gpu: host1x: Fix boot regression for Tegra

Commit 4c27ac4 ("gpu: host1x: Request syncpoint IRQs only during
probe") caused a boot regression for the Tegra186 device. Following this
update the function host1x_intr_init() now calls
host1x_hw_intr_disable_all_syncpt_intrs() during probe. However,
host1x_intr_init() is called before runtime power-management is enabled
for Host1x and the function host1x_hw_intr_disable_all_syncpt_intrs() is
accessing hardware registers. So if the Host1x hardware is not enabled
prior to probing then the device will now hang on attempting to access
the registers. So far this is only observed on Tegra186, but potentially
could be seen on other devices.

Fix this by moving the call to the function host1x_intr_init() in probe
to after enabling the runtime power-management in the probe and update
the failure path in probe as necessary.

Fixes: 4c27ac4 ("gpu: host1x: Request syncpoint IRQs only during probe")
Signed-off-by: Jon Hunter <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit dc56f84)
Signed-off-by: Thierry Reding <[email protected]>

Author: jonhunter

drivers/gpu/host1x/dev.c

@@ -625,12 +625,6 @@ static int host1x_probe(struct platform_device *pdev)
 		goto free_contexts;
 	}
 
-	err = host1x_intr_init(host);
-	if (err) {
-		dev_err(&pdev->dev, "failed to initialize interrupts\n");
-		goto deinit_syncpt;
-	}
-
 	pm_runtime_enable(&pdev->dev);
 
 	err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev);
@@ -642,6 +636,12 @@ static int host1x_probe(struct platform_device *pdev)
 	if (err)
 		goto pm_disable;
 
+	err = host1x_intr_init(host);
+	if (err) {
+		dev_err(&pdev->dev, "failed to initialize interrupts\n");
+		goto pm_put;
+	}
+
 	host1x_debug_init(host);
 
 	err = host1x_register(host);
@@ -658,13 +658,11 @@ static int host1x_probe(struct platform_device *pdev)
 	host1x_unregister(host);
 deinit_debugfs:
 	host1x_debug_deinit(host);
-
+	host1x_intr_deinit(host);
+pm_put:
 	pm_runtime_put_sync_suspend(&pdev->dev);
 pm_disable:
 	pm_runtime_disable(&pdev->dev);
-
-	host1x_intr_deinit(host);
-deinit_syncpt:
 	host1x_syncpt_deinit(host);
 free_contexts:
 	host1x_memory_context_list_free(&host->context_list);