[PATCH 1/1] spi: spi-cadence: Enable spi refclk in slave mode

[PATCH 1/1] spi: spi-cadence: Enable spi refclk in slave mode

[Amit Kumar Mahapatra]

When spi-cadence is configured as a slave, it requires the SPI refclk to
detect the synchronization start condition while communicating with the
master. However, the spi-cadence driver never enables the SPI refclk in
slave mode, causing the refclk to remain disabled if the
"clk_ignore_unused" kernel parameter is not passed through bootargs.
As a result, the slave cannot detect data sent by the master, leading to
communication failure. Update driver to enable the SPI refclk in both
master and slave configurations.

Fixes: b1b90514eaa3 ("spi: spi-cadence: Add support for Slave mode")
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@amd.com>
---
BRANCH: for-next
---
 drivers/spi/spi-cadence.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c
index 4eacf3f6e031..e07e081de5ea 100644
--- a/drivers/spi/spi-cadence.c
+++ b/drivers/spi/spi-cadence.c
@@ -601,14 +601,14 @@ static int cdns_spi_probe(struct platform_device *pdev)
 	reset_control_assert(xspi->rstc);
 	reset_control_deassert(xspi->rstc);
 
-	if (!spi_controller_is_target(ctlr)) {
-		xspi->ref_clk = devm_clk_get_enabled(&pdev->dev, "ref_clk");
-		if (IS_ERR(xspi->ref_clk)) {
-			dev_err(&pdev->dev, "ref_clk clock not found.\n");
-			ret = PTR_ERR(xspi->ref_clk);
-			goto remove_ctlr;
-		}
+	xspi->ref_clk = devm_clk_get_enabled(&pdev->dev, "ref_clk");
+	if (IS_ERR(xspi->ref_clk)) {
+		dev_err(&pdev->dev, "ref_clk clock not found.\n");
+		ret = PTR_ERR(xspi->ref_clk);
+		goto remove_ctlr;
+	}
 
+	if (!spi_controller_is_target(ctlr)) {
 		pm_runtime_use_autosuspend(&pdev->dev);
 		pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
 		pm_runtime_get_noresume(&pdev->dev);
-- 
2.17.1

Re: [PATCH 1/1] spi: spi-cadence: Enable spi refclk in slave mode

[Mark Brown]

On Mon, 17 Jun 2024 21:08:37 +0530, Amit Kumar Mahapatra wrote:
> When spi-cadence is configured as a slave, it requires the SPI refclk to
> detect the synchronization start condition while communicating with the
> master. However, the spi-cadence driver never enables the SPI refclk in
> slave mode, causing the refclk to remain disabled if the
> "clk_ignore_unused" kernel parameter is not passed through bootargs.
> As a result, the slave cannot detect data sent by the master, leading to
> communication failure. Update driver to enable the SPI refclk in both
> master and slave configurations.
> 
> [...]

Applied to

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

Thanks!

[1/1] spi: spi-cadence: Enable spi refclk in slave mode
      commit: 78b05172b42d14a4c6fc6b75b31590b8977900dc

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