From: Pratyush Yadav <me@yadavpratyush.com>
To: masonccyang@mxic.com.tw
Cc: Boris Brezillon <boris.brezillon@collabora.com>,
broonie@kernel.org, juliensu@mxic.com.tw,
linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org,
linux-spi@vger.kernel.org, miquel.raynal@bootlin.com,
Pratyush Yadav <p.yadav@ti.com>,
richard@nod.at, tudor.ambarus@microchip.com, vigneshr@ti.com
Subject: Re: [PATCH v2 0/5] mtd: spi-nor: Add support for Octal 8D-8D-8D mode
Date: Wed, 6 May 2020 15:10:28 +0530 [thread overview]
Message-ID: <20200506094028.2asq56goslfd2ngo@yadavpratyush.com> (raw)
In-Reply-To: <OF28AE0642.4F34D6BB-ON4825855F.002D6E58-4825855F.003458C9@mxic.com.tw>
On 05/05/20 05:31PM, masonccyang@mxic.com.tw wrote:
> Hi Pratyush,
> > > I can't apply your patches to enable xSPI Octal mode for
> > > mx25uw51245g because your patches set up Octal protocol first and
> > > then using Octal protocol to write Configuration Register 2(CFG
> > > Reg2). I think driver
> > > should write CFG Reg2 in SPI 1-1-1 mode (power on state) and make sure
> > > write CFG Reg 2 is success and then setup Octa protocol in the last.
> >
> > Register writes should work in 1S mode, because nor->reg_proto is only
> > set _after_ 8D mode is enabled (see spi_nor_octal_dtr_enable()). In
> > fact, both patch 15 and 16 in my series use register writes in 1S mode.
>
> but I didn't see driver roll back "nor->read/write_proto = 1"
> if xxx->octal_dtr_enable() return failed!
I copied what spi_nor_quad_enable() did, and made failure fatal. So if
xxx->octal_dtr_enable() fails, the probe would fail and the flash would
be unusable. You can try your hand at a fallback system where you try
all possible protocols available, but I think that should be a different
patchset.
--
Regards,
Pratyush Yadav
next prev parent reply other threads:[~2020-05-06 9:40 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-21 6:39 [PATCH v2 0/5] mtd: spi-nor: Add support for Octal 8D-8D-8D mode Mason Yang
2020-04-21 6:39 ` [PATCH v2 1/5] " Mason Yang
2020-04-21 6:39 ` [PATCH v2 2/5] mtd: spi-nor: sfdp: Add support for xSPI profile 1.0 table Mason Yang
2020-04-21 6:39 ` [PATCH v2 3/5] mtd: spi-nor: Parse BFPT DWORD-18,19 and 20 for Octal 8D-8D-8D mode Mason Yang
2020-04-21 6:39 ` [PATCH v2 4/5] mtd: spi-nor: macronix: Add Octal 8D-8D-8D supports for Macronix mx25uw51245g Mason Yang
2020-04-21 6:39 ` [PATCH v2 5/5] spi: mxic: Patch for Octal 8D-8D-8D mode support Mason Yang
2020-04-24 15:41 ` kbuild test robot
2020-04-21 7:23 ` [PATCH v2 0/5] mtd: spi-nor: Add support for Octal 8D-8D-8D mode Boris Brezillon
2020-04-21 9:35 ` Vignesh Raghavendra
2020-04-21 12:17 ` Boris Brezillon
2020-04-27 17:55 ` Pratyush Yadav
2020-04-28 6:14 ` masonccyang
2020-04-28 6:34 ` Boris Brezillon
2020-04-28 8:35 ` Pratyush Yadav
2020-04-29 5:59 ` masonccyang
2020-04-28 8:54 ` Pratyush Yadav
2020-04-29 7:31 ` masonccyang
2020-04-29 8:37 ` Boris Brezillon
2020-04-29 18:18 ` Pratyush Yadav
2020-05-05 9:31 ` masonccyang
2020-05-05 9:44 ` Boris Brezillon
2020-05-05 10:01 ` Boris Brezillon
2020-05-11 6:54 ` masonccyang
2020-05-06 9:40 ` Pratyush Yadav [this message]
2020-05-15 2:26 ` masonccyang
2020-05-15 6:55 ` Pratyush Yadav
2020-04-30 8:21 ` Vignesh Raghavendra
2020-05-11 3:23 ` masonccyang
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