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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYAQB-0006ii-Dq; Mon, 11 May 2020 15:32:47 +0000 Received: from bhuna.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e3e3]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYAQ8-0006iJ-GL for linux-mtd@lists.infradead.org; Mon, 11 May 2020 15:32:46 +0000 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id B76402A0945; Mon, 11 May 2020 16:32:42 +0100 (BST) Date: Mon, 11 May 2020 17:32:35 +0200 From: Boris Brezillon To: Miquel Raynal Subject: Re: [PATCH v4 7/8] mtd: rawnand: arasan: Add new Arasan NAND controller Message-ID: <20200511173235.2e2fe467@collabora.com> In-Reply-To: <20200511170729.4766eeaa@xps13> References: <20200508171339.8052-1-miquel.raynal@bootlin.com> <20200508171339.8052-8-miquel.raynal@bootlin.com> <20200510090314.10426b6e@collabora.com> <20200511170729.4766eeaa@xps13> Organization: Collabora X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200511_083244_672838_08758E38 X-CRM114-Status: GOOD ( 22.72 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Michal Simek , Vignesh Raghavendra , Tudor Ambarus , Richard Weinberger , Rob Herring , linux-mtd@lists.infradead.org, Thomas Petazzoni , Naga Sureshkumar Relli Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Mon, 11 May 2020 17:07:29 +0200 Miquel Raynal wrote: > Hi Boris, > > Boris Brezillon wrote on Sun, 10 May > 2020 09:03:14 +0200: > > > On Fri, 8 May 2020 19:13:38 +0200 > > Miquel Raynal wrote: > > > > > +static int anfc_exec_op(struct nand_chip *chip, > > > + const struct nand_operation *op, > > > + bool check_only) > > > +{ > > > + int ret; > > > + > > > + if (check_only) > > > + return nand_op_parser_exec_op(chip, &anfc_op_parser, op, > > > + check_only); > > > > You should also check the DATA_IN/OUT size here ^. > > Here is my proposal: > > ---8<--- > > +static int anfc_check_op(struct nand_chip *chip, > + const struct nand_operation *op) > +{ > + int op_id; > + > + /* > + * The controller abstracts all the NAND operations and do not support > + * data only operations. * FIXME: The nand_op_parser framework should be extended to * support custom checks on DATA instructions. > + */ You also didn't mention the fact that the number of data cycles should be aligned on 4 bytes, and that the controller might read/write more than requested when that's not the case. But maybe you have that comment elsewhere in the code (where you do the round_up(4)?). /* * Number of DATA cycles must be aligned on 4, that means the * controller might read/write more than requested This is * harmless most of the time as extra DATA are discarded in * the write path and read pointer adjusted in the read path. * FIXME: The core should mark operations where reading/writing * more is allowed so the exec_op() implementation can take * the right decision when the alignment constraint is not met: * adjust the number of DATA cycles when it's allowed, and * reject the operation otherwise. */ > + for (op_id = 0; op_id < op->ninstrs; op_id++) { > + instr = &op->instrs[op_id]; > + > + switch (instr->type) { > + case NAND_OP_ADDR_INSTR: > + if (instr->ctx.addr.naddrs > ANFC_MAX_ADDR_CYC) > + return -ENOTSUPP; > + break; > + case NAND_OP_DATA_IN_INSTR: > + case NAND_OP_DATA_OUT_INSTR: > + if (instr->ctx.data.len > ANFC_MAX_CHUNK_SIZE) > + return -ENOTSUPP; > + break; > + default: > + } > + } > + > + /* > + * The controller does not allow to proceed with a CMD+DATA_IN cycle > + * manually on the bus by reading data from the data register. Instead, > + * the controller abstract a status read operation with its own status > + * register after ordering a read status operation. Hence, we cannot > + * support any CMD+DATA_IN operation other than a READ STATUS. * FIXME: The nand_op_parser() framework should be extended to * describe fixed patterns instead of open-coding this check * here. > + */ > + if (op->ninstrs == 2 && > + op->instrs[0].type == NAND_OP_CMD_INSTR && > + op->instrs[0].ctx.cmd.opcode != NAND_CMD_STATUS && > + op->instrs[1].type == NAND_OP_DATA_IN_INSTR) > + return -ENOTSUPP; > + > + return nand_op_parser_exec_op(chip, &anfc_op_parser, op, > + check_only); > +} > + > static int anfc_exec_op(struct nand_chip *chip, > const struct nand_operation *op, > bool check_only) > @@ -774,8 +813,7 @@ static int anfc_exec_op(struct nand_chip *chip, > int ret; > > if (check_only) > - return nand_op_parser_exec_op(chip, &anfc_op_parser, op, > - check_only); > + return anfc_check_op(chip, op); > > ret = anfc_select_target(chip, op->cs); > if (ret) > > --->8--- > > What do you think? ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/