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spi: bcm63xx-hsspi: Disable spi mem dual io read op support 

In general the controller supports SPI dual mode operation but the
particular SPI flash dual io read op switches from single mode in cmd
phase to dual mode in address and data phase. This is not compatible
with prepend operation where cmd and address are sent out through the
prepend buffer and they must use same the number of io pins.

This patch disables these SPI flash dual io read ops through the mem_ops
supports_op interface. This makes sure the SPI flash driver selects the
compatible read ops at run time.

Signed-off-by: William Zhang <william.zhang@broadcom.com>
Link: https://lore.kernel.org/r/20230209200246.141520-14-william.zhang@broadcom.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
William Zhang 2023-02-09 12:02:44 -08:00 committed by Mark Brown
parent 76a85704cb
commit c6182a187b
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 23 additions and 0 deletions
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23
drivers/spi/spi-bcm63xx-hsspi.c
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@ -20,6 +20,8 @@
#include <linux/spi/spi.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/spi/spi-mem.h>
#include <linux/mtd/spi-nor.h>
#include <linux/reset.h>
#include <linux/pm_runtime.h>
@ -682,6 +684,26 @@ static int bcm63xx_hsspi_transfer_one(struct spi_master *master,
return 0;
}
static bool bcm63xx_hsspi_mem_supports_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
if (!spi_mem_default_supports_op(mem, op))
return false;
/* Controller doesn't support spi mem dual io mode */
if ((op->cmd.opcode == SPINOR_OP_READ_1_2_2) ||
(op->cmd.opcode == SPINOR_OP_READ_1_2_2_4B) ||
(op->cmd.opcode == SPINOR_OP_READ_1_2_2_DTR) ||
(op->cmd.opcode == SPINOR_OP_READ_1_2_2_DTR_4B))
return false;
return true;
}
static const struct spi_controller_mem_ops bcm63xx_hsspi_mem_ops = {
.supports_op = bcm63xx_hsspi_mem_supports_op,
};
static irqreturn_t bcm63xx_hsspi_interrupt(int irq, void *dev_id)
{
struct bcm63xx_hsspi *bs = (struct bcm63xx_hsspi *)dev_id;
@ -779,6 +801,7 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
mutex_init(&bs->msg_mutex);
init_completion(&bs->done);
master->mem_ops = &bcm63xx_hsspi_mem_ops;
master->dev.of_node = dev->of_node;
if (!dev->of_node)
master->bus_num = HSSPI_BUS_NUM;