linux-kernel - Re: [PATCH] mtd: spi-nor: gigadevice: gd25q256: replace gd25q256_default_init with gd25q256_post

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Message-ID: <1dddc60f-44fd-df65-f491-be8379fe2380@microchip.com>
Date:   Mon, 3 Oct 2022 05:35:34 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <yaliang.wang@...driver.com>, <pratyush@...nel.org>,
        <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: gigadevice: gd25q256: replace
 gd25q256_default_init with gd25q256_post_bfpt

On 9/13/22 11:40, yaliang.wang@...driver.com wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> From: Yaliang Wang <Yaliang.Wang@...driver.com>
> 
> When utilizing PARSE_SFDP to initialize the flash parameter, the
> deprecated initializing method spi_nor_init_params_deprecated() and the
> function spi_nor_manufacturer_init_params() within it will never be
> executed, which results in the default_init hook function will also never
> be executed. As we do have quad enable function defined in BFPT, the
> post_bfpt hook will be the right place to tweak the function.
> 
> Cc: stable@...r.kernel.org
> Fixes: 047275f7de18 ("mtd: spi-nor: gigadevice: gd25q256: Init flash based on SFDP")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Yaliang Wang <Yaliang.Wang@...driver.com>
> ---
>  drivers/mtd/spi-nor/gigadevice.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/gigadevice.c b/drivers/mtd/spi-nor/gigadevice.c
> index 119b38e6fc2a..bdc4d73424af 100644
> --- a/drivers/mtd/spi-nor/gigadevice.c
> +++ b/drivers/mtd/spi-nor/gigadevice.c
> @@ -8,19 +8,24 @@
> 
>  #include "core.h"
> 
> -static void gd25q256_default_init(struct spi_nor *nor)
> +static int
> +gd25q256_post_bfpt(struct spi_nor *nor,
> +                  const struct sfdp_parameter_header *bfpt_header,
> +                  const struct sfdp_bfpt *bfpt)
>  {
>         /*
>          * Some manufacturer like GigaDevice may use different
>          * bit to set QE on different memories, so the MFR can't
>          * indicate the quad_enable method for this case, we need
> -        * to set it in the default_init fixup hook.
> +        * to set it in the post_bfpt fixup hook.
>          */
>         nor->params->quad_enable = spi_nor_sr1_bit6_quad_enable;
> +
> +       return 0;
>  }

Maybe we can get rid of this fixup hook entirely. If it was a default_init(), then it
was set before the SFDP was parsed, so the quad_enable method was overwritten anyway.
Would you please check why this method was introduced?

What Quad Enable method do you get from SFDP? I expect that spi_nor_sr1_bit6_quad_enable,
and the fixup hook to be in vain.

> 
>  static const struct spi_nor_fixups gd25q256_fixups = {
> -       .default_init = gd25q256_default_init,
> +       .post_bfpt = gd25q256_post_bfpt,
>  };
> 
>  static const struct flash_info gigadevice_nor_parts[] = {
> --
> 2.34.1
> 


-- 
Cheers,
ta