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spi: spi-cadence-qspi: Disable STIG mode for Altera SoCFPGA.

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STIG mode is enabled by default for less than 8 bytes data read/write.
STIG mode doesn't work with Altera SocFPGA platform due hardware
limitation.
Add a quirks to disable STIG mode for Altera SoCFPGA platform.

Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@intel.com>
Link: https://patch.msgid.link/20241204063338.296959-1-niravkumar.l.rabara@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Niravkumar L Rabara 2024-12-04 14:33:38 +08:00 committed by Mark Brown
parent 0bb394067a
commit 25fb0e77b9
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GPG Key ID: 24D68B725D5487D0
1 changed files with 8 additions and 2 deletions
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10
drivers/spi/spi-cadence-quadspi.c
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@ -43,6 +43,7 @@ static_assert(CQSPI_MAX_CHIPSELECT <= SPI_CS_CNT_MAX);
#define CQSPI_SLOW_SRAM BIT(4)
#define CQSPI_NEEDS_APB_AHB_HAZARD_WAR BIT(5)
#define CQSPI_RD_NO_IRQ BIT(6)
#define CQSPI_DISABLE_STIG_MODE BIT(7)
/* Capabilities */
#define CQSPI_SUPPORTS_OCTAL BIT(0)
@ -103,6 +104,7 @@ struct cqspi_st {
bool apb_ahb_hazard;
bool is_jh7110; /* Flag for StarFive JH7110 SoC */
bool disable_stig_mode;
const struct cqspi_driver_platdata *ddata;
};
@ -1416,7 +1418,8 @@ static int cqspi_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
* reads, prefer STIG mode for such small reads.
*/
if (!op->addr.nbytes ||
op->data.nbytes <= CQSPI_STIG_DATA_LEN_MAX)
(op->data.nbytes <= CQSPI_STIG_DATA_LEN_MAX &&
!cqspi->disable_stig_mode))
return cqspi_command_read(f_pdata, op);
return cqspi_read(f_pdata, op);
@ -1880,6 +1883,8 @@ static int cqspi_probe(struct platform_device *pdev)
if (ret)
goto probe_reset_failed;
}
if (ddata->quirks & CQSPI_DISABLE_STIG_MODE)
cqspi->disable_stig_mode = true;
if (of_device_is_compatible(pdev->dev.of_node,
"xlnx,versal-ospi-1.0")) {
@ -2043,7 +2048,8 @@ static const struct cqspi_driver_platdata intel_lgm_qspi = {
static const struct cqspi_driver_platdata socfpga_qspi = {
.quirks = CQSPI_DISABLE_DAC_MODE
| CQSPI_NO_SUPPORT_WR_COMPLETION
| CQSPI_SLOW_SRAM,
| CQSPI_SLOW_SRAM
| CQSPI_DISABLE_STIG_MODE,
};
static const struct cqspi_driver_platdata versal_ospi = {