Re: [PATCH v4 01/20] mtd: spi-nor: Use dev_dbg insted of dev_err for low level info

[Vignesh Raghavendra]

Hi,

On 02/11/19 4:53 PM, Tudor.Ambarus@xxxxxxxxxxxxx wrote:
> From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> 
> What most users care about is "my dev is not working properly".
> All low level information should be discovered when activating
> the debug traces.
> 
> Keep error messages for just three cases:
> - when the JEDEC ID is not recognized
> - when the resume() call fails
> - when the spi_nor_check() fails.
> 
> Suggested-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 52 +++++++++++++++++++++----------------------
>  1 file changed, 26 insertions(+), 26 deletions(-)
> 
[...]
>  
> @@ -679,9 +679,9 @@ static int spi_nor_sr_ready(struct spi_nor *nor)
>  	if (nor->flags & SNOR_F_USE_CLSR &&
>  	    nor->bouncebuf[0] & (SR_E_ERR | SR_P_ERR)) {
>  		if (nor->bouncebuf[0] & SR_E_ERR)
> -			dev_err(nor->dev, "Erase Error occurred\n");
> +			dev_dbg(nor->dev, "Erase Error occurred\n");
>  		else
> -			dev_err(nor->dev, "Programming Error occurred\n");
> +			dev_dbg(nor->dev, "Programming Error occurred\n");
>  
>  		spi_nor_clear_sr(nor);
>  		return -EIO;
> @@ -714,12 +714,12 @@ static int spi_nor_fsr_ready(struct spi_nor *nor)
>  
>  	if (nor->bouncebuf[0] & (FSR_E_ERR | FSR_P_ERR)) {
>  		if (nor->bouncebuf[0] & FSR_E_ERR)
> -			dev_err(nor->dev, "Erase operation failed.\n");
> +			dev_dbg(nor->dev, "Erase operation failed.\n");
>  		else
> -			dev_err(nor->dev, "Program operation failed.\n");
> +			dev_dbg(nor->dev, "Program operation failed.\n");
>  
>  		if (nor->bouncebuf[0] & FSR_PT_ERR)
> -			dev_err(nor->dev,
> +			dev_dbg(nor->dev,
>  			"Attempted to modify a protected sector.\n");
> 

Since, we are specifically parsing FSR bits to know the reason for
failure, I think we should use dev_err()s here.
I specifically like the last one which informs the user that
program/erase operation failed as sector was write protected.

Rest looks fine to me:

