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Thu, 23 Dec 2021 13:11:51 +0000 From: To: , , , , , , , , Subject: Re: [PATCH v2 2/6] mtd: spi-nor: spansion: write 2 bytes when disabling Octal DTR mode Thread-Topic: [PATCH v2 2/6] mtd: spi-nor: spansion: write 2 bytes when disabling Octal DTR mode Thread-Index: AQHX9/3dZMPS/7j9wEKlAvg+zFmXJ6xADU8A Date: Thu, 23 Dec 2021 13:11:51 +0000 Message-ID: References: <20210531181757.19458-1-p.yadav@ti.com> <20210531181757.19458-3-p.yadav@ti.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microchip.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 575701b2-de69-457f-a67d-08d9c615c8c1 x-ms-traffictypediagnostic: SN6PR11MB2943:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 12/23/21 3:06 PM, Tudor Ambarus wrote: > On 5/31/21 9:17 PM, Pratyush Yadav wrote: >> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >> >> The Octal DTR configuration is stored in the CFR5V register. This >> register is 1 byte wide. But 1 byte long transactions are not allowed in >> 8D-8D-8D mode. Since the next byte address does not contain any >> register, it is safe to write any value to it. Write a 0 to it. >> >> Signed-off-by: Pratyush Yadav >> --- >> >> (no changes since v1) >> >> drivers/mtd/spi-nor/spansion.c | 18 +++++++++++++----- >> 1 file changed, 13 insertions(+), 5 deletions(-) >> >> diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c >> index ee82dcd75310..e6bf5c9eee6a 100644 >> --- a/drivers/mtd/spi-nor/spansion.c >> +++ b/drivers/mtd/spi-nor/spansion.c >> @@ -65,10 +65,18 @@ static int spi_nor_cypress_octal_dtr_enable(struct spi_nor *nor, bool enable) >> if (ret) >> return ret; >> >> - if (enable) >> - *buf = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN; >> - else >> - *buf = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS; >> + if (enable) { >> + buf[0] = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN; >> + } else { >> + /* >> + * The register is 1-byte wide, but 1-byte transactions are not >> + * allowed in 8D-8D-8D mode. Since there is no register at the >> + * next location, just initialize the value to 0 and let the >> + * transaction go on. >> + */ >> + buf[0] = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS; >> + buf[1] = 0; > > how about writing 0xff instead? patches 1, 2 and 3 look fine, except for this comment. Would you resend them, or you want me to do the change locally when applying? Send me an updated comment if so. > >> + } >> >> op = (struct spi_mem_op) >> SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1), >> @@ -76,7 +84,7 @@ static int spi_nor_cypress_octal_dtr_enable(struct spi_nor *nor, bool enable) >> SPINOR_REG_CYPRESS_CFR5V, >> 1), >> SPI_MEM_OP_NO_DUMMY, >> - SPI_MEM_OP_DATA_OUT(1, buf, 1)); >> + SPI_MEM_OP_DATA_OUT(enable ? 1 : 2, buf, 1)); >> >> if (!enable) >> spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR); >> -- >> 2.30.0 >> > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/