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drm/nouveau/tegra: Set clock rate if not set

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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 <treding@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Thierry Reding 2019-12-09 13:00:02 +01:00 committed by Ben Skeggs
parent b0b651aedb
commit fc12262b96
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
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@ -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)) {