[PATCH] Fixes in TI QSPI driver to allow more than one flash chip

From: Kwiatkowski, Arkadiusz
Date: Thu Mar 22 2018 - 09:08:06 EST


Add checking for which SPI device was memory-mapped to allow more than
one flash device being used on QSPI bus. Fix parameters order in
regmap_update_bits calls.

Signed-off-by: Arkadiusz Kwiatkowski <arkadiusz.kwiatkowski@xxxxxxxxx>
---
drivers/spi/spi-ti-qspi.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index c24d9b4..3d1dc4f 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -66,7 +66,7 @@ struct ti_qspi {
u32 cmd;
u32 dc;

-bool mmap_enabled;
+struct spi_device*mmap_spi_device;
};

#define QSPI_PID(0x0)
@@ -490,10 +490,10 @@ static void ti_qspi_enable_memory_map(struct spi_device *spi)
ti_qspi_write(qspi, MM_SWITCH, QSPI_SPI_SWITCH_REG);
if (qspi->ctrl_base) {
regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg,
- MEM_CS_EN(spi->chip_select),
- MEM_CS_MASK);
+ MEM_CS_MASK,
+ MEM_CS_EN(spi->chip_select));
}
-qspi->mmap_enabled = true;
+qspi->mmap_spi_device = spi;
}

static void ti_qspi_disable_memory_map(struct spi_device *spi)
@@ -503,8 +503,8 @@ static void ti_qspi_disable_memory_map(struct spi_device *spi)
ti_qspi_write(qspi, 0, QSPI_SPI_SWITCH_REG);
if (qspi->ctrl_base)
regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg,
- 0, MEM_CS_MASK);
-qspi->mmap_enabled = false;
+ MEM_CS_MASK, 0);
+qspi->mmap_spi_device = NULL;
}

static void ti_qspi_setup_mmap_read(struct spi_device *spi,
@@ -544,8 +544,12 @@ static int ti_qspi_spi_flash_read(struct spi_device *spi,

mutex_lock(&qspi->list_lock);

-if (!qspi->mmap_enabled)
+if (qspi->mmap_spi_device != spi) {
+if (qspi->mmap_spi_device != NULL)
+ti_qspi_disable_memory_map(qspi->mmap_spi_device);
ti_qspi_enable_memory_map(spi);
+}
+
ti_qspi_setup_mmap_read(spi, msg);

if (qspi->rx_chan) {
@@ -600,7 +604,7 @@ static int ti_qspi_start_transfer_one(struct spi_master *master,

mutex_lock(&qspi->list_lock);

-if (qspi->mmap_enabled)
+if (qspi->mmap_spi_device != NULL)
ti_qspi_disable_memory_map(spi);

list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -787,7 +791,7 @@ static int ti_qspi_probe(struct platform_device *pdev)
master->spi_flash_read = NULL;
}
}
-qspi->mmap_enabled = false;
+qspi->mmap_spi_device = NULL;

ret = devm_spi_register_master(&pdev->dev, master);
if (!ret)
--
2.7.4
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