From: Tomasz Figa tfiga@chromium.org
Driver callbacks, such as system suspend or resume can be called any time, specifically they can be called before the component bind callback. Let's use dp->adp pointer as a safeguard and skip calling Analogix entry points if it is an ERR_PTR().
Signed-off-by: Tomasz Figa tfiga@chromium.org Signed-off-by: Thierry Escande thierry.escande@collabora.com Signed-off-by: Enric Balletbo i Serra enric.balletbo@collabora.com ---
drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c index 23317a2269e1..6d45d62466b3 100644 --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c @@ -368,6 +368,8 @@ static void rockchip_dp_unbind(struct device *dev, struct device *master, analogix_dp_unbind(dp->adp); rockchip_drm_psr_unregister(&dp->encoder); dp->encoder.funcs->destroy(&dp->encoder); + + dp->adp = ERR_PTR(-ENODEV); }
static const struct component_ops rockchip_dp_component_ops = { @@ -391,6 +393,7 @@ static int rockchip_dp_probe(struct platform_device *pdev) return -ENOMEM;
dp->dev = dev; + dp->adp = ERR_PTR(-ENODEV); dp->plat_data.panel = panel;
ret = rockchip_dp_of_probe(dp); @@ -414,6 +417,9 @@ static int rockchip_dp_suspend(struct device *dev) { struct rockchip_dp_device *dp = dev_get_drvdata(dev);
+ if (IS_ERR(dp->adp)) + return 0; + return analogix_dp_suspend(dp->adp); }
@@ -421,6 +427,9 @@ static int rockchip_dp_resume(struct device *dev) { struct rockchip_dp_device *dp = dev_get_drvdata(dev);
+ if (IS_ERR(dp->adp)) + return 0; + return analogix_dp_resume(dp->adp); } #endif