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drm/arm/hdlcd: Reject atomic commits that disable only the plane

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The HDLCD engine needs an active plane while the CRTC is active, as
it will start scanning out data from HDLCD_REG_FB_BASE once it gets
enabled. Make sure that the only available plane doesn't get disabled
while the CRTC remains active, as this will scanout invalid data.

Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
This commit is contained in:
Liviu Dudau
2018-07-23 12:05:53 +01:00
parent 9fd466f54f
commit d664b851eb
2 changed files with 19 additions and 17 deletions
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13
drivers/gpu/drm/arm/hdlcd_drv.c
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@@ -325,6 +325,7 @@ err_fbdev:
err_vblank:
pm_runtime_disable(drm->dev);
err_pm_active:
drm_atomic_helper_shutdown(drm);
component_unbind_all(dev, drm);
err_unload:
of_node_put(hdlcd->crtc.port);
@@ -350,16 +351,18 @@ static void hdlcd_drm_unbind(struct device *dev)
component_unbind_all(dev, drm);
of_node_put(hdlcd->crtc.port);
hdlcd->crtc.port = NULL;
pm_runtime_get_sync(drm->dev);
pm_runtime_get_sync(dev);
drm_crtc_vblank_off(&hdlcd->crtc);
drm_irq_uninstall(drm);
pm_runtime_put_sync(drm->dev);
pm_runtime_disable(drm->dev);
of_reserved_mem_device_release(drm->dev);
drm_atomic_helper_shutdown(drm);
pm_runtime_put(dev);
if (pm_runtime_enabled(dev))
pm_runtime_disable(dev);
of_reserved_mem_device_release(dev);
drm_mode_config_cleanup(drm);
drm_dev_put(drm);
drm->dev_private = NULL;
dev_set_drvdata(dev, NULL);
drm_dev_put(drm);
}
static const struct component_master_ops hdlcd_master_ops = {