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Mon, 23 Sep 2024 08:56:35 +0200 Date: Mon, 23 Sep 2024 08:56:35 +0200 From: Sascha Hauer To: Amit Singh Tomar Cc: Hui-Ping Chen , miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, esben@geanix.com, linux-arm-kernel@lists.infradead.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 2/2] mtd: rawnand: nuvoton: add new driver for the Nuvoton MA35 SoC Message-ID: References: <20240920063749.475604-1-hpchen0nvt@gmail.com> <20240920063749.475604-3-hpchen0nvt@gmail.com> <9245120b-9901-45c3-9a6e-600653f94bba@marvell.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <9245120b-9901-45c3-9a6e-600653f94bba@marvell.com> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-mtd@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240922_235702_110524_BD540D62 X-CRM114-Status: GOOD ( 20.50 ) 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: 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 Hi Amit, On Mon, Sep 23, 2024 at 01:19:03AM +0530, Amit Singh Tomar wrote: > Hi, > > > +static int ma35_nand_do_write(struct nand_chip *chip, const u8 *addr, u32 len) > > +{ > > + struct ma35_nand_info *nand = nand_get_controller_data(chip); > > + struct mtd_info *mtd = nand_to_mtd(chip); > > + dma_addr_t dma_addr; > > + int ret = 0, i; > > + u32 reg; > > + > > + if (len != mtd->writesize) { > > + for (i = 0; i < len; i++) > > + writel(addr[i], nand->regs + MA35_NFI_REG_NANDDATA); > > + return 0; > > + } > > + > > + ma35_nand_dmac_init(nand); > > + > > + writel(mtd->oobsize, nand->regs + MA35_NFI_REG_NANDRACTL); > > + > > + writel(INT_DMA, nand->regs + MA35_NFI_REG_NANDINTEN); > > + /* To mark this page as dirty. */ > > + reg = readl(nand->regs + MA35_NFI_REG_NANDRA0); > > + if (reg & 0xffff0000) > > + writel(reg & 0xffff, nand->regs + MA35_NFI_REG_NANDRA0); > > + > > + dma_addr = dma_map_single(nand->dev, (void *)addr, len, DMA_TO_DEVICE); > > + ret = dma_mapping_error(nand->dev, dma_addr); > > + if (ret) { > > + dev_err(nand->dev, "dma mapping error\n"); > > + return -EINVAL; > Shouldn't this return -ENOMEM or simply ret when there's an error? Also, > should we consider unmapping the page with dma_unmap_single in that case? When dma_map_single() returns an error the pages are not mapped, no need to unmap then. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/