drm/imagination: Implement power management

Add power management to the driver, using runtime pm. The power off
sequence depends on firmware commands which are not implemented in this
patch.

Changes since v8:
- Corrected license identifiers

Changes since v5:
- Use RUNTIME_PM_OPS() to declare PM callbacks
- Add Kconfig dependency on CONFIG_PM

Changes since v4:
- Suspend runtime PM before unplugging device on rmmod

Changes since v3:
- Don't power device when calling pvr_device_gpu_fini()
- Documentation for pvr_dev->lost has been improved
- pvr_power_init() renamed to pvr_watchdog_init()
- Use drm_dev_{enter,exit}

Changes since v2:
- Use runtime PM
- Implement watchdog

Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Donald Robson <donald.robson@imgtec.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/e09af4ef1ff514e1d6d7f97c7c5032c643c56f9c.1700668843.git.donald.robson@imgtec.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

1 files changed, 19 insertions, 1 deletions

diff --git a/drivers/gpu/drm/imagination/pvr_drv.c b/drivers/gpu/drm/imagination/pvr_drv.c
index 6d3bc886e1c3..12e136217c45 100644
--- a/drivers/gpu/drm/imagination/pvr_drv.c
+++ b/drivers/gpu/drm/imagination/pvr_drv.c
@@ -5,6 +5,7 @@
 #include "pvr_drv.h"
 #include "pvr_gem.h"
 #include "pvr_mmu.h"
+#include "pvr_power.h"
 #include "pvr_rogue_defs.h"
 #include "pvr_rogue_fwif_client.h"
 #include "pvr_rogue_fwif_shared.h"
@@ -1265,9 +1266,16 @@ pvr_probe(struct platform_device *plat_dev)
 
 	platform_set_drvdata(plat_dev, drm_dev);
 
+	devm_pm_runtime_enable(&plat_dev->dev);
+	pm_runtime_mark_last_busy(&plat_dev->dev);
+
+	pm_runtime_set_autosuspend_delay(&plat_dev->dev, 50);
+	pm_runtime_use_autosuspend(&plat_dev->dev);
+	pvr_watchdog_init(pvr_dev);
+
 	err = pvr_device_init(pvr_dev);
 	if (err)
-		return err;
+		goto err_watchdog_fini;
 
 	err = drm_dev_register(drm_dev, 0);
 	if (err)
@@ -1278,6 +1286,9 @@ pvr_probe(struct platform_device *plat_dev)
 err_device_fini:
 	pvr_device_fini(pvr_dev);
 
+err_watchdog_fini:
+	pvr_watchdog_fini(pvr_dev);
+
 	return err;
 }
 
@@ -1287,8 +1298,10 @@ pvr_remove(struct platform_device *plat_dev)
 	struct drm_device *drm_dev = platform_get_drvdata(plat_dev);
 	struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
 
+	pm_runtime_suspend(drm_dev->dev);
 	pvr_device_fini(pvr_dev);
 	drm_dev_unplug(drm_dev);
+	pvr_watchdog_fini(pvr_dev);
 
 	return 0;
 }
@@ -1299,11 +1312,16 @@ static const struct of_device_id dt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, dt_match);
 
+static const struct dev_pm_ops pvr_pm_ops = {
+	RUNTIME_PM_OPS(pvr_power_device_suspend, pvr_power_device_resume, pvr_power_device_idle)
+};
+
 static struct platform_driver pvr_driver = {
 	.probe = pvr_probe,
 	.remove = pvr_remove,
 	.driver = {
 		.name = PVR_DRIVER_NAME,
+		.pm = &pvr_pm_ops,
 		.of_match_table = dt_match,
 	},
 };