linux-kernel - Re: [PATCH v2] mtd: micron-st: enable lock/unlock for mt25qu512a

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Message-ID: <19800e51-a871-be9f-9eb5-5829237e2613@linaro.org>
Date:   Thu, 13 Jul 2023 06:43:57 +0300
From:   Tudor Ambarus <tudor.ambarus@...aro.org>
To:     Mamta Shukla <mamta.shukla@...ca-geosystems.com>,
        pratyush@...nel.org, michael@...le.cc, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     bsp-development.geo@...ca-geosystems.com
Subject: Re: [PATCH v2] mtd: micron-st: enable lock/unlock for mt25qu512a



On 05.07.2023 18:49, Mamta Shukla wrote:
> mt25qu512a[1] supports locking/unlocking through BP bits in SR.
> 
> Tested using mtd-utils- flash_lock/flash_unlock for MT25QU512ABB8E12.
> 
> Link: https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-b/mt25q_qlkt_u_512_abb_0.pdf?rev=b259aadc3bea49ea8210a41c9ad58211
> Signed-off-by: Mamta Shukla <mamta.shukla@...ca-geosystems.com>
> ---
>  Changes in v2:
>  - add Link tag
>  - fix chip part number mt25ql512a->mt25qu512a
> 
>  drivers/mtd/spi-nor/micron-st.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
> index 4b919756a205..08e94340ebaa 100644
> --- a/drivers/mtd/spi-nor/micron-st.c
> +++ b/drivers/mtd/spi-nor/micron-st.c
> @@ -229,6 +229,8 @@ static const struct flash_info st_nor_parts[] = {
>  		MFR_FLAGS(USE_FSR)
>  	},
>  	{ "mt25qu512a",  INFO6(0x20bb20, 0x104400, 64 * 1024, 1024)
> +		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
> +		      SPI_NOR_BP3_SR_BIT6)
>  		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
>  		FIXUP_FLAGS(SPI_NOR_4B_OPCODES)
>  		MFR_FLAGS(USE_FSR)

Can you try the following instead? We try to use SFDP parsing whenever
possible.
	{ "mt25qu512a",  INFO6(0x20bb20, 0x104400, 0, 0)
		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
		SPI_NOR_BP3_SR_BIT6)
		PARSE_SFDP
		MFR_FLAGS(USE_FSR)

You then have to dump the SFDP tables and do a sanity check to make sure
everything's fine after your changes. You can an example on how to do
that on the commit message from
https://lore.kernel.org/linux-mtd/8b7d2420-26b6-405b-8ef7-75e0a0201402@linaro.org/T/#m3550973e0884ec4a288d344fabd4a9c3b64af46e