[PATCH v2 07/30] spi: mtd: Use split reads if multi-die flag is set

[Tejas Bhumkar]

From: T Karthik Reddy <t.karthik.reddy at xilinx.com>

Some flash devices have multiple dies in it & has die cross over
issue. When SPI_NOR_MULTI_DIE flag is set in flash id table use
it to enable split reads to avoid above issue. Define SPI_NOR_MULTI_DIE
new flag to flash id flags. Remove SPI_FLASH_SPLIT_READ config and
related code from the zynq and zynqmp qspi drivers as it is redundant.

Signed-off-by: T Karthik Reddy <t.karthik.reddy at xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at xilinx.com>
Signed-off-by: Tejas Bhumkar <tejas.arvind.bhumkar at amd.com>
---
 drivers/mtd/spi/sf_internal.h  | 1 +
 drivers/mtd/spi/spi-nor-core.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index 9c09f97ce2..2cbdea60b0 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -70,6 +70,7 @@ struct flash_info {
 #define SPI_NOR_OCTAL_READ	BIT(16)	/* Flash supports Octal Read */
 #define SPI_NOR_OCTAL_DTR_READ	BIT(17)	/* Flash supports Octal DTR Read */
 #define SPI_NOR_OCTAL_DTR_PP	BIT(18) /* Flash supports Octal DTR page program */
+#define SPI_NOR_MULTI_DIE	BIT(19) /* Flash has multi dies & need split reads*/
 };
 
 extern const struct flash_info spi_nor_ids[];
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 63f78baaf4..ace5da9591 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -4485,6 +4485,9 @@ int spi_nor_scan(struct spi_nor *nor)
 	if (info->flags & SPI_NOR_NO_ERASE)
 		mtd->flags |= MTD_NO_ERASE;
 
+	if (info->flags & SPI_NOR_MULTI_DIE)
+		nor->spi->multi_die = true;
+
 	nor->page_size = params.page_size;
 	mtd->writebufsize = nor->page_size;
 
-- 
2.27.0