HDMI currently stops working after a system suspend/resume cycle. The
cause is that the mode setting states in hardware gets lost and isn't
restored across the suspend/resume cycle.
The patch adds a very basic suspend/resume support to imx-drm driver,
and calls drm_helper_resume_force_mode() in .resume hook to restore the
mode setting states, so that HDMI can continue working after a system
suspend/resume cycle.
Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxxxxx>
---
Changs since v1:
- Do not walk through connector->funcs->dpms() but only call
drm_helper_resume_force_mode() in .resume.
drivers/staging/imx-drm/imx-drm-core.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
index def8280d7ee6..ab41152089a3 100644
--- a/drivers/staging/imx-drm/imx-drm-core.c
+++ b/drivers/staging/imx-drm/imx-drm-core.c
@@ -696,6 +696,29 @@ static int imx_drm_platform_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int imx_drm_suspend(struct device *dev)
+{
+ struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+ drm_kms_helper_poll_disable(drm_dev);
+
+ return 0;
+}
+
+static int imx_drm_resume(struct device *dev)
+{
+ struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+ drm_helper_resume_force_mode(drm_dev);
+ drm_kms_helper_poll_enable(drm_dev);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
+
static const struct of_device_id imx_drm_dt_ids[] = {
{ .compatible = "fsl,imx-display-subsystem", },
{ /* sentinel */ },
@@ -708,6 +731,7 @@ static struct platform_driver imx_drm_pdrv = {
.driver = {
.owner = THIS_MODULE,
.name = "imx-drm",
+ .pm = &imx_drm_pm_ops,
.of_match_table = imx_drm_dt_ids,
},
};
--
1.9.1
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