[PATCH] drm/tegra: dc: Propagate powergate failures on suspend

[Pengpeng Hou]

A lifecycle transition can continue after a required state restore
operation fails, leaving software state inconsistent with hardware.

Propagate the failure and unwind state acquired by the transition so
callers cannot observe a false success.

Signed-off-by: Pengpeng Hou <pengpeng@xxxxxxxxxxx>
---
 drivers/gpu/drm/tegra/dc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 0b3fcc7011b3..bac78b57dcff 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -2878,8 +2878,14 @@ static int tegra_dc_runtime_suspend(struct host1x_client *client)
 		return err;
 	}
 
-	if (dc->soc->has_powergate)
-		tegra_pmc_powergate_power_off(dc->pmc, dc->powergate);
+	if (dc->soc->has_powergate) {
+		err = tegra_pmc_powergate_power_off(dc->pmc, dc->powergate);
+		if (err < 0) {
+			dev_err(dev, "failed to powergate partition: %d\n", err);
+			reset_control_deassert(dc->rst);
+			return err;
+		}
+	}
 
 	clk_disable_unprepare(dc->clk);
 	pm_runtime_put_sync(dev);
-- 
2.43.0