[ Upstream commit f6ed6491d565c336a360471e0c29228e34f4380e ]
adma driver is using pm_clk_*() interface for managing clock resources. With this it is observed that clocks remain ON always. This happens on Tegra devices which use BPMP co-processor to manage clock resources, where clocks are enabled during prepare phase. This is necessary because clocks to BPMP are always blocking. When pm_clk_*() interface is used on such Tegra devices, clock prepare count is not balanced till remove call happens for the driver and hence clocks are seen ON always. Thus this patch replaces pm_clk_*() with devm_clk_*() framework.
Suggested-by: Mohan Kumar D mkumard@nvidia.com Reviewed-by: Jonathan Hunter jonathanh@nvidia.com Signed-off-by: Sameer Pujar spujar@nvidia.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/tegra210-adma.c | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-)
diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c index af3487538c191..e9e46a5207452 100644 --- a/drivers/dma/tegra210-adma.c +++ b/drivers/dma/tegra210-adma.c @@ -22,7 +22,6 @@ #include <linux/of_device.h> #include <linux/of_dma.h> #include <linux/of_irq.h> -#include <linux/pm_clock.h> #include <linux/pm_runtime.h> #include <linux/slab.h>
@@ -141,6 +140,7 @@ struct tegra_adma { struct dma_device dma_dev; struct device *dev; void __iomem *base_addr; + struct clk *ahub_clk; unsigned int nr_channels; unsigned long rx_requests_reserved; unsigned long tx_requests_reserved; @@ -637,8 +637,9 @@ static int tegra_adma_runtime_suspend(struct device *dev) struct tegra_adma *tdma = dev_get_drvdata(dev);
tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD); + clk_disable_unprepare(tdma->ahub_clk);
- return pm_clk_suspend(dev); + return 0; }
static int tegra_adma_runtime_resume(struct device *dev) @@ -646,10 +647,11 @@ static int tegra_adma_runtime_resume(struct device *dev) struct tegra_adma *tdma = dev_get_drvdata(dev); int ret;
- ret = pm_clk_resume(dev); - if (ret) + ret = clk_prepare_enable(tdma->ahub_clk); + if (ret) { + dev_err(dev, "ahub clk_enable failed: %d\n", ret); return ret; - + } tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
return 0; @@ -692,13 +694,11 @@ static int tegra_adma_probe(struct platform_device *pdev) if (IS_ERR(tdma->base_addr)) return PTR_ERR(tdma->base_addr);
- ret = pm_clk_create(&pdev->dev); - if (ret) - return ret; - - ret = of_pm_clk_add_clk(&pdev->dev, "d_audio"); - if (ret) - goto clk_destroy; + tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio"); + if (IS_ERR(tdma->ahub_clk)) { + dev_err(&pdev->dev, "Error: Missing ahub controller clock\n"); + return PTR_ERR(tdma->ahub_clk); + }
pm_runtime_enable(&pdev->dev);
@@ -775,8 +775,6 @@ static int tegra_adma_probe(struct platform_device *pdev) pm_runtime_put_sync(&pdev->dev); rpm_disable: pm_runtime_disable(&pdev->dev); -clk_destroy: - pm_clk_destroy(&pdev->dev);
return ret; } @@ -794,7 +792,6 @@ static int tegra_adma_remove(struct platform_device *pdev)
pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); - pm_clk_destroy(&pdev->dev);
return 0; }