linux-kernel - Re: [PATCH 1/2] mtd: spi-nor: cadence-quadspi: Refactor indirect read/write sequence.

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Message-ID: <202bc35e-bb32-9ccd-7330-4b4812468834@wedev4u.fr>
Date:   Wed, 20 Dec 2017 16:00:20 +0100
From:   Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
To:     Vignesh R <vigneshr@...com>, Marek Vasut <marek.vasut@...il.com>
Cc:     Dinh Nguyen <dinguyen@...nel.org>, matthew.gerlach@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mtd: spi-nor: cadence-quadspi: Refactor indirect
 read/write sequence.

Hi Vignesh,

Le 07/12/2017 à 07:38, Vignesh R a écrit :
> Move configuring of indirect read/write start address to
> cqspi_indirect_*_execute() function and rename cqspi_indirect_*_setup()
> function. This will help to reuse cqspi_indirect_*_setup() function for
> supporting direct access mode.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>

This patch looks good to me.

Best regards,

Cyrille

> ---
>  drivers/mtd/spi-nor/cadence-quadspi.c | 27 ++++++++++++---------------
>  1 file changed, 12 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
> index 75a2bc447a99..becc7d714ab8 100644
> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
> @@ -450,8 +450,7 @@ static int cqspi_command_write_addr(struct spi_nor *nor,
>  	return cqspi_exec_flash_cmd(cqspi, reg);
>  }
>  
> -static int cqspi_indirect_read_setup(struct spi_nor *nor,
> -				     const unsigned int from_addr)
> +static int cqspi_read_setup(struct spi_nor *nor)
>  {
>  	struct cqspi_flash_pdata *f_pdata = nor->priv;
>  	struct cqspi_st *cqspi = f_pdata->cqspi;
> @@ -459,7 +458,6 @@ static int cqspi_indirect_read_setup(struct spi_nor *nor,
>  	unsigned int dummy_clk = 0;
>  	unsigned int reg;
>  
> -	writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
>  
>  	reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
>  	reg |= cqspi_calc_rdreg(nor, nor->read_opcode);
> @@ -493,8 +491,8 @@ static int cqspi_indirect_read_setup(struct spi_nor *nor,
>  	return 0;
>  }
>  
> -static int cqspi_indirect_read_execute(struct spi_nor *nor,
> -				       u8 *rxbuf, const unsigned n_rx)
> +static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf,
> +				       loff_t from_addr, const size_t n_rx)
>  {
>  	struct cqspi_flash_pdata *f_pdata = nor->priv;
>  	struct cqspi_st *cqspi = f_pdata->cqspi;
> @@ -504,6 +502,7 @@ static int cqspi_indirect_read_execute(struct spi_nor *nor,
>  	unsigned int bytes_to_read = 0;
>  	int ret = 0;
>  
> +	writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
>  	writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
>  
>  	/* Clear all interrupts. */
> @@ -570,8 +569,7 @@ static int cqspi_indirect_read_execute(struct spi_nor *nor,
>  	return ret;
>  }
>  
> -static int cqspi_indirect_write_setup(struct spi_nor *nor,
> -				      const unsigned int to_addr)
> +static int cqspi_write_setup(struct spi_nor *nor)
>  {
>  	unsigned int reg;
>  	struct cqspi_flash_pdata *f_pdata = nor->priv;
> @@ -584,8 +582,6 @@ static int cqspi_indirect_write_setup(struct spi_nor *nor,
>  	reg = cqspi_calc_rdreg(nor, nor->program_opcode);
>  	writel(reg, reg_base + CQSPI_REG_RD_INSTR);
>  
> -	writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
> -
>  	reg = readl(reg_base + CQSPI_REG_SIZE);
>  	reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
>  	reg |= (nor->addr_width - 1);
> @@ -593,8 +589,8 @@ static int cqspi_indirect_write_setup(struct spi_nor *nor,
>  	return 0;
>  }
>  
> -static int cqspi_indirect_write_execute(struct spi_nor *nor,
> -					const u8 *txbuf, const unsigned n_tx)
> +static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
> +					const u8 *txbuf, const size_t n_tx)
>  {
>  	const unsigned int page_size = nor->page_size;
>  	struct cqspi_flash_pdata *f_pdata = nor->priv;
> @@ -604,6 +600,7 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor,
>  	unsigned int write_bytes;
>  	int ret;
>  
> +	writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
>  	writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
>  
>  	/* Clear all interrupts. */
> @@ -900,11 +897,11 @@ static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
>  	if (ret)
>  		return ret;
>  
> -	ret = cqspi_indirect_write_setup(nor, to);
> +	ret = cqspi_write_setup(nor);
>  	if (ret)
>  		return ret;
>  
> -	ret = cqspi_indirect_write_execute(nor, buf, len);
> +	ret = cqspi_indirect_write_execute(nor, to, buf, len);
>  	if (ret)
>  		return ret;
>  
> @@ -920,11 +917,11 @@ static ssize_t cqspi_read(struct spi_nor *nor, loff_t from,
>  	if (ret)
>  		return ret;
>  
> -	ret = cqspi_indirect_read_setup(nor, from);
> +	ret = cqspi_read_setup(nor);
>  	if (ret)
>  		return ret;
>  
> -	ret = cqspi_indirect_read_execute(nor, buf, len);
> +	ret = cqspi_indirect_read_execute(nor, buf, from, len);
>  	if (ret)
>  		return ret;
>  
>