spi: intel: Keep the BIOS partition inside the first chip

If there are two flash chips connected flash regions can refer to the
second chip too. In this case we may see the following warning:

  mtd: partition "BIOS" extends beyond the end of device "0000:00:1f.5" --
  	size truncated to 0x400000

For this reason, check the BIOS partition size against the chip size and
make sure it stays within the that.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20240201121638.207632-2-mika.westerberg@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: westeri

drivers/spi/spi-intel.c

@@ -1254,6 +1254,13 @@ static void intel_spi_fill_partition(struct intel_spi *ispi,
 		if (end > part->size)
 			part->size = end;
 	}
+
+	/*
+	 * Regions can refer to the second chip too so in this case we
+	 * just make the BIOS partition to occupy the whole chip.
+	 */
+	if (ispi->chip0_size && part->size > ispi->chip0_size)
+		part->size = MTDPART_SIZ_FULL;
 }
 
 static int intel_spi_read_desc(struct intel_spi *ispi)
@@ -1350,6 +1357,10 @@ static int intel_spi_populate_chip(struct intel_spi *ispi)
 	struct spi_board_info chip;
 	int ret;
 
+	ret = intel_spi_read_desc(ispi);
+	if (ret)
+		return ret;
+
 	pdata = devm_kzalloc(ispi->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;
@@ -1369,10 +1380,6 @@ static int intel_spi_populate_chip(struct intel_spi *ispi)
 	if (!spi_new_device(ispi->host, &chip))
 		return -ENODEV;
 
-	ret = intel_spi_read_desc(ispi);
-	if (ret)
-		return ret;
-
 	/* Add the second chip if present */
 	if (ispi->host->num_chipselect < 2)
 		return 0;