1 files changed, 80 insertions, 5 deletions

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index bee8fc4c9f07..d8703d7dfd0a 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -1184,6 +1184,8 @@ spi_nor_find_best_erase_type(const struct spi_nor_erase_map *map,
 			continue;
 
 		erase = &map->erase_type[i];
+		if (!erase->size)
+			continue;
 
 		/* Alignment is not mandatory for overlaid regions */
 		if (region->offset & SNOR_OVERLAID_REGION &&
@@ -1632,6 +1634,16 @@ static const struct spi_nor_manufacturer *manufacturers[] = {
 	&spi_nor_xmc,
 };
 
+static const struct flash_info spi_nor_generic_flash = {
+	.name = "spi-nor-generic",
+	/*
+	 * JESD216 rev A doesn't specify the page size, therefore we need a
+	 * sane default.
+	 */
+	.page_size = 256,
+	.parse_sfdp = true,
+};
+
 static const struct flash_info *spi_nor_match_id(struct spi_nor *nor,
 						 const u8 *id)
 {
@@ -1664,7 +1676,20 @@ static const struct flash_info *spi_nor_detect(struct spi_nor *nor)
 		return ERR_PTR(ret);
 	}
 
+	/* Cache the complete flash ID. */
+	nor->id = devm_kmemdup(nor->dev, id, SPI_NOR_MAX_ID_LEN, GFP_KERNEL);
+	if (!nor->id)
+		return ERR_PTR(-ENOMEM);
+
 	info = spi_nor_match_id(nor, id);
+
+	/* Fallback to a generic flash described only by its SFDP data. */
+	if (!info) {
+		ret = spi_nor_check_sfdp_signature(nor);
+		if (!ret)
+			info = &spi_nor_generic_flash;
+	}
+
 	if (!info) {
 		dev_err(nor->dev, "unrecognized JEDEC id bytes: %*ph\n",
 			SPI_NOR_MAX_ID_LEN, id);
@@ -1914,7 +1939,8 @@ static int spi_nor_spimem_check_readop(struct spi_nor *nor,
 	spi_nor_spimem_setup_op(nor, &op, read->proto);
 
 	/* convert the dummy cycles to the number of bytes */
-	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
+	op.dummy.nbytes = (read->num_mode_clocks + read->num_wait_states) *
+			  op.dummy.buswidth / 8;
 	if (spi_nor_protocol_is_dtr(nor->read_proto))
 		op.dummy.nbytes *= 2;
 
@@ -2091,8 +2117,12 @@ static int spi_nor_select_pp(struct spi_nor *nor,
  * spi_nor_select_uniform_erase() - select optimum uniform erase type
  * @map:		the erase map of the SPI NOR
  * @wanted_size:	the erase type size to search for. Contains the value of
- *			info->sector_size or of the "small sector" size in case
- *			CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is defined.
+ *			info->sector_size, the "small sector" size in case
+ *			CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is defined or 0 if
+ *			there is no information about the sector size. The
+ *			latter is the case if the flash parameters are parsed
+ *			solely by SFDP, then the largest supported erase type
+ *			is selected.
  *
  * Once the optimum uniform sector erase command is found, disable all the
  * other.
@@ -2113,6 +2143,10 @@ spi_nor_select_uniform_erase(struct spi_nor_erase_map *map,
 
 		tested_erase = &map->erase_type[i];
 
+		/* Skip masked erase types. */
+		if (!tested_erase->size)
+			continue;
+
 		/*
 		 * If the current erase size is the one, stop here:
 		 * we have found the right uniform Sector Erase command.
@@ -2565,6 +2599,12 @@ static void spi_nor_init_default_params(struct spi_nor *nor)
 	params->hwcaps.mask |= SNOR_HWCAPS_PP;
 	spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
 				SPINOR_OP_PP, SNOR_PROTO_1_1_1);
+
+	if (info->flags & SPI_NOR_QUAD_PP) {
+		params->hwcaps.mask |= SNOR_HWCAPS_PP_1_1_4;
+		spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP_1_1_4],
+					SPINOR_OP_PP_1_1_4, SNOR_PROTO_1_1_4);
+	}
 }
 
 /**
@@ -2840,10 +2880,20 @@ static void spi_nor_put_device(struct mtd_info *mtd)
 
 void spi_nor_restore(struct spi_nor *nor)
 {
+	int ret;
+
 	/* restore the addressing mode */
 	if (nor->addr_nbytes == 4 && !(nor->flags & SNOR_F_4B_OPCODES) &&
-	    nor->flags & SNOR_F_BROKEN_RESET)
-		nor->params->set_4byte_addr_mode(nor, false);
+	    nor->flags & SNOR_F_BROKEN_RESET) {
+		ret = nor->params->set_4byte_addr_mode(nor, false);
+		if (ret)
+			/*
+			 * Do not stop the execution in the hope that the flash
+			 * will default to the 3-byte address mode after the
+			 * software reset.
+			 */
+			dev_err(nor->dev, "Failed to exit 4-byte address mode, err = %d\n", ret);
+	}
 
 	if (nor->flags & SNOR_F_SOFT_RESET)
 		spi_nor_soft_reset(nor);
@@ -2935,6 +2985,27 @@ static void spi_nor_set_mtd_info(struct spi_nor *nor)
 	mtd->_put_device = spi_nor_put_device;
 }
 
+static int spi_nor_hw_reset(struct spi_nor *nor)
+{
+	struct gpio_desc *reset;
+
+	reset = devm_gpiod_get_optional(nor->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR_OR_NULL(reset))
+		return PTR_ERR_OR_ZERO(reset);
+
+	/*
+	 * Experimental delay values by looking at different flash device
+	 * vendors datasheets.
+	 */
+	usleep_range(1, 5);
+	gpiod_set_value_cansleep(reset, 1);
+	usleep_range(100, 150);
+	gpiod_set_value_cansleep(reset, 0);
+	usleep_range(1000, 1200);
+
+	return 0;
+}
+
 int spi_nor_scan(struct spi_nor *nor, const char *name,
 		 const struct spi_nor_hwcaps *hwcaps)
 {
@@ -2967,6 +3038,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (!nor->bouncebuf)
 		return -ENOMEM;
 
+	ret = spi_nor_hw_reset(nor);
+	if (ret)
+		return ret;
+
 	info = spi_nor_get_flash_info(nor, name);
 	if (IS_ERR(info))
 		return PTR_ERR(info);