On Thu, Mar 11, 2021 at 04:22:51PM -0800, Bjorn Andersson wrote:
> The remoteproc driver is split between the responsibilities of getting
> the SoC-internal ARM core up and running and the external RF (aka
> "Iris") part configured.
>
> In order to satisfy the regulator framework's need of a struct device *
> to look up supplies this was implemented as two different drivers, using
> of_platform_populate() in the remoteproc part to probe the iris part.
>
> Unfortunately it's possible that the iris part probe defers on yet not
> available regulators and an attempt to start the remoteproc will have to
> be rejected, until this has been resolved. But there's no useful
> mechanism of knowing when this would be.
>
> Instead replace the of_platform_populate() and the iris probe with a
> function that rolls its own struct device, with the relevant of_node
> associated that is enough to acquire regulators and clocks specified in
> the DT node and that may propagate the EPROBE_DEFER back to the wcnss
> device's probe.
>
> Reported-by: Anibal Limon <anibal.li...@linaro.org>
> Reported-by: Loic Poulain <loic.poul...@linaro.org>
> Signed-off-by: Bjorn Andersson <bjorn.anders...@linaro.org>
> ---
> drivers/remoteproc/qcom_wcnss.c | 52 ++++--------
> drivers/remoteproc/qcom_wcnss.h | 4 +-
> drivers/remoteproc/qcom_wcnss_iris.c | 120 +++++++++++++++++----------
> 3 files changed, 91 insertions(+), 85 deletions(-)
Acked-by: Mathieu Poirier <mathieu.poir...@linaro.org>
>
> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_wcnss.c
> index e8007cc01bfa..2f482ab6aade 100644
> --- a/drivers/remoteproc/qcom_wcnss.c
> +++ b/drivers/remoteproc/qcom_wcnss.c
> @@ -142,18 +142,6 @@ static const struct wcnss_data pronto_v2_data = {
> .num_vregs = 1,
> };
>
> -void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss,
> - struct qcom_iris *iris,
> - bool use_48mhz_xo)
> -{
> - mutex_lock(&wcnss->iris_lock);
> -
> - wcnss->iris = iris;
> - wcnss->use_48mhz_xo = use_48mhz_xo;
> -
> - mutex_unlock(&wcnss->iris_lock);
> -}
> -
> static int wcnss_load(struct rproc *rproc, const struct firmware *fw)
> {
> struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
> @@ -639,12 +627,20 @@ static int wcnss_probe(struct platform_device *pdev)
> goto detach_pds;
> }
>
> + wcnss->iris = qcom_iris_probe(&pdev->dev, &wcnss->use_48mhz_xo);
> + if (IS_ERR(wcnss->iris)) {
> + ret = PTR_ERR(wcnss->iris);
> + goto detach_pds;
> + }
> +
> ret = rproc_add(rproc);
> if (ret)
> - goto detach_pds;
> + goto remove_iris;
>
> - return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
> + return 0;
>
> +remove_iris:
> + qcom_iris_remove(wcnss->iris);
> detach_pds:
> wcnss_release_pds(wcnss);
> free_rproc:
> @@ -657,9 +653,10 @@ static int wcnss_remove(struct platform_device *pdev)
> {
> struct qcom_wcnss *wcnss = platform_get_drvdata(pdev);
>
> - of_platform_depopulate(&pdev->dev);
> + qcom_iris_remove(wcnss->iris);
>
> - qcom_smem_state_put(wcnss->state);
> + if (wcnss->state)
> + qcom_smem_state_put(wcnss->state);
> rproc_del(wcnss->rproc);
>
> qcom_remove_sysmon_subdev(wcnss->sysmon);
> @@ -687,28 +684,7 @@ static struct platform_driver wcnss_driver = {
