From: Thierry Reding <tred...@nvidia.com>
If the GPU clock has not had a rate set, initialize it to the maximum
clock rate to make sure it does run.
Signed-off-by: Thierry Reding <tred...@nvidia.com>
---
drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
index 747a775121cf..d0d52c1d4aee 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
@@ -279,6 +279,7 @@ nvkm_device_tegra_new(const struct nvkm_device_tegra_func
*func,
struct nvkm_device **pdevice)
{
struct nvkm_device_tegra *tdev;
+ unsigned long rate;
int ret;
if (!(tdev = kzalloc(sizeof(*tdev), GFP_KERNEL)))
@@ -307,6 +308,17 @@ nvkm_device_tegra_new(const struct nvkm_device_tegra_func
*func,
goto free;
}
+ rate = clk_get_rate(tdev->clk);
+ if (rate == 0) {
+ ret = clk_set_rate(tdev->clk, ULONG_MAX);
+ if (ret < 0)
+ goto free;
+
+ rate = clk_get_rate(tdev->clk);
+
+ dev_dbg(&pdev->dev, "GPU clock set to %lu\n", rate);
+ }
+
if (func->require_ref_clk)
tdev->clk_ref = devm_clk_get(&pdev->dev, "ref");
if (IS_ERR(tdev->clk_ref)) {
--
2.23.0
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