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Tue, 20 Aug 2019 15:24:37 +0000 From: To: , , Subject: Re: [PATCH] spi-nor: intel-spi: Whitelist 4B read commands Thread-Topic: [PATCH] spi-nor: intel-spi: Whitelist 4B read commands Thread-Index: AQHVOKtgwqaYRthXW0GNL3NvkrzY9acEZWOA Date: Tue, 20 Aug 2019 15:24:37 +0000 Message-ID: <409a9e10-e391-2403-5aff-c2e5a361fdef@microchip.com> References: <20190712121401.28578-1-alexander.sverdlin@nokia.com> In-Reply-To: <20190712121401.28578-1-alexander.sverdlin@nokia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: VI1P195CA0011.EURP195.PROD.OUTLOOK.COM (2603:10a6:800:d0::21) To MN2PR11MB4448.namprd11.prod.outlook.com (2603:10b6:208:193::29) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [94.177.32.156] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 5d4ed606-d4b9-4714-f1e1-08d72582834f x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(4652040)(8989299)(5600148)(711020)(4605104)(1401327)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020); 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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 Mika, Would you please review the patch from below? Thanks, ta On 07/12/2019 03:14 PM, Sverdlin, Alexander (Nokia - DE/Ulm) wrote: > External E-Mail > > > From: Alexander Sverdlin > > spi-nor.c issues 4B commands for some Flash chips bigger than 16Mbytes. > Xeon(R) D-1500 documentation mentions its Integrated PCH Logic supports > Flash chips up to 64Mbytes. > D-1500 Integrated PCH documenation however has inconsistencies regarding > FADDR register width and says nothing about particular commands issued > to support 64Mbytes of Flash. > > Nevetheless the tests on Xeon(R) CPU D-1548 with 512Mbit Flash chips > Macronix MX25L51245G and Micron MT25QL512A showed that erase, write and > read operations work just fine after SPINOR_OP_READ_4B and > SPINOR_OP_READ_FAST_4B are white-listed (currently only > SPINOR_OP_READ_FAST_4B is used and only for Macronix). > > Signed-off-by: Alexander Sverdlin > --- > drivers/mtd/spi-nor/intel-spi.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/mtd/spi-nor/intel-spi.c b/drivers/mtd/spi-nor/intel-spi.c > index 1ccf23f..43e55a2e 100644 > --- a/drivers/mtd/spi-nor/intel-spi.c > +++ b/drivers/mtd/spi-nor/intel-spi.c > @@ -621,6 +621,8 @@ static ssize_t intel_spi_read(struct spi_nor *nor, loff_t from, size_t len, > switch (nor->read_opcode) { > case SPINOR_OP_READ: > case SPINOR_OP_READ_FAST: > + case SPINOR_OP_READ_4B: > + case SPINOR_OP_READ_FAST_4B: > break; > default: > return -EINVAL; > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/