[PATCH v2 6/9] dmaengine: st_fdma: Add fdma suspend and resume callbacks.
From: Peter Griffin <hidden>
Date: 2015-09-11 14:16:06
Also in:
linux-arm-kernel, lkml
Subsystem:
arm/sti architecture, dma generic offload engine subsystem, the rest · Maintainers:
Patrice Chotard, Vinod Koul, Linus Torvalds
This patch adds the functions to gate the xp70 clock on suspend and resume. Signed-off-by: Ludovic Barre <redacted> Signed-off-by: Peter Griffin <redacted> --- drivers/dma/st_fdma.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+)
diff --git a/drivers/dma/st_fdma.c b/drivers/dma/st_fdma.c
index 4288e79..de3afefb 100644
--- a/drivers/dma/st_fdma.c
+++ b/drivers/dma/st_fdma.c@@ -1127,10 +1127,56 @@ static int st_fdma_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int st_fdma_pm_suspend(struct device *dev) +{ + struct st_fdma_dev *fdev = dev_get_drvdata(dev); + int ret; + + if (atomic_read(&fdev->fw_loaded)) { + ret = st_fdma_disable(fdev); + if (ret & FDMA_EN_RUN) { + dev_warn(fdev->dev, "Failed to disable channels"); + return -EBUSY; + } + } + + st_fdma_clk_disable(fdev); + + return 0; +} + +static int st_fdma_pm_resume(struct device *dev) +{ + struct st_fdma_dev *fdev = dev_get_drvdata(dev); + int ret; + + ret = st_fdma_clk_enable(fdev); + if (ret) { + dev_err(fdev->dev, "Failed to enable clocks\n"); + goto out; + } + + ret = st_fdma_get_fw(fdev); +out: + return ret; +} + +static const struct dev_pm_ops st_fdma_pm = { + .suspend_late = st_fdma_pm_suspend, + .resume_early = st_fdma_pm_resume, +}; + +#define ST_FDMA_PM (&st_fdma_pm) +#else +#define ST_FDMA_PM NULL +#endif + static struct platform_driver st_fdma_platform_driver = { .driver = { .name = "st-fdma", .of_match_table = st_fdma_match, + .pm = ST_FDMA_PM, }, .probe = st_fdma_probe, .remove = st_fdma_remove,
--
1.9.1
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