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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mtd/spi-nor/core.c
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@@ -855,21 +855,22 @@
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 		ret = spi_nor_read_cr(nor, &sr_cr[1]);
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 		if (ret)
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 			return ret;
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-	} else if (nor->params->quad_enable) {
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+	} else if (spi_nor_get_protocol_width(nor->read_proto) == 4 &&
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+		   spi_nor_get_protocol_width(nor->write_proto) == 4 &&
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+		   nor->params->quad_enable) {
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 		/*
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 		 * If the Status Register 2 Read command (35h) is not
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 		 * supported, we should at least be sure we don't
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 		 * change the value of the SR2 Quad Enable bit.
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 		 *
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-		 * We can safely assume that when the Quad Enable method is
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-		 * set, the value of the QE bit is one, as a consequence of the
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-		 * nor->params->quad_enable() call.
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+		 * When the Quad Enable method is set and the buswidth is 4, we
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+		 * can safely assume that the value of the QE bit is one, as a
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+		 * consequence of the nor->params->quad_enable() call.
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 		 *
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-		 * We can safely assume that the Quad Enable bit is present in
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-		 * the Status Register 2 at BIT(1). According to the JESD216
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-		 * revB standard, BFPT DWORDS[15], bits 22:20, the 16-bit
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-		 * Write Status (01h) command is available just for the cases
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-		 * in which the QE bit is described in SR2 at BIT(1).
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+		 * According to the JESD216 revB standard, BFPT DWORDS[15],
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+		 * bits 22:20, the 16-bit Write Status (01h) command is
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+		 * available just for the cases in which the QE bit is
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+		 * described in SR2 at BIT(1).
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 		 */
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 		sr_cr[1] = SR2_QUAD_EN_BIT1;
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 	} else {
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@@ -1314,6 +1315,8 @@
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 			continue;
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 		erase = &map->erase_type[i];
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+		if (!erase->size)
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+			continue;
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 		/* Alignment is not mandatory for overlaid regions */
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 		if (region->offset & SNOR_OVERLAID_REGION &&
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@@ -2566,6 +2569,15 @@
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 }
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 /**
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+ * spi_nor_mask_erase_type() - mask out a SPI NOR erase type
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+ * @erase:	pointer to a structure that describes a SPI NOR erase type
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+ */
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+void spi_nor_mask_erase_type(struct spi_nor_erase_type *erase)
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+{
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+	erase->size = 0;
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+}
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+
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+/**
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  * spi_nor_init_uniform_erase_map() - Initialize uniform erase map
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  * @map:		the erase map of the SPI NOR
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  * @erase_mask:		bitmask encoding erase types that can erase the entire