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From: Pratyush Yadav <p.yadav@ti.com>
To: <Tudor.Ambarus@microchip.com>
Cc: vigneshr@ti.com, richard@nod.at, nsekhar@ti.com,
	linux-kernel@vger.kernel.org, boris.brezillon@collabora.com,
	linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com
Subject: Re: [PATCH v16 00/15] mtd: spi-nor: add xSPI Octal DTR support
Date: Wed, 28 Oct 2020 18:19:22 +0530
Message-ID: <20201028124920.pot77v4phkqiswhr@ti.com> (raw)
In-Reply-To: <d0d702c1-761b-1480-c74d-135193b33c26@microchip.com>

Hi Tudor,

On 28/10/20 07:53AM, Tudor.Ambarus@microchip.com wrote:
> Hi, Pratyush,
> 
> On 10/5/20 6:31 PM, Pratyush Yadav wrote:
> > Tested on Micron MT35X and S28HS flashes for Octal DTR. 
> 
> Do these flashes define the "Command Sequences to Change to
> Octal DDR (8D-8D-8D) mode" table? Can't we use that table
> instead of defining our own octal dtr enable functions?

The Micron flash does not have this table. The Cypress flash does. The 
problem is that one of the samples of the Cypress flash I tested on had 
incorrect data in that table which meant the sequence would fail. The 
newer samples of the flash have the correct data.

I don't know how many of those faulty flashes are out there in the wild. 
IMO, to be on the safe side spi_nor_cypress_octal_dtr_enable() needs to 
be implemented. So from the point of view of this series there is no 
need to parse the Octal DDR enable table.
 
> I see that Mason used this table for a macronix flash:
> https://patchwork.ozlabs.org/project/linux-mtd/patch/1590737775-4798-4-git-send-email-masonccyang@mxic.com.tw/
> https://patchwork.ozlabs.org/project/linux-mtd/patch/1590737775-4798-8-git-send-email-masonccyang@mxic.com.tw/
> 
> Cheers,
> ta

-- 
Regards,
Pratyush Yadav
Texas Instruments India

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Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-05 15:31 Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 01/15] mtd: spi-nor: core: use EOPNOTSUPP instead of ENOTSUPP Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 02/15] mtd: spi-nor: add spi_nor_controller_ops_{read_reg, write_reg, erase}() Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 03/15] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 04/15] mtd: spi-nor: sfdp: get command opcode extension type from BFPT Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 05/15] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table Pratyush Yadav
2020-10-27  9:58   ` Tudor.Ambarus
2020-10-05 15:31 ` [PATCH v16 06/15] mtd: spi-nor: core: use dummy cycle and address width info from SFDP Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 07/15] mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 08/15] mtd: spi-nor: Introduce SNOR_F_IO_MODE_EN_VOLATILE Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 09/15] mtd: spi-nor: Parse SFDP SCCR Map Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 10/15] mtd: spi-nor: core: enable octal DTR mode when possible Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 11/15] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 12/15] mtd: spi-nor: core: perform a Soft Reset on shutdown Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 13/15] mtd: spi-nor: core: disable Octal DTR mode on suspend Pratyush Yadav
2020-10-05 15:31 ` [PATCH v16 14/15] mtd: spi-nor: spansion: add support for Cypress Semper flash Pratyush Yadav
2020-11-07  7:58   ` Vignesh Raghavendra
2020-11-09 11:45     ` Pratyush Yadav
2020-11-09 13:28     ` Tudor.Ambarus
2020-10-05 15:31 ` [PATCH v16 15/15] mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode Pratyush Yadav
2020-10-06  8:11   ` Tudor.Ambarus
2020-10-28  7:53 ` [PATCH v16 00/15] mtd: spi-nor: add xSPI Octal DTR support Tudor.Ambarus
2020-10-28 12:49   ` Pratyush Yadav [this message]
2020-10-28 15:21     ` Tudor.Ambarus
2020-10-28 20:02       ` Pratyush Yadav
2020-10-29  6:26       ` Vignesh Raghavendra
2020-11-09 17:25 ` Vignesh Raghavendra

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