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Message-ID: <9cc81d00-7cce-93ef-7d43-adef519b1c95@linaro.org>
Date:   Wed, 26 Jul 2023 09:56:13 +0300
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Subject: Re: [RESEND PATCH v3 11/11] mtd: spi-nor: spansion: switch
 cypress_nor_get_page_size() to use vreg_offset
To:     Takahiro Kuwano <tkuw584924@gmail.com>,
        takahiro.kuwano@infineon.com, michael@walle.cc
Cc:     pratyush@kernel.org, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org, bacem.daassi@infineon.com,
        miquel.raynal@bootlin.com, richard@nod.at
References: <20230724081247.4779-1-tudor.ambarus@linaro.org>
 <20230724081247.4779-12-tudor.ambarus@linaro.org>
 <40acee64-439c-8a93-2788-da4249cb714a@gmail.com>
From:   Tudor Ambarus <tudor.ambarus@linaro.org>
Content-Language: en-US
In-Reply-To: <40acee64-439c-8a93-2788-da4249cb714a@gmail.com>
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On 26.07.2023 07:15, Takahiro Kuwano wrote:
> Hi Tudor,
> 
> On 7/24/2023 5:12 PM, Tudor Ambarus wrote:
>> All users of cypress_nor_get_page_size() retrieve n_dice and vreg_offset
>> from SFDP. Switch cypress_nor_get_page_size() to always use vreg_offset
>> so that we use the same code base for both single and multi chip package
>> flashes. cypress_nor_get_page_size() is now called in the post_sfdp()
>> hook instead of post_bfpt(), as vreg_offset and n_dice are parsed after
>> BFPT and we now use them to get the page size in the post_sfdp hook.
>> Consequently the null checks on n_dice and vreg_offset are moved to
>> the post_sfdp() hook.
>>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
>> ---
>>  drivers/mtd/spi-nor/spansion.c | 105 +++++++++++++--------------------
>>  1 file changed, 42 insertions(+), 63 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
>> index 4027f0038ce5..0b01af33aa57 100644
>> --- a/drivers/mtd/spi-nor/spansion.c
>> +++ b/drivers/mtd/spi-nor/spansion.c
>> @@ -471,28 +471,17 @@ static int cypress_nor_set_addr_mode_nbytes(struct spi_nor *nor)
>>  	return 0;
>>  }
>>  
>> -static int cypress_nor_get_page_size_single_chip(struct spi_nor *nor)
>> -{
>> -	struct spi_mem_op op =
>> -		CYPRESS_NOR_RD_ANY_REG_OP(nor->params->addr_mode_nbytes,
>> -					  SPINOR_REG_CYPRESS_CFR3V, 0,
>> -					  nor->bouncebuf);
>> -	int ret;
>> -
>> -	ret = spi_nor_read_any_reg(nor, &op, nor->reg_proto);
>> -	if (ret)
>> -		return ret;
>> -
>> -	if (nor->bouncebuf[0] & SPINOR_REG_CYPRESS_CFR3_PGSZ)
>> -		nor->params->page_size = 512;
>> -	else
>> -		nor->params->page_size = 256;
>> -
>> -	return 0;
>> -}
>> -
>> -
>> -static int cypress_nor_get_page_size_mcp(struct spi_nor *nor)
>> +/**
>> + * cypress_nor_get_page_size() - Get flash page size configuration.
>> + * @nor:	pointer to a 'struct spi_nor'
>> + *
>> + * The BFPT table advertises a 512B or 256B page size depending on part but the
>> + * page size is actually configurable (with the default being 256B). Read from
>> + * CFR3V[4] and set the correct size.
>> + *
>> + * Return: 0 on success, -errno otherwise.
>> + */
>> +static int cypress_nor_get_page_size(struct spi_nor *nor)
>>  {
>>  	struct spi_mem_op op =
>>  		CYPRESS_NOR_RD_ANY_REG_OP(nor->params->addr_mode_nbytes,
>> @@ -522,23 +511,6 @@ static int cypress_nor_get_page_size_mcp(struct spi_nor *nor)
>>  	return 0;
>>  }
>>  
>> -/**
>> - * cypress_nor_get_page_size() - Get flash page size configuration.
>> - * @nor:	pointer to a 'struct spi_nor'
>> - *
>> - * The BFPT table advertises a 512B or 256B page size depending on part but the
>> - * page size is actually configurable (with the default being 256B). Read from
>> - * CFR3V[4] and set the correct size.
>> - *
>> - * Return: 0 on success, -errno otherwise.
>> - */
>> -static int cypress_nor_get_page_size(struct spi_nor *nor)
>> -{
>> -	if (nor->params->n_dice)
>> -		return cypress_nor_get_page_size_mcp(nor);
>> -	return cypress_nor_get_page_size_single_chip(nor);
>> -}
>> -
>>  static void cypress_nor_ecc_init(struct spi_nor *nor)
>>  {
>>  	/*
>> @@ -575,20 +547,26 @@ s25fs256t_post_bfpt_fixup(struct spi_nor *nor,
>>  	if (nor->bouncebuf[0])
>>  		return -ENODEV;
>>  
>> -	return cypress_nor_get_page_size(nor);
>> +	return 0;
>>  }
>>  
>>  static int s25fs256t_post_sfdp_fixup(struct spi_nor *nor)
>>  {
>>  	struct spi_nor_flash_parameter *params = nor->params;
>>  
>> +	if (!params->n_dice || !params->vreg_offset) {
>> +		dev_err(nor->dev, "%s failed. The volatile register offset could not be retrieved from SFDP.\n",
>> +			__func__);
>> +		return -EOPNOTSUPP;
>> +	}
>> +
> S25FS256T failed here. I realized that S25FS256T doesn't have SCCR map...
