spi: airoha: fix reading/writing of flashes with more than one plane per lun

[ Upstream commit 0b7d9b2 ]

Attaching UBI on the flash with more than one plane per lun will lead to
the following error:

[    2.980989] spi-nand spi0.0: Micron SPI NAND was found.
[    2.986309] spi-nand spi0.0: 256 MiB, block size: 128 KiB, page size: 2048, OOB size: 128
[    2.994978] 2 fixed-partitions partitions found on MTD device spi0.0
[    3.001350] Creating 2 MTD partitions on "spi0.0":
[    3.006159] 0x000000000000-0x000000020000 : "bl2"
[    3.011663] 0x000000020000-0x000010000000 : "ubi"
...
[    6.391748] ubi0: attaching mtd1
[    6.412545] ubi0 error: ubi_attach: PEB 0 contains corrupted VID header, and the data does not contain all 0xFF
[    6.422677] ubi0 error: ubi_attach: this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection
[    6.434249] Volume identifier header dump:
[    6.438349]     magic     55424923
[    6.441482]     version   1
[    6.444007]     vol_type  0
[    6.446539]     copy_flag 0
[    6.449068]     compat    0
[    6.451594]     vol_id    0
[    6.454120]     lnum      1
[    6.456651]     data_size 4096
[    6.459442]     used_ebs  1061644134
[    6.462748]     data_pad  0
[    6.465274]     sqnum     0
[    6.467805]     hdr_crc   61169820
[    6.470943] Volume identifier header hexdump:
[    6.475308] hexdump of PEB 0 offset 4096, length 126976
[    6.507391] ubi0 warning: ubi_attach: valid VID header but corrupted EC header at PEB 4
[    6.515415] ubi0 error: ubi_compare_lebs: unsupported on-flash UBI format
[    6.522222] ubi0 error: ubi_attach_mtd_dev: failed to attach mtd1, error -22
[    6.529294] UBI error: cannot attach mtd1

Non dirmap reading works good. 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 the address
passed to the flash should take in the account the value of
desc->info.offset.

This patch fix dirmap reading/writing of flashes with more than one
plane per lun.

Fixes: a403997 ("spi: airoha: add SPI-NAND Flash controller driver")
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20251012121707.2296160-7-mikhail.kshevetskiy@iopsys.eu
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: mkshevetskiy

drivers/spi/spi-airoha-snfi.c

@@ -733,8 +733,9 @@ 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;
 
@@ -870,7 +871,9 @@ 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;