drm/exynos: Call drm_atomic_helper_shutdown() at shutdown/unbind time

[ Upstream commit 16ac5b21b31b439f03cdf44c153c5f5af94fb3eb ]

Based on grepping through the source code this driver appears to be
missing a call to drm_atomic_helper_shutdown() at system shutdown time
and at driver unbind time. Among other things, this means that if a
panel is in use that it won't be cleanly powered off at system
shutdown time.

The fact that we should call drm_atomic_helper_shutdown() in the case
of OS shutdown/restart and at driver remove (or unbind) time comes
straight out of the kernel doc "driver instance overview" in
drm_drv.c.

A few notes about this fix:
- When adding drm_atomic_helper_shutdown() to the unbind path, I added
  it after drm_kms_helper_poll_fini() since that's when other drivers
  seemed to have it.
- Technically with a previous patch, ("drm/atomic-helper:
  drm_atomic_helper_shutdown(NULL) should be a noop"), we don't
  actually need to check to see if our "drm" pointer is NULL before
  calling drm_atomic_helper_shutdown(). We'll leave the "if" test in,
  though, so that this patch can land without any dependencies. It
  could potentially be removed later.
- This patch also makes sure to set the drvdata to NULL in the case of
  bind errors to make sure that shutdown can't access freed data.

Suggested-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 8399256..5380fb6 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -300,6 +300,7 @@ err_mode_config_cleanup:
        drm_mode_config_cleanup(drm);
        exynos_drm_cleanup_dma(drm);
        kfree(private);
+       dev_set_drvdata(dev, NULL);
 err_free_drm:
        drm_dev_put(drm);
 
@@ -313,6 +314,7 @@ static void exynos_drm_unbind(struct device *dev)
        drm_dev_unregister(drm);
 
        drm_kms_helper_poll_fini(drm);
+       drm_atomic_helper_shutdown(drm);
 
        component_unbind_all(drm->dev, drm);
        drm_mode_config_cleanup(drm);
@@ -350,9 +352,18 @@ static int exynos_drm_platform_remove(struct platform_device *pdev)
        return 0;
 }
 
+static void exynos_drm_platform_shutdown(struct platform_device *pdev)
+{
+       struct drm_device *drm = platform_get_drvdata(pdev);
+
+       if (drm)
+               drm_atomic_helper_shutdown(drm);
+}
+
 static struct platform_driver exynos_drm_platform_driver = {
        .probe  = exynos_drm_platform_probe,
        .remove = exynos_drm_platform_remove,
+       .shutdown = exynos_drm_platform_shutdown,
        .driver = {
                .name   = "exynos-drm",
                .pm     = &exynos_drm_pm_ops,