Enable the SPI_TX_QUAD mode bit in the host->mode_bits to support
data transmission over four lines to improve the performance.

Tested the functionality on AM62Lx EVM (W25N01JW) in 1S-4S-4S mode.

Signed-off-by: Santhosh Kumar K <s-k6@ti.com>
---

Repo: https://github.com/santhosh21/linux/tree/uL_next
Test results: https://gist.github.com/santhosh21/71ab6646dccc238a0b3c47c0382f219a

Regards,
Santhosh.

 drivers/spi/spi-cadence-quadspi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index 47477f2d9a25..594408d53400 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -49,6 +49,7 @@ static_assert(CQSPI_MAX_CHIPSELECT <= SPI_CS_CNT_MAX);
 
 /* Capabilities */
 #define CQSPI_SUPPORTS_OCTAL		BIT(0)
+#define CQSPI_SUPPORTS_QUAD		BIT(1)
 
 #define CQSPI_OP_WIDTH(part) ((part).nbytes ? ilog2((part).buswidth) : 0)
 
@@ -1888,6 +1889,8 @@ static int cqspi_probe(struct platform_device *pdev)
 						cqspi->master_ref_clk_hz);
 		if (ddata->hwcaps_mask & CQSPI_SUPPORTS_OCTAL)
 			host->mode_bits |= SPI_RX_OCTAL | SPI_TX_OCTAL;
+		if (ddata->hwcaps_mask & CQSPI_SUPPORTS_QUAD)
+			host->mode_bits |= SPI_TX_QUAD;
 		if (!(ddata->quirks & CQSPI_DISABLE_DAC_MODE)) {
 			cqspi->use_direct_mode = true;
 			cqspi->use_direct_mode_wr = true;
@@ -2062,7 +2065,7 @@ static const struct cqspi_driver_platdata k2g_qspi = {
 };
 
 static const struct cqspi_driver_platdata am654_ospi = {
-	.hwcaps_mask = CQSPI_SUPPORTS_OCTAL,
+	.hwcaps_mask = CQSPI_SUPPORTS_OCTAL | CQSPI_SUPPORTS_QUAD,
 	.quirks = CQSPI_NEEDS_WR_DELAY,
 };
 
-- 
2.34.1

On Thu, 02 Jan 2025 17:35:44 +0530, Santhosh Kumar K wrote:
> Enable the SPI_TX_QUAD mode bit in the host->mode_bits to support
> data transmission over four lines to improve the performance.
> 
> Tested the functionality on AM62Lx EVM (W25N01JW) in 1S-4S-4S mode.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: cadence-quadspi: Enable SPI_TX_QUAD
      commit: 1e293574c6f5d5d87acd7d64415eae055d0672e7

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark