[v2,1/2] spi: tegra20-slink: Improve runtime PM usage

Commit Message

Dmitry Osipenko July 31, 2021, 7:27 p.m. UTC

The Tegra SPI driver supports runtime PM, which controls the clock
enable state, but the clk is also enabled separately from the RPM
at the driver probe time, and thus, stays always on. Fix it.

Runtime PM now is always available on Tegra, hence there is no need to
check the RPM presence in the driver anymore. Remove these checks.

Signed-off-by: Dmitry Osipenko <[e-mail]>
---

Changelog:

v2: - No changes.

 drivers/spi/spi-tegra20-slink.c | 73 +++++++++++----------------------
 1 file changed, 25 insertions(+), 48 deletions(-)

Comments

Mark Brown Aug. 9, 2021, 1:06 p.m. UTC | #1

On Sat, 31 Jul 2021 22:27:30 +0300, Dmitry Osipenko wrote:
> The Tegra SPI driver supports runtime PM, which controls the clock
> enable state, but the clk is also enabled separately from the RPM
> at the driver probe time, and thus, stays always on. Fix it.
> 
> Runtime PM now is always available on Tegra, hence there is no need to
> check the RPM presence in the driver anymore. Remove these checks.
> 
> [...]

Applied to

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

Thanks!

[1/2] spi: tegra20-slink: Improve runtime PM usage
      commit: e4bb903fda0e9bbafa1338dcd2ee5e4d3ccc50da
[2/2] spi: tegra20-slink: Don't use resource-managed spi_register helper
      commit: 26c863418221344b1cfb8e6c11116b2b81144281

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

Patch

diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index 6a726c95ac7a..501eca1d0f89 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -1061,33 +1061,12 @@  static int tegra_slink_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "Can not get clock %d\n", ret);
 		goto exit_free_master;
 	}
-	ret = clk_prepare(tspi->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "Clock prepare failed %d\n", ret);
-		goto exit_free_master;
-	}
-	ret = clk_enable(tspi->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "Clock enable failed %d\n", ret);
-		goto exit_clk_unprepare;
-	}
-
-	spi_irq = platform_get_irq(pdev, 0);
-	tspi->irq = spi_irq;
-	ret = request_threaded_irq(tspi->irq, tegra_slink_isr,
-			tegra_slink_isr_thread, IRQF_ONESHOT,
-			dev_name(&pdev->dev), tspi);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
-					tspi->irq);
-		goto exit_clk_disable;
-	}
 
 	tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi");
 	if (IS_ERR(tspi->rst)) {
 		dev_err(&pdev->dev, "can not get reset\n");
 		ret = PTR_ERR(tspi->rst);
-		goto exit_free_irq;
+		goto exit_free_master;
 	}
 
 	tspi->max_buf_size = SLINK_FIFO_DEPTH << 2;
@@ -1095,7 +1074,7 @@  static int tegra_slink_probe(struct platform_device *pdev)
 
 	ret = tegra_slink_init_dma_param(tspi, true);
 	if (ret < 0)
-		goto exit_free_irq;
+		goto exit_free_master;
 	ret = tegra_slink_init_dma_param(tspi, false);
 	if (ret < 0)
 		goto exit_rx_dma_free;
@@ -1106,16 +1085,9 @@  static int tegra_slink_probe(struct platform_device *pdev)
 	init_completion(&tspi->xfer_completion);
 
 	pm_runtime_enable(&pdev->dev);
-	if (!pm_runtime_enabled(&pdev->dev)) {
-		ret = tegra_slink_runtime_resume(&pdev->dev);
-		if (ret)
-			goto exit_pm_disable;
-	}
-
-	ret = pm_runtime_get_sync(&pdev->dev);
-	if (ret < 0) {
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret) {
 		dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret);
-		pm_runtime_put_noidle(&pdev->dev);
 		goto exit_pm_disable;
 	}
 
@@ -1123,33 +1095,43 @@  static int tegra_slink_probe(struct platform_device *pdev)
 	udelay(2);
 	reset_control_deassert(tspi->rst);
 
+	spi_irq = platform_get_irq(pdev, 0);
+	tspi->irq = spi_irq;
+	ret = request_threaded_irq(tspi->irq, tegra_slink_isr,
+				   tegra_slink_isr_thread, IRQF_ONESHOT,
+				   dev_name(&pdev->dev), tspi);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
+			tspi->irq);
+		goto exit_pm_put;
+	}
+
 	tspi->def_command_reg  = SLINK_M_S;
 	tspi->def_command2_reg = SLINK_CS_ACTIVE_BETWEEN;
 	tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND);
 	tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2);
-	pm_runtime_put(&pdev->dev);
 
 	master->dev.of_node = pdev->dev.of_node;
 	ret = devm_spi_register_master(&pdev->dev, master);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "can not register to master err %d\n", ret);
-		goto exit_pm_disable;
+		goto exit_free_irq;
 	}
+
+	pm_runtime_put(&pdev->dev);
+
 	return ret;
 
+exit_free_irq:
+	free_irq(spi_irq, tspi);
+exit_pm_put:
+	pm_runtime_put(&pdev->dev);
 exit_pm_disable:
 	pm_runtime_disable(&pdev->dev);
-	if (!pm_runtime_status_suspended(&pdev->dev))
-		tegra_slink_runtime_suspend(&pdev->dev);
+
 	tegra_slink_deinit_dma_param(tspi, false);
 exit_rx_dma_free:
 	tegra_slink_deinit_dma_param(tspi, true);
-exit_free_irq:
-	free_irq(spi_irq, tspi);
-exit_clk_disable:
-	clk_disable(tspi->clk);
-exit_clk_unprepare:
-	clk_unprepare(tspi->clk);
 exit_free_master:
 	spi_master_put(master);
 	return ret;
@@ -1162,8 +1144,7 @@  static int tegra_slink_remove(struct platform_device *pdev)
 
 	free_irq(tspi->irq, tspi);
 
-	clk_disable(tspi->clk);
-	clk_unprepare(tspi->clk);
+	pm_runtime_disable(&pdev->dev);
 
 	if (tspi->tx_dma_chan)
 		tegra_slink_deinit_dma_param(tspi, false);
@@ -1171,10 +1152,6 @@  static int tegra_slink_remove(struct platform_device *pdev)
 	if (tspi->rx_dma_chan)
 		tegra_slink_deinit_dma_param(tspi, true);
 
-	pm_runtime_disable(&pdev->dev);
-	if (!pm_runtime_status_suspended(&pdev->dev))
-		tegra_slink_runtime_suspend(&pdev->dev);
-
 	return 0;
 }