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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 1jbJe3-0004hv-2I; Wed, 20 May 2020 08:00:07 +0000 Received: from twhmllg3.macronix.com ([211.75.127.131]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbJdz-00047e-W7; Wed, 20 May 2020 08:00:05 +0000 Received: from twhfmlp1.macronix.com (twhfmlp1.macronix.com [172.17.20.91]) by TWHMLLG3.macronix.com with ESMTP id 04K7xUdE096136; Wed, 20 May 2020 15:59:30 +0800 (GMT-8) (envelope-from masonccyang@mxic.com.tw) Received: from MXML06C.mxic.com.tw (mxml06c.mxic.com.tw [172.17.14.55]) by Forcepoint Email with ESMTP id B9D79C5271EE9FAE1410; Wed, 20 May 2020 15:59:30 +0800 (CST) In-Reply-To: <20200519142642.24131-10-p.yadav@ti.com> References: <20200519142642.24131-1-p.yadav@ti.com> <20200519142642.24131-10-p.yadav@ti.com> To: "Pratyush Yadav" Subject: Re: [PATCH v5 09/19] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table MIME-Version: 1.0 X-KeepSent: 83616464:480FA751-4825856E:002A4483; type=4; name=$KeepSent X-Mailer: Lotus Notes Release 8.5.3FP4 SHF90 June 10, 2013 Message-ID: From: masonccyang@mxic.com.tw Date: Wed, 20 May 2020 15:59:31 +0800 X-MIMETrack: Serialize by Router on MXML06C/TAIWAN/MXIC(Release 9.0.1FP10 HF265|July 25, 2018) at 2020/05/20 PM 03:59:30, Serialize complete at 2020/05/20 PM 03:59:30 X-MAIL: TWHMLLG3.macronix.com 04K7xUdE096136 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200520_010004_287484_6A8D0C85 X-CRM114-Status: GOOD ( 10.66 ) 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: Alexandre Belloni , Vignesh Raghavendra , Tudor Ambarus , juliensu@mxic.com.tw, Richard Weinberger , Mark Brown , Nicolas Ferre , Sekhar Nori , linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, Ludovic Desroches , Boris Brezillon , linux-mediatek@lists.infradead.org, Miquel Raynal , Matthias Brugger , linux-mtd@lists.infradead.org, Pratyush Yadav , linux-arm-kernel@lists.infradead.org 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 Pratyush, > +/** > + * spi_nor_parse_profile1() - parse the xSPI Profile 1.0 table > + * @nor: pointer to a 'struct spi_nor' > + * @param_header: pointer to the 'struct sfdp_parameter_header' describing > + * the 4-Byte Address Instruction Table length and version. > + * @params: pointer to the 'struct spi_nor_flash_parameter' to be. > + * > + * Return: 0 on success, -errno otherwise. > + */ > +static int spi_nor_parse_profile1(struct spi_nor *nor, > + const struct sfdp_parameter_header *profile1_header, > + struct spi_nor_flash_parameter *params) > +{ > + u32 *table, opcode, addr; > + size_t len; > + int ret, i; > + > + len = profile1_header->length * sizeof(*table); > + table = kmalloc(len, GFP_KERNEL); > + if (!table) > + return -ENOMEM; > + > + addr = SFDP_PARAM_HEADER_PTP(profile1_header); > + ret = spi_nor_read_sfdp(nor, addr, len, table); > + if (ret) > + goto out; > + > + /* Fix endianness of the table DWORDs. */ > + for (i = 0; i < profile1_header->length; i++) > + table[i] = le32_to_cpu(table[i]); > + > + /* Get 8D-8D-8D fast read opcode and dummy cycles. */ > + opcode = FIELD_GET(PROFILE1_DWORD1_RD_FAST_CMD, table[0]); > + > + /* > + * Update the fast read settings. We set the default dummy cycles to 20 > + * here. Flashes can change this value if they need to when enabling > + * octal mode. > + */ > + spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_8_8_8_DTR], > + 0, 20, opcode, > + SNOR_PROTO_8_8_8_DTR); > + I thought we have a agreement that only do parse here, no other read parameters setting. Driver should get dummy cycles used for various frequencies from 4th and 5th DWORD of xSPI table.[1] [1] https://patchwork.ozlabs.org/project/linux-mtd/patch/1587451187-6889-3-git-send-email-masonccyang@mxic.com.tw/ In addition, 20 dummy cycles is for 200MHz but not for 100MHz, 133MHz and 166MHz in case of read performance concern. Given a correct dummy cycles for a specific device. [2] [2] https://patchwork.ozlabs.org/project/linux-mtd/patch/1587451187-6889-5-git-send-email-masonccyang@mxic.com.tw/ > + /* > + * Set the Read Status Register dummy cycles and dummy address bytes. > + */ > + if (table[0] & PROFILE1_DWORD1_RDSR_DUMMY) > + params->rdsr_dummy = 8; > + else > + params->rdsr_dummy = 4; > + > + if (table[0] & PROFILE1_DWORD1_RDSR_ADDR_BYTES) > + params->rdsr_addr_nbytes = 4; > + else > + params->rdsr_addr_nbytes = 0; > + > +out: > + kfree(table); > + return ret; > +} > + thanks & best regards, Mason CONFIDENTIALITY NOTE: This e-mail and any attachments may contain confidential information and/or personal data, which is protected by applicable laws. Please be reminded that duplication, disclosure, distribution, or use of this e-mail (and/or its attachments) or any part thereof is prohibited. If you receive this e-mail in error, please notify us immediately and delete this mail as well as its attachment(s) from your system. 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