From 65a5c3dd3e11225a0d0e0df97d23fa64ab2d4ed2 Mon Sep 17 00:00:00 2001
From: Jon Hunter <jonathanh@nvidia.com>
Date: Tue, 6 Jun 2017 13:49:29 +0100
Subject: [PATCH] dmaengine: tegra-apb: Really fix runtime-pm usage
Git-commit: 65a5c3dd3e11225a0d0e0df97d23fa64ab2d4ed2
Patch-mainline: v4.13-rc1
References: bsc#1051510
Commit edd3bdbe9db1 ("dmaengine: tegra-apb: Correct runtime-pm usage")
added pm_runtime_get/put() calls to the tegra-apb DMA system suspend
callbacks. Runtime PM is disabled during system suspend and so these
APIs cannot be used. Fix the suspend handling for the tegra-apb DMA by
moving the save and restore of the DMA register context into the
runtime PM suspend and resume callbacks, and then use the
pm_runtime_force_suspend/resume() APIs to invoke the runtime PM
callbacks during system suspend.
Fixes: edd3bdbe9db1 ("dmaengine: tegra-apb: Correct runtime-pm usage")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/dma/tegra20-apb-dma.c | 50 +++++++----------------------------
1 file changed, 10 insertions(+), 40 deletions(-)
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 3722b9d8d9fe..b9d75a54c896 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1492,37 +1492,9 @@ static int tegra_dma_remove(struct platform_device *pdev)
}
static int tegra_dma_runtime_suspend(struct device *dev)
-{
- struct tegra_dma *tdma = dev_get_drvdata(dev);
-
- clk_disable_unprepare(tdma->dma_clk);
- return 0;
-}
-
-static int tegra_dma_runtime_resume(struct device *dev)
-{
- struct tegra_dma *tdma = dev_get_drvdata(dev);
- int ret;
-
- ret = clk_prepare_enable(tdma->dma_clk);
- if (ret < 0) {
- dev_err(dev, "clk_enable failed: %d\n", ret);
- return ret;
- }
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int tegra_dma_pm_suspend(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
int i;
- int ret;
-
- /* Enable clock before accessing register */
- ret = pm_runtime_get_sync(dev);
- if (ret < 0)
- return ret;
tdma->reg_gen = tdma_read(tdma, TEGRA_APBDMA_GENERAL);
for (i = 0; i < tdma->chip_data->nr_channels; i++) {
@@ -1543,21 +1515,21 @@ static int tegra_dma_pm_suspend(struct device *dev)
TEGRA_APBDMA_CHAN_WCOUNT);
}
- /* Disable clock */
- pm_runtime_put(dev);
+ clk_disable_unprepare(tdma->dma_clk);
+
return 0;
}
-static int tegra_dma_pm_resume(struct device *dev)
+static int tegra_dma_runtime_resume(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
- int i;
- int ret;
+ int i, ret;
- /* Enable clock before accessing register */
- ret = pm_runtime_get_sync(dev);
- if (ret < 0)
+ ret = clk_prepare_enable(tdma->dma_clk);
+ if (ret < 0) {
+ dev_err(dev, "clk_enable failed: %d\n", ret);
return ret;
+ }
tdma_write(tdma, TEGRA_APBDMA_GENERAL, tdma->reg_gen);
tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
@@ -1582,16 +1554,14 @@ static int tegra_dma_pm_resume(struct device *dev)
(ch_reg->csr & ~TEGRA_APBDMA_CSR_ENB));
}
- /* Disable clock */
- pm_runtime_put(dev);
return 0;
}
-#endif
static const struct dev_pm_ops tegra_dma_dev_pm_ops = {
SET_RUNTIME_PM_OPS(tegra_dma_runtime_suspend, tegra_dma_runtime_resume,
NULL)
- SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
};
static const struct of_device_id tegra_dma_of_match[] = {
--
2.18.0