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spi: xilinx: add force_irq for QSPI mode 

Xilinx PG158 page 80 [1] states that master transaction inhibit bit must
be set to properly setup the transaction in QSPI mode. Add the force_irq
flag to follow this sequence.

[1] https://docs.xilinx.com/r/en-US/pg153-axi-quad-spi/Dual/Quad-SPI-Mode-Transactions

Signed-off-by: Vadim Fedorenko <vadfed@meta.com>
Link: https://lore.kernel.org/r/20230214135928.1253205-1-vadfed@meta.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Vadim Fedorenko 2023-02-14 05:59:28 -08:00 committed by Mark Brown
parent e976222544
commit 1dd46599f8
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 8 additions and 2 deletions
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9
drivers/spi/spi-xilinx.c
View File

@ -83,7 +83,7 @@ struct xilinx_spi {
void __iomem *regs; /* virt. address of the control registers */
int irq;
bool force_irq; /* force irq to setup master inhibit */
u8 *rx_ptr; /* pointer in the Tx buffer */
const u8 *tx_ptr; /* pointer in the Rx buffer */
u8 bytes_per_word;
@ -248,7 +248,8 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
xspi->rx_ptr = t->rx_buf;
remaining_words = t->len / xspi->bytes_per_word;
if (xspi->irq >= 0 && remaining_words > xspi->buffer_size) {
if (xspi->irq >= 0 &&
(xspi->force_irq || remaining_words > xspi->buffer_size)) {
u32 isr;
use_irq = true;
/* Inhibit irq to avoid spurious irqs on tx_empty*/
@ -393,6 +394,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
struct resource *res;
int ret, num_cs = 0, bits_per_word;
struct spi_master *master;
bool force_irq = false;
u32 tmp;
u8 i;
@ -400,6 +402,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
if (pdata) {
num_cs = pdata->num_chipselect;
bits_per_word = pdata->bits_per_word;
force_irq = pdata->force_irq;
} else {
of_property_read_u32(pdev->dev.of_node, "xlnx,num-ss-bits",
&num_cs);
@ -477,6 +480,8 @@ static int xilinx_spi_probe(struct platform_device *pdev)
dev_name(&pdev->dev), xspi);
if (ret)
return ret;
xspi->force_irq = force_irq;
}
/* SPI controller initializations */

1
include/linux/spi/xilinx_spi.h
View File

@ -15,6 +15,7 @@ struct xspi_platform_data {
u8 bits_per_word;
struct spi_board_info *devices;
u8 num_devices;
bool force_irq;
};
#endif /* __LINUX_SPI_XILINX_SPI_H */