On 04/18/2017 04:38 PM, Eric Anholt wrote:
> For the Raspberry Pi's bindings, the power domain also implicitly
> turns on the clock and deasserts reset, but for the new Cygnus port we
> start representing the clock in the devicetree.
>
> v2: Document the clock-names property, check for -ENOENT for no clock
> in DT.
>
> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
> ---
> + if (v3d->clk)
> + clk_disable_unprepare(v3d->clk);
The clock API allows you to pass a NULL clk and do nothing in these
cases which is what you seem to have done a few lines below, you could
simplify these checks?
> +
> return 0;
> }
>
> @@ -318,6 +322,13 @@ static int vc4_v3d_runtime_resume(struct device *dev)
> if (ret)
> return ret;
>
> + if (v3d->clk) {
> + int ret = clk_prepare_enable(v3d->clk);
> +
> + if (ret != 0)
> + return ret;
> + }
> +
> vc4_v3d_init_hw(vc4->dev);
> vc4_irq_postinstall(vc4->dev);
>
> @@ -348,15 +359,40 @@ static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
> vc4->v3d = v3d;
> v3d->vc4 = vc4;
>
> + v3d->clk = devm_clk_get(dev, "v3d_clk");
> + if (IS_ERR(v3d->clk)) {
> + int ret = PTR_ERR(v3d->clk);
> +
> + if (ret == -ENOENT) {
> + /* bcm2835 didn't have a clock reference in the DT. */
> + ret = 0;
> + v3d->clk = NULL;
> + } else {
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get V3D clock: %d\n",
> + ret);
> + return ret;
> + }
> + }
> +
> if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
> DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
> V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
> return -EINVAL;
> }
>
> + if (v3d->clk) {
> + ret = clk_prepare_enable(v3d->clk);
> + if (ret != 0)
> + return ret;
> + }
> +
> ret = vc4_allocate_bin_bo(drm);
> - if (ret)
> + if (ret) {
> + if (v3d->clk)
> + clk_disable_unprepare(v3d->clk);
> return ret;
> + }
>
> /* Reset the binner overflow address/size at setup, to be sure
> * we don't reuse an old one.
>
--
Florian
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