[PATCH v2 40/48] media: staging: tegra-vde: Support OPP and generic power domain

[Dmitry Osipenko]

Add OPP and generic power domain support to the video decoder driver.
This allows us to utilize a modern GENPD API for newer device-trees and
support DVFS of the decoder hardware. Note that older DTBs will continue
to work like they did it before this patch.

Tested-by: Peter Geis <pgwipeout@xxxxxxxxx>
Tested-by: Nicolas Chauvet <kwizart@xxxxxxxxx>
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
 drivers/staging/media/tegra-vde/vde.c | 63 ++++++++++++++++++++++-----
 1 file changed, 53 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/media/tegra-vde/vde.c b/drivers/staging/media/tegra-vde/vde.c
index 28845b5bafaf..5be26b9bd5d8 100644
--- a/drivers/staging/media/tegra-vde/vde.c
+++ b/drivers/staging/media/tegra-vde/vde.c
@@ -15,11 +15,14 @@
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_opp.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 
+#include <soc/tegra/common.h>
 #include <soc/tegra/pmc.h>
 
 #include "uapi.h"
@@ -918,13 +921,17 @@ static __maybe_unused int tegra_vde_runtime_suspend(struct device *dev)
 	struct tegra_vde *vde = dev_get_drvdata(dev);
 	int err;
 
-	err = tegra_powergate_power_off(TEGRA_POWERGATE_VDEC);
-	if (err) {
-		dev_err(dev, "Failed to power down HW: %d\n", err);
-		return err;
+	if (!dev->pm_domain) {
+		err = tegra_powergate_power_off(TEGRA_POWERGATE_VDEC);
+		if (err) {
+			dev_err(dev, "Failed to power down HW: %d\n", err);
+			return err;
+		}
 	}
 
 	clk_disable_unprepare(vde->clk);
+	reset_control_release(vde->rst);
+	dev_pm_opp_set_rate(dev, 0);
 
 	return 0;
 }
@@ -934,18 +941,44 @@ static __maybe_unused int tegra_vde_runtime_resume(struct device *dev)
 	struct tegra_vde *vde = dev_get_drvdata(dev);
 	int err;
 
-	err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_VDEC,
-						vde->clk, vde->rst);
+	err = dev_pm_opp_set_rate(dev, clk_get_rate(vde->clk));
+	if (err) {
+		dev_err(dev, "Failed to prepare OPP: %d\n", err);
+		return err;
+	}
+
+	err = reset_control_acquire(vde->rst);
 	if (err) {
-		dev_err(dev, "Failed to power up HW : %d\n", err);
+		dev_err(dev, "Failed to acquire reset: %d\n", err);
 		return err;
 	}
 
+	if (!dev->pm_domain) {
+		err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_VDEC,
+							vde->clk, vde->rst);
+		if (err) {
+			dev_err(dev, "Failed to power up HW : %d\n", err);
+			goto release_reset;
+		}
+	}
+
+	err = clk_prepare_enable(vde->clk);
+	if (err) {
+		dev_err(dev, "Failed to enable clock: %d\n", err);
+		goto release_reset;
+	}
+
 	return 0;
+
+release_reset:
+	reset_control_release(vde->rst);
+
+	return err;
 }
 
 static int tegra_vde_probe(struct platform_device *pdev)
 {
+	struct tegra_core_opp_params opp_params = {};
 	struct device *dev = &pdev->dev;
 	struct tegra_vde *vde;
 	int irq, err;
@@ -999,7 +1032,7 @@ static int tegra_vde_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	vde->rst = devm_reset_control_get(dev, NULL);
+	vde->rst = devm_reset_control_get_exclusive_released(dev, NULL);
 	if (IS_ERR(vde->rst)) {
 		err = PTR_ERR(vde->rst);
 		dev_err(dev, "Could not get VDE reset %d\n", err);
@@ -1024,6 +1057,12 @@ static int tegra_vde_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	opp_params.init_state = true;
+
+	err = devm_tegra_core_dev_init_opp_table(dev, &opp_params);
+	if (err && err != -ENODEV)
+		return err;
+
 	vde->iram_pool = of_gen_pool_get(dev->of_node, "iram", 0);
 	if (!vde->iram_pool) {
 		dev_err(dev, "Could not get IRAM pool\n");
@@ -1117,8 +1156,12 @@ static void tegra_vde_shutdown(struct platform_device *pdev)
 	 * On some devices bootloader isn't ready to a power-gated VDE on
 	 * a warm-reboot, machine will hang in that case.
 	 */
-	if (pm_runtime_status_suspended(&pdev->dev))
-		tegra_vde_runtime_resume(&pdev->dev);
+	if (pm_runtime_status_suspended(&pdev->dev)) {
+		if (pdev->dev.pm_domain)
+			dev_pm_genpd_resume(&pdev->dev);
+		else
+			tegra_vde_runtime_resume(&pdev->dev);
+	}
 }
 
 static __maybe_unused int tegra_vde_pm_suspend(struct device *dev)
-- 
2.29.2