com/bbrezillon/linux/commit/e612e1f2c69a33ac5f2c91d13669f0f172d58717 > https://github.com/bbrezillon/linux/commit/4ec6f8d8d83f5aaca5d1877f02d48da96d41fcba > https://github.com/bbrezillon/linux/commit/11b4acffd761c4928652d7028d19fcd6f45e4696 > Sure we will incorporate the destructive operation patch and provide a new revision. The WP status workaround will stay at least for this change. If you think my suggestion using a dts setting above is okay, we can provide a patch for that as well. Or if you have any other idea or suggestion, we'd like to hear too. > Thanks, > Miquèl > --000000000000f71c2d0606d44e1b Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQcAYJKoZIhvcNAQcCoIIQYTCCEF0CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3HMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e 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