From: Thierry Reding treding@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 treding@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)) {