> With fix like below, it works. Make sense?

Yes it does, will resubmit.
> 
> 	params->vreg_offset = devm_kmalloc(nor->dev, sizeof(u32), GFP_KERNEL);
> 	if (!params->vreg_offset)
> 		return -ENOMEM;
> 
> 	params->vreg_offset[0] = SPINOR_REG_CYPRESS_VREG;
> 	params->n_dice = 1;
> 
> 
>>  	/* PP_1_1_4_4B is supported but missing in 4BAIT. */
>>  	params->hwcaps.mask |= SNOR_HWCAPS_PP_1_1_4;
>>  	spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP_1_1_4],
>>  				SPINOR_OP_PP_1_1_4_4B,
>>  				SNOR_PROTO_1_1_4);
>>  
>> -	return 0;
>> +	return cypress_nor_get_page_size(nor);
>>  }
>>  
>>  static int s25fs256t_late_init(struct spi_nor *nor)
>> @@ -623,10 +601,20 @@ s25hx_t_post_bfpt_fixup(struct spi_nor *nor,
>>  
>>  static int s25hx_t_post_sfdp_fixup(struct spi_nor *nor)
>>  {
>> -	struct spi_nor_erase_type *erase_type =
>> -					nor->params->erase_map.erase_type;
>> +	struct spi_nor_flash_parameter *params = nor->params;
>> +	struct spi_nor_erase_type *erase_type = params->erase_map.erase_type;
>>  	unsigned int i;
>>  
>> +	if (!params->n_dice || !params->vreg_offset) {
>> +		dev_err(nor->dev, "%s failed. The volatile register offset could not be retrieved from SFDP.\n",
>> +			__func__);
>> +		return -EOPNOTSUPP;
>> +	}
>> +
>> +	/* The 2 Gb parts duplicate info and advertise 4 dice instead of 2. */
>> +	if (params->size == SZ_256M)
>> +		params->n_dice = 2;
>> +
>>  	/*
>>  	 * In some parts, 3byte erase opcodes are advertised by 4BAIT.
>>  	 * Convert them to 4byte erase opcodes.
>> @@ -644,10 +632,6 @@ static int s25hx_t_post_sfdp_fixup(struct spi_nor *nor)
>>  		}
>>  	}
>>  
>> -	/* The 2 Gb parts duplicate info and advertise 4 dice instead of 2. */
>> -	if (nor->params->size == SZ_256M)
>> -		nor->params->n_dice = 2;
>> -
>>  	return cypress_nor_get_page_size(nor);
>>  }
>>  
>> @@ -655,12 +639,6 @@ static int s25hx_t_late_init(struct spi_nor *nor)
>>  {
>>  	struct spi_nor_flash_parameter *params = nor->params;
>>  
>> -	if (!params->n_dice || !params->vreg_offset) {
>> -		dev_err(nor->dev, "%s failed. The volatile register offset could not be retrieved from SFDP.\n",
>> -			__func__);
>> -		return -EOPNOTSUPP;
>> -	}
>> -
>>  	/* Fast Read 4B requires mode cycles */
>>  	params->reads[SNOR_CMD_READ_FAST].num_mode_clocks = 8;
>>  	params->ready = cypress_nor_sr_ready_and_clear;
>> @@ -694,6 +672,17 @@ static int cypress_nor_set_octal_dtr(struct spi_nor *nor, bool enable)
>>  static int s28hx_t_post_sfdp_fixup(struct spi_nor *nor)
>>  {
>>  	struct spi_nor_flash_parameter *params = nor->params;
>> +
>> +	if (!params->n_dice || !params->vreg_offset) {
>> +		dev_err(nor->dev, "%s failed. The volatile register offset could not be retrieved from SFDP.\n",
>> +			__func__);
>> +		return -EOPNOTSUPP;
>> +	}
>> +
>> +	/* The 2 Gb parts duplicate info and advertise 4 dice instead of 2. */
>> +	if (params->size == SZ_256M)
>> +		params->n_dice = 2;
>> +
>>  	/*
>>  	 * On older versions of the flash the xSPI Profile 1.0 table has the
>>  	 * 8D-8D-8D Fast Read opcode as 0x00. But it actually should be 0xEE.
>> @@ -719,10 +708,6 @@ static int s28hx_t_post_sfdp_fixup(struct spi_nor *nor)
>>  	 */
>>  	params->rdsr_addr_nbytes = 4;
>>  
>> -	/* The 2 Gb parts duplicate info and advertise 4 dice instead of 2. */
>> -	if (params->size == SZ_256M)
>> -		params->n_dice = 2;
>> -
>>  	return cypress_nor_get_page_size(nor);
>>  }
>>  
>> @@ -737,12 +722,6 @@ static int s28hx_t_late_init(struct spi_nor *nor)
>>  {
>>  	struct spi_nor_flash_parameter *params = nor->params;
>>  
>> -	if (!params->n_dice || !params->vreg_offset) {
>> -		dev_err(nor->dev, "%s failed. The volatile register offset could not be retrieved from SFDP.\n",
>> -			__func__);
>> -		return -EOPNOTSUPP;
>> -	}
>> -
>>  	params->set_octal_dtr = cypress_nor_set_octal_dtr;
>>  	params->ready = cypress_nor_sr_ready_and_clear;
>>  	cypress_nor_ecc_init(nor);
> 
> All other S25Hx and S28Hx devices work fine.
> 

Good!