[PATCH] gpu: host1x: Skip reset assert on Tegra186

[Mikko Perttunen]

From: Mikko Perttunen <mperttunen at nvidia.com>

On Tegra186, other software components may rely on the kernel to
keep Host1x operational even during suspend. As such, as a quirk,
skip asserting Host1x's reset on Tegra186.

We don't need to keep the clocks enabled, as BPMP ensures the clock
stays on while Host1x is being used. On newer SoC's, the reset line
is inaccessible, so there is no need for the quirk.

Signed-off-by: Mikko Perttunen <mperttunen at nvidia.com>
---
 drivers/gpu/host1x/dev.c | 15 +++++++++------
 drivers/gpu/host1x/dev.h |  1 +
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 42fd504abbcd..89983d7d73ca 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -169,6 +169,7 @@ static const struct host1x_info host1x06_info = {
 	.num_sid_entries = ARRAY_SIZE(tegra186_sid_table),
 	.sid_table = tegra186_sid_table,
 	.reserve_vblank_syncpts = false,
+	.skip_reset_assert = true,
 };
 
 static const struct host1x_sid_entry tegra194_sid_table[] = {
@@ -680,13 +681,15 @@ static int __maybe_unused host1x_runtime_suspend(struct device *dev)
 	host1x_intr_stop(host);
 	host1x_syncpt_save(host);
 
-	err = reset_control_bulk_assert(host->nresets, host->resets);
-	if (err) {
-		dev_err(dev, "failed to assert reset: %d\n", err);
-		goto resume_host1x;
-	}
+	if (!host->info->skip_reset_assert) {
+		err = reset_control_bulk_assert(host->nresets, host->resets);
+		if (err) {
+			dev_err(dev, "failed to assert reset: %d\n", err);
+			goto resume_host1x;
+		}
 
-	usleep_range(1000, 2000);
+		usleep_range(1000, 2000);
+	}
 
 	clk_disable_unprepare(host->clk);
 	reset_control_bulk_release(host->nresets, host->resets);
diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index c8e302de7625..9c13e71a31ff 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -116,6 +116,7 @@ struct host1x_info {
 	 * the display driver disables VBLANK increments.
 	 */
 	bool reserve_vblank_syncpts;
+	bool skip_reset_assert;
 };
 
 struct host1x {
-- 
2.42.0