Reviewed-by: Vignesh Raghavendra <vigneshr@xxxxxx>

Regards
Vignesh

>  		spi_nor_clear_fsr(nor);
> @@ -770,7 +770,7 @@ static int spi_nor_wait_till_ready_with_timeout(struct spi_nor *nor,
>  		cond_resched();
>  	}
>  
> -	dev_err(nor->dev, "flash operation timed out\n");
> +	dev_dbg(nor->dev, "flash operation timed out\n");
>  
>  	return -ETIMEDOUT;
>  }
> @@ -807,7 +807,7 @@ static int spi_nor_write_sr_cr(struct spi_nor *nor, const u8 *sr_cr)
>  	}
>  
>  	if (ret) {
> -		dev_err(nor->dev,
> +		dev_dbg(nor->dev,
>  			"error while writing configuration register\n");
>  		return -EINVAL;
>  	}
> @@ -1771,7 +1771,7 @@ static int macronix_quad_enable(struct spi_nor *nor)
>  		return ret;
>  
>  	if (!(nor->bouncebuf[0] & SR_QUAD_EN_MX)) {
> -		dev_err(nor->dev, "Macronix Quad bit not set\n");
> +		dev_dbg(nor->dev, "Macronix Quad bit not set\n");
>  		return -EINVAL;
>  	}
>  
> @@ -1819,7 +1819,7 @@ static int spansion_quad_enable(struct spi_nor *nor)
>  		return ret;
>  
>  	if (!(nor->bouncebuf[0] & CR_QUAD_EN_SPAN)) {
> -		dev_err(nor->dev, "Spansion Quad bit not set\n");
> +		dev_dbg(nor->dev, "Spansion Quad bit not set\n");
>  		return -EINVAL;
>  	}
>  
> @@ -1897,7 +1897,7 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor)
>  		return ret;
>  
>  	if (!(sr_cr[1] & CR_QUAD_EN_SPAN)) {
> -		dev_err(nor->dev, "Spansion Quad bit not set\n");
> +		dev_dbg(nor->dev, "Spansion Quad bit not set\n");
>  		return -EINVAL;
>  	}
>  
> @@ -1935,7 +1935,7 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
>  
>  	ret = spi_nor_write_sr2(nor, sr2);
>  	if (ret) {
> -		dev_err(nor->dev, "error while writing status register 2\n");
> +		dev_dbg(nor->dev, "error while writing status register 2\n");
>  		return ret;
>  	}
>  
> @@ -1949,7 +1949,7 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
>  		return ret;
>  
>  	if (!(*sr2 & SR2_QUAD_EN_BIT7)) {
> -		dev_err(nor->dev, "SR2 Quad bit not set\n");
> +		dev_dbg(nor->dev, "SR2 Quad bit not set\n");
>  		return -EINVAL;
>  	}
>  
> @@ -1978,7 +1978,7 @@ static int spi_nor_clear_sr_bp(struct spi_nor *nor)
>  
>  	ret = spi_nor_write_sr(nor, nor->bouncebuf[0] & ~mask);
>  	if (ret) {
> -		dev_err(nor->dev, "write to status register failed\n");
> +		dev_dbg(nor->dev, "write to status register failed\n");
>  		return ret;
>  	}
>  
> @@ -2525,7 +2525,7 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
>  						    SPI_NOR_MAX_ID_LEN);
>  	}
>  	if (tmp) {
> -		dev_err(nor->dev, "error %d reading JEDEC ID\n", tmp);
> +		dev_dbg(nor->dev, "error %d reading JEDEC ID\n", tmp);
>  		return ERR_PTR(tmp);
>  	}
>  
> @@ -2740,7 +2740,7 @@ static int s3an_nor_setup(struct spi_nor *nor,
>  
>  	ret = spi_nor_xread_sr(nor, nor->bouncebuf);
>  	if (ret) {
> -		dev_err(nor->dev, "error %d reading XRDSR\n", ret);
> +		dev_dbg(nor->dev, "error %d reading XRDSR\n", ret);
>  		return ret;
>  	}
>  
> @@ -4102,7 +4102,7 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
>  		err = spi_nor_read_sfdp(nor, sizeof(header),
>  					psize, param_headers);
>  		if (err < 0) {
> -			dev_err(dev, "failed to read SFDP parameter headers\n");
> +			dev_dbg(dev, "failed to read SFDP parameter headers\n");
>  			goto exit;
>  		}
>  	}
> @@ -4349,7 +4349,7 @@ static int spi_nor_default_setup(struct spi_nor *nor,
>  	/* Select the (Fast) Read command. */
>  	err = spi_nor_select_read(nor, shared_mask);
>  	if (err) {
> -		dev_err(nor->dev,
> +		dev_dbg(nor->dev,
>  			"can't select read settings supported by both the SPI controller and memory.\n");
>  		return err;
>  	}
> @@ -4357,7 +4357,7 @@ static int spi_nor_default_setup(struct spi_nor *nor,
>  	/* Select the Page Program command. */
>  	err = spi_nor_select_pp(nor, shared_mask);
>  	if (err) {
> -		dev_err(nor->dev,
> +		dev_dbg(nor->dev,
>  			"can't select write settings supported by both the SPI controller and memory.\n");
>  		return err;
>  	}
> @@ -4365,7 +4365,7 @@ static int spi_nor_default_setup(struct spi_nor *nor,
>  	/* Select the Sector Erase command. */
>  	err = spi_nor_select_erase(nor);
>  	if (err) {
> -		dev_err(nor->dev,
> +		dev_dbg(nor->dev,
>  			"can't select erase settings supported by both the SPI controller and memory.\n");
>  		return err;
>  	}
> @@ -4686,7 +4686,7 @@ static int spi_nor_init(struct spi_nor *nor)
>  
>  		err = nor->clear_sr_bp(nor);
>  		if (err) {
> -			dev_err(nor->dev,
> +			dev_dbg(nor->dev,
>  				"fail to clear block protection bits\n");
>  			return err;
>  		}
> @@ -4694,7 +4694,7 @@ static int spi_nor_init(struct spi_nor *nor)
>  
>  	err = spi_nor_quad_enable(nor);
>  	if (err) {
> -		dev_err(nor->dev, "quad mode not supported\n");
> +		dev_dbg(nor->dev, "quad mode not supported\n");
>  		return err;
>  	}
>  
> @@ -4762,7 +4762,7 @@ static int spi_nor_set_addr_width(struct spi_nor *nor)
>  	}
>  
>  	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
> -		dev_err(nor->dev, "address width is too large: %u\n",
> +		dev_dbg(nor->dev, "address width is too large: %u\n",
>  			nor->addr_width);
>  		return -EINVAL;
>  	}
> 

-- 
Regards
Vignesh