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Sat, 2 Nov 2019 11:23:51 +0000 From: To: , Subject: [PATCH v4 15/20] mtd: spi-nor: Extend the QE Read Back test to both SR1 and SR2 Thread-Topic: [PATCH v4 15/20] mtd: spi-nor: Extend the QE Read Back test to both SR1 and SR2 Thread-Index: AQHVkXAAobnx9/kxgESK6sIIzhHB/g== Date: Sat, 2 Nov 2019 11:23:50 +0000 Message-ID: <20191102112316.20715-16-tudor.ambarus@microchip.com> References: <20191102112316.20715-1-tudor.ambarus@microchip.com> In-Reply-To: <20191102112316.20715-1-tudor.ambarus@microchip.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: VI1PR07CA0143.eurprd07.prod.outlook.com (2603:10a6:802:16::30) To MN2PR11MB4448.namprd11.prod.outlook.com (2603:10b6:208:193::29) x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.9.5 x-originating-ip: [86.120.239.29] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: e88365af-509a-4ba6-6082-08d75f8722f3 x-ms-traffictypediagnostic: MN2PR11MB3711: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:1303; 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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: richard@nod.at, Tudor.Ambarus@microchip.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, miquel.raynal@bootlin.com 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 From: Tudor Ambarus In case of 16-bit Write Status Register, check that both SR1 and SR2 were written correctly. Signed-off-by: Tudor Ambarus --- drivers/mtd/spi-nor/spi-nor.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 08fd2c97897d..8f11c00e8ae5 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -2067,6 +2067,7 @@ static int spansion_no_read_cr_quad_enable(struct spi_nor *nor) { u8 *sr_cr = nor->bouncebuf; int ret; + u8 sr_written; /* Keep the current value of the Status Register. */ ret = spi_nor_read_sr(nor, sr_cr); @@ -2075,7 +2076,22 @@ static int spansion_no_read_cr_quad_enable(struct spi_nor *nor) sr_cr[1] = CR_QUAD_EN_SPAN; - return spi_nor_write_sr(nor, sr_cr, 2); + ret = spi_nor_write_sr(nor, sr_cr, 2); + if (ret) + return ret; + + sr_written = sr_cr[0]; + + ret = spi_nor_read_sr(nor, sr_cr); + if (ret) + return ret; + + if (sr_cr[0] != sr_written) { + dev_err(nor->dev, "SR: Read back test failed\n"); + return -EIO; + } + + return 0; } /** @@ -2116,6 +2132,17 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor) if (ret) return ret; + sr_written = sr_cr[0]; + + ret = spi_nor_read_sr(nor, sr_cr); + if (ret) + return ret; + + if (sr_written != sr_cr[0]) { + dev_err(nor->dev, "SR: Read back test failed\n"); + return -EIO; + } + sr_written = sr_cr[1]; /* Read back and check it. */ -- 2.9.5 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/