[PATCHv2 1/2] drm: atmel-hlcdc: Add PM suspend/resume support

Sylvain Rochet
2015-02-12T20:49:35Z

On suspend: switch off CRTC if not already suspended with runtime PM

On resume: switch on CRTC if we were not already suspended from runtime
PM while suspending.

Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
---
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 60 ++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index 22c3cca..e22883b 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -427,6 +427,36 @@ static void atmel_hlcdc_dc_lastclose(struct drm_device *dev)
drm_fbdev_cma_restore_mode(dc->fbdev);
}

+static int atmel_hlcdc_dc_suspend(struct drm_device *dev, pm_message_t state)
+{
+ struct drm_crtc *crtc;
+
+ drm_modeset_lock_all(dev);
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+ crtc_funcs->disable(crtc);
+ }
+
+ drm_modeset_unlock_all(dev);
+ return 0;
+}
+
+static int atmel_hlcdc_dc_resume(struct drm_device *dev)
+{
+ struct drm_crtc *crtc;
+
+ drm_modeset_lock_all(dev);
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+ crtc_funcs->enable(crtc);
+ }
+
+ drm_modeset_unlock_all(dev);
+ return 0;
+}
+
static int atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
{
struct atmel_hlcdc_dc *dc = dev->dev_private;
@@ -488,6 +518,8 @@ static struct drm_driver atmel_hlcdc_dc_driver = {
.driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
.preclose = atmel_hlcdc_dc_preclose,
.lastclose = atmel_hlcdc_dc_lastclose,
+ .suspend = atmel_hlcdc_dc_suspend,
+ .resume = atmel_hlcdc_dc_resume,
.irq_handler = atmel_hlcdc_dc_irq_handler,
.irq_preinstall = atmel_hlcdc_dc_irq_uninstall,
.irq_postinstall = atmel_hlcdc_dc_irq_postinstall,
@@ -559,6 +591,33 @@ static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
return 0;
}

+#ifdef CONFIG_PM
+static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
+{
+ struct drm_device *drm_dev = dev_get_drvdata(dev);
+ pm_message_t message;
+
+ if (pm_runtime_suspended(dev) || !drm_dev)
+ return 0;
+
+ message.event = PM_EVENT_SUSPEND;
+ return atmel_hlcdc_dc_suspend(drm_dev, message);
+}
+
+static int atmel_hlcdc_dc_drm_resume(struct device *dev)
+{
+ struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+ if (pm_runtime_suspended(dev) || !drm_dev)
+ return 0;
+
+ return atmel_hlcdc_dc_resume(drm_dev);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(atmel_hlcdc_dc_drm_pm_ops,
+ atmel_hlcdc_dc_drm_suspend, atmel_hlcdc_dc_drm_resume);
+
static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
{ .compatible = "atmel,hlcdc-display-controller" },
{ },
@@ -569,6 +628,7 @@ static struct platform_driver atmel_hlcdc_dc_platform_driver = {
.remove = atmel_hlcdc_dc_drm_remove,
.driver = {
.name = "atmel-hlcdc-display-controller",
+ .pm = &atmel_hlcdc_dc_drm_pm_ops,
.of_match_table = atmel_hlcdc_dc_of_match,
},
};
--
2.1.4