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[v4,11/11] drm/tegra: Reset the SOR on probe

Message ID 1423667220-1062-12-git-send-email-tomeu.vizoso@collabora.com (mailing list archive)
State New, archived
Headers show

Commit Message

Tomeu Vizoso Feb. 11, 2015, 3:06 p.m. UTC 
As there isn't a way for the firmware on the Nyan chromebooks to hand
over the display to the kernel.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---
 drivers/gpu/drm/tegra/sor.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index 2afe478..e6caacc 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -1458,6 +1458,20 @@  static int tegra_sor_probe(struct platform_device *pdev)
 
 	mutex_init(&sor->lock);
 
+	err = reset_control_assert(sor->rst);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to assert SOR reset: %d\n", err);
+		return err;
+	}
+
+	msleep(20);
+
+	err = reset_control_deassert(sor->rst);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to deassert SOR reset: %d\n", err);
+		return err;
+	}
+
 	err = host1x_client_register(&sor->client);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to register host1x client: %d\n",