> },
> };
>
> -static int __init wcnss_init(void)
> -{
> - int ret;
> -
> - ret = platform_driver_register(&wcnss_driver);
> - if (ret)
> - return ret;
> -
> - ret = platform_driver_register(&qcom_iris_driver);
> - if (ret)
> - platform_driver_unregister(&wcnss_driver);
> -
> - return ret;
> -}
> -module_init(wcnss_init);
> -
> -static void __exit wcnss_exit(void)
> -{
> - platform_driver_unregister(&qcom_iris_driver);
> - platform_driver_unregister(&wcnss_driver);
> -}
> -module_exit(wcnss_exit);
> +module_platform_driver(wcnss_driver);
>
> MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Wireless
> Subsystem");
> MODULE_LICENSE("GPL v2");
> diff --git a/drivers/remoteproc/qcom_wcnss.h b/drivers/remoteproc/qcom_wcnss.h
> index 62c8682d0a92..6d01ee6afa7f 100644
> --- a/drivers/remoteproc/qcom_wcnss.h
> +++ b/drivers/remoteproc/qcom_wcnss.h
> @@ -17,9 +17,9 @@ struct wcnss_vreg_info {
> bool super_turbo;
> };
>
> +struct qcom_iris *qcom_iris_probe(struct device *parent, bool *use_48mhz_xo);
> +void qcom_iris_remove(struct qcom_iris *iris);
> int qcom_iris_enable(struct qcom_iris *iris);
> void qcom_iris_disable(struct qcom_iris *iris);
>
> -void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss, struct qcom_iris
> *iris, bool use_48mhz_xo);
> -
> #endif
> diff --git a/drivers/remoteproc/qcom_wcnss_iris.c
> b/drivers/remoteproc/qcom_wcnss_iris.c
> index 169acd305ae3..09720ddddc85 100644
> --- a/drivers/remoteproc/qcom_wcnss_iris.c
> +++ b/drivers/remoteproc/qcom_wcnss_iris.c
> @@ -17,7 +17,7 @@
> #include "qcom_wcnss.h"
>
> struct qcom_iris {
> - struct device *dev;
> + struct device dev;
>
> struct clk *xo_clk;
>
> @@ -75,7 +75,7 @@ int qcom_iris_enable(struct qcom_iris *iris)
>
> ret = clk_prepare_enable(iris->xo_clk);
> if (ret) {
> - dev_err(iris->dev, "failed to enable xo clk\n");
> + dev_err(&iris->dev, "failed to enable xo clk\n");
> goto disable_regulators;
> }
>
> @@ -93,43 +93,90 @@ void qcom_iris_disable(struct qcom_iris *iris)
> regulator_bulk_disable(iris->num_vregs, iris->vregs);
> }
>
> -static int qcom_iris_probe(struct platform_device *pdev)
> +static const struct of_device_id iris_of_match[] = {
> + { .compatible = "qcom,wcn3620", .data = &wcn3620_data },
> + { .compatible = "qcom,wcn3660", .data = &wcn3660_data },
> + { .compatible = "qcom,wcn3660b", .data = &wcn3680_data },
> + { .compatible = "qcom,wcn3680", .data = &wcn3680_data },
> + {}
> +};
> +
> +static void qcom_iris_release(struct device *dev)
> +{
> + struct qcom_iris *iris = container_of(dev, struct qcom_iris, dev);
> +
> + of_node_put(iris->dev.of_node);
> + kfree(iris);
> +}
> +
> +struct qcom_iris *qcom_iris_probe(struct device *parent, bool *use_48mhz_xo)
> {
> + const struct of_device_id *match;
> const struct iris_data *data;
> - struct qcom_wcnss *wcnss;
> + struct device_node *of_node;
> struct qcom_iris *iris;
> int ret;
> int i;
>
> - iris = devm_kzalloc(&pdev->dev, sizeof(struct qcom_iris), GFP_KERNEL);
> - if (!iris)
> - return -ENOMEM;
> + of_node = of_get_child_by_name(parent->of_node, "iris");
> + if (!of_node) {
> + dev_err(parent, "No child node \"iris\" found\n");
> + return ERR_PTR(-EINVAL);
