[media] coda: Add runtime pm support
This patch allows to use the runtime pm and generic pm domain frameworks
to completely gate power to the VPU if it is unused. This functionality
is available on i.MX6.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index 782b09e..131cb5f 100644
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -22,6 +22,7 @@
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/of.h>
@@ -2767,6 +2768,13 @@
ctx->reg_idx = idx;
}
+ /* Power up and upload firmware if necessary */
+ ret = pm_runtime_get_sync(&dev->plat_dev->dev);
+ if (ret < 0) {
+ v4l2_err(&dev->v4l2_dev, "failed to power up: %d\n", ret);
+ goto err_pm_get;
+ }
+
ret = clk_prepare_enable(dev->clk_per);
if (ret)
goto err_clk_per;
@@ -2836,6 +2844,8 @@
err_clk_ahb:
clk_disable_unprepare(dev->clk_per);
err_clk_per:
+ pm_runtime_put_sync(&dev->plat_dev->dev);
+err_pm_get:
v4l2_fh_del(&ctx->fh);
v4l2_fh_exit(&ctx->fh);
clear_bit(ctx->idx, &dev->instance_mask);
@@ -2877,6 +2887,7 @@
v4l2_ctrl_handler_free(&ctx->ctrls);
clk_disable_unprepare(dev->clk_ahb);
clk_disable_unprepare(dev->clk_per);
+ pm_runtime_put_sync(&dev->plat_dev->dev);
v4l2_fh_del(&ctx->fh);
v4l2_fh_exit(&ctx->fh);
clear_bit(ctx->idx, &dev->instance_mask);
@@ -3191,7 +3202,7 @@
ret = clk_prepare_enable(dev->clk_per);
if (ret)
- return ret;
+ goto err_clk_per;
ret = clk_prepare_enable(dev->clk_ahb);
if (ret)
@@ -3317,6 +3328,7 @@
err_clk_ahb:
clk_disable_unprepare(dev->clk_per);
+err_clk_per:
return ret;
}
@@ -3342,10 +3354,29 @@
memcpy(dev->codebuf.vaddr, fw->data, fw->size);
release_firmware(fw);
- ret = coda_hw_init(dev);
- if (ret) {
- v4l2_err(&dev->v4l2_dev, "HW initialization failed\n");
- return;
+ if (pm_runtime_enabled(&pdev->dev) && pdev->dev.pm_domain) {
+ /*
+ * Enabling power temporarily will cause coda_hw_init to be
+ * called via coda_runtime_resume by the pm domain.
+ */
+ ret = pm_runtime_get_sync(&dev->plat_dev->dev);
+ if (ret < 0) {
+ v4l2_err(&dev->v4l2_dev, "failed to power on: %d\n",
+ ret);
+ return;
+ }
+
+ pm_runtime_put_sync(&dev->plat_dev->dev);
+ } else {
+ /*
+ * If runtime pm is disabled or pm_domain is not set,
+ * initialize once manually.
+ */
+ ret = coda_hw_init(dev);
+ if (ret < 0) {
+ v4l2_err(&dev->v4l2_dev, "HW initialization failed\n");
+ return;
+ }
}
dev->vfd.fops = &coda_fops,
@@ -3583,6 +3614,8 @@
platform_set_drvdata(pdev, dev);
+ pm_runtime_enable(&pdev->dev);
+
return coda_firmware_request(dev);
}
@@ -3593,6 +3626,7 @@
video_unregister_device(&dev->vfd);
if (dev->m2m_dev)
v4l2_m2m_release(dev->m2m_dev);
+ pm_runtime_disable(&pdev->dev);
if (dev->alloc_ctx)
vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
v4l2_device_unregister(&dev->v4l2_dev);
@@ -3606,6 +3640,26 @@
return 0;
}
+#ifdef CONFIG_PM_RUNTIME
+static int coda_runtime_resume(struct device *dev)
+{
+ struct coda_dev *cdev = dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (dev->pm_domain) {
+ ret = coda_hw_init(cdev);
+ if (ret)
+ v4l2_err(&cdev->v4l2_dev, "HW initialization failed\n");
+ }
+
+ return ret;
+}
+#endif
+
+static const struct dev_pm_ops coda_pm_ops = {
+ SET_RUNTIME_PM_OPS(NULL, coda_runtime_resume, NULL)
+};
+
static struct platform_driver coda_driver = {
.probe = coda_probe,
.remove = coda_remove,
@@ -3613,6 +3667,7 @@
.name = CODA_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(coda_dt_ids),
+ .pm = &coda_pm_ops,
},
.id_table = coda_platform_ids,
};