linux-kernel - Re: [PATCH v4 07/13] spi: airoha: fix reading/writing of flashes with more than one plane per lun

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Message-ID: <aKl9hOx2hcZUfg-k@lore-rh-laptop>
Date: Sat, 23 Aug 2025 10:36:20 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
Cc: Ray Liu <ray.liu@...oha.com>, Mark Brown <broonie@...nel.org>,
	Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>,
	linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 07/13] spi: airoha: fix reading/writing of flashes
 with more than one plane per lun

> Reading UBI on the flash with more than one plane per lun will lead to
> the following error:
> 
> ubi0: default fastmap WL pool size: 50
> ubi0: attaching mtd2
> ubi0 error: ubi_add_to_av: two LEBs with same sequence number 403
> eraseblock attaching information dump:
>         ec       1
>         pnum     538
>         lnum     0
>         scrub    0
>         sqnum    403
> Volume identifier header dump:
>         magic     55424921
>         version   1
>         vol_type  1
>         copy_flag 0
>         compat    0
>         vol_id    1
>         lnum      0
>         data_size 0
>         used_ebs  0
>         data_pad  0
>         sqnum     403
>         hdr_crc   c8418a31
> Volume identifier header hexdump:
> 00000000: 55 42 49 21 01 01 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  UBI!............................
> 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 93 00 00 00 00 00 00 00 00 00 00 00 00 c8 41 8a 31  .............................A.1
> ubi0 error: ubi_attach_mtd_dev: failed to attach mtd2, error -22
> UBI error: cannot attach mtd2
> UBI error: cannot initialize UBI, error -22
> UBI init error 22
> 
> looking to spi_mem_no_dirmap_read() code we'll see:
> 
> 	static ssize_t spi_mem_no_dirmap_read(struct spi_mem_dirmap_desc *desc,
> 					      u64 offs, size_t len, void *buf)
> 	{
> 		struct spi_mem_op op = desc->info.op_tmpl;
> 		int ret;
> 
> // --- see here ---
> 		op.addr.val = desc->info.offset + offs;
> //-----------------
> 		op.data.buf.in = buf;
> 		op.data.nbytes = len;
> 		ret = spi_mem_adjust_op_size(desc->mem, &op);
> 		if (ret)
> 		return ret;
> 
> 		ret = spi_mem_exec_op(desc->mem, &op);
> 		if (ret)
> 			return ret;
> 
> 		return op.data.nbytes;
> 	}
> 
> The similar happens for spi_mem_no_dirmap_write(). Thus spi read address should
> take in the account the desc->info.offset.
> 
> Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>

Missing Fixes tag.

Regards,
Lorenzo

> ---
>  drivers/spi/spi-airoha-snfi.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c
> index 3431a9c84679..df2d3d717c00 100644
> --- a/drivers/spi/spi-airoha-snfi.c
> +++ b/drivers/spi/spi-airoha-snfi.c
> @@ -727,8 +727,9 @@ static ssize_t airoha_snand_dirmap_read(struct spi_mem_dirmap_desc *desc,
>  	if (err)
>  		goto error_dma_unmap;
>  
> -	/* set read addr */
> -	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_RD_CTL3, 0x0);
> +	/* set read addr: zero page offset + descriptor read offset */
> +	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_RD_CTL3,
> +			   desc->info.offset);
>  	if (err)
>  		goto error_dma_unmap;
>  
> @@ -872,7 +873,9 @@ static ssize_t airoha_snand_dirmap_write(struct spi_mem_dirmap_desc *desc,
>  	if (err)
>  		goto error_dma_unmap;
>  
> -	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_PG_CTL2, 0x0);
> +	/* set write addr: zero page offset + descriptor write offset */
> +	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_PG_CTL2,
> +			   desc->info.offset);
>  	if (err)
>  		goto error_dma_unmap;
>  
> -- 
> 2.50.1
> 

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