> + }
> +
> + iris = kzalloc(sizeof(*iris), GFP_KERNEL);
> + if (!iris) {
> + of_node_put(of_node);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + device_initialize(&iris->dev);
> + iris->dev.parent = parent;
> + iris->dev.release = qcom_iris_release;
> + iris->dev.of_node = of_node;
> +
> + dev_set_name(&iris->dev, "%s.iris", dev_name(parent));
> +
> + ret = device_add(&iris->dev);
> + if (ret) {
> + put_device(&iris->dev);
> + return ERR_PTR(ret);
> + }
> +
> + match = of_match_device(iris_of_match, &iris->dev);
> + if (!match) {
> + dev_err(&iris->dev, "no matching compatible for iris\n");
> + ret = -EINVAL;
> + goto err_device_del;
> + }
>
> - data = of_device_get_match_data(&pdev->dev);
> - wcnss = dev_get_drvdata(pdev->dev.parent);
> + data = match->data;
>
> - iris->xo_clk = devm_clk_get(&pdev->dev, "xo");
> + iris->xo_clk = devm_clk_get(&iris->dev, "xo");
> if (IS_ERR(iris->xo_clk)) {
> - if (PTR_ERR(iris->xo_clk) != -EPROBE_DEFER)
> - dev_err(&pdev->dev, "failed to acquire xo clk\n");
> - return PTR_ERR(iris->xo_clk);
> + ret = PTR_ERR(iris->xo_clk);
> + if (ret != -EPROBE_DEFER)
> + dev_err(&iris->dev, "failed to acquire xo clk\n");
> + goto err_device_del;
> }
>
> iris->num_vregs = data->num_vregs;
> - iris->vregs = devm_kcalloc(&pdev->dev,
> + iris->vregs = devm_kcalloc(&iris->dev,
> iris->num_vregs,
> sizeof(struct regulator_bulk_data),
> GFP_KERNEL);
> - if (!iris->vregs)
> - return -ENOMEM;
> + if (!iris->vregs) {
> + ret = -ENOMEM;
> + goto err_device_del;
> + }
>
> for (i = 0; i < iris->num_vregs; i++)
> iris->vregs[i].supply = data->vregs[i].name;
>
> - ret = devm_regulator_bulk_get(&pdev->dev, iris->num_vregs, iris->vregs);
> + ret = devm_regulator_bulk_get(&iris->dev, iris->num_vregs, iris->vregs);
> if (ret) {
> - dev_err(&pdev->dev, "failed to get regulators\n");
> - return ret;
> + dev_err(&iris->dev, "failed to get regulators\n");
> + goto err_device_del;
> }
>
> for (i = 0; i < iris->num_vregs; i++) {
> @@ -143,34 +190,17 @@ static int qcom_iris_probe(struct platform_device *pdev)
> data->vregs[i].load_uA);
> }
>
> - qcom_wcnss_assign_iris(wcnss, iris, data->use_48mhz_xo);
> -
> - return 0;
> -}
> + *use_48mhz_xo = data->use_48mhz_xo;
>
> -static int qcom_iris_remove(struct platform_device *pdev)
> -{
> - struct qcom_wcnss *wcnss = dev_get_drvdata(pdev->dev.parent);
> + return iris;
>
> - qcom_wcnss_assign_iris(wcnss, NULL, false);
> +err_device_del:
> + device_del(&iris->dev);
>
> - return 0;
> + return ERR_PTR(ret);
> }
>
> -static const struct of_device_id iris_of_match[] = {
> - { .compatible = "qcom,wcn3620", .data = &wcn3620_data },
> - { .compatible = "qcom,wcn3660", .data = &wcn3660_data },
> - { .compatible = "qcom,wcn3660b", .data = &wcn3680_data },
> - { .compatible = "qcom,wcn3680", .data = &wcn3680_data },
> - {}
> -};
> -MODULE_DEVICE_TABLE(of, iris_of_match);
> -
> -struct platform_driver qcom_iris_driver = {
> - .probe = qcom_iris_probe,
> - .remove = qcom_iris_remove,
> - .driver = {
> - .name = "qcom-iris",
> - .of_match_table = iris_of_match,
> - },
> -};
> +void qcom_iris_remove(struct qcom_iris *iris)
> +{
> + device_del(&iris->dev);
> +}
> --
> 2.29.2
>
