linux-kernel - [PATCH AUTOSEL 6.12 15/29] spi: spi-cadence-qspi: Disable STIG mode for Altera SoCFPGA.

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Message-Id: <20241220171130.511389-15-sashal@kernel.org>
Date: Fri, 20 Dec 2024 12:11:16 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Niravkumar L Rabara <niravkumar.l.rabara@...el.com>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-spi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 15/29] spi: spi-cadence-qspi: Disable STIG mode for Altera SoCFPGA.

From: Niravkumar L Rabara <niravkumar.l.rabara@...el.com>

[ Upstream commit 25fb0e77b90e290a1ca30900d54c6a495eea65e2 ]

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@...el.com>
Link: https://patch.msgid.link/20241204063338.296959-1-niravkumar.l.rabara@intel.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-cadence-quadspi.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index 1755ca026f08..73b1edd0531b 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -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 = {
-- 
2.39.5