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Date: Tue, 20 Jul 2021 04:30:30 +0000
From: Yassine Oudjana <y.oudjana@...tonmail.com>
To: "srinivas.kandagatla@...aro.org" <srinivas.kandagatla@...aro.org>,
"srini@...nel.org" <srini@...nel.org>
Cc: "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"sidgup@...eaurora.org" <sidgup@...eaurora.org>
Subject: Re: [PATCH 1/2] slimbus: qcom-ngd-ctrl: add Sub System Restart support
In-Reply-To: <20201118170246.16588-2-srinivas.kandagatla@...aro.org>
On Wed, 18 Nov 2020 17:02:45 +0000, Srinivas Kandagatla wrote:
> This patch adds SSR(SubSystem Restart) support which includes, synchronisation
> between SSR and QMI server notifications. Also with this patch now NGD is taken
> down by SSR instead of QMI server down notification.
>
> NGD up path now relies on both SSR and QMI notifications and particularly
> sequence of SSR up followed by QMI server up notification.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
> drivers/slimbus/Kconfig | 1 +
> drivers/slimbus/qcom-ngd-ctrl.c | 97 +++++++++++++++++++++++++++++++--
> 2 files changed, 94 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/slimbus/Kconfig b/drivers/slimbus/Kconfig
> index 8cd595148d17..7c950948a9ec 100644
> --- a/drivers/slimbus/Kconfig
> +++ b/drivers/slimbus/Kconfig
> @@ -25,6 +25,7 @@ config SLIM_QCOM_NGD_CTRL
> depends on HAS_IOMEM && DMA_ENGINE && NET
> depends on ARCH_QCOM || COMPILE_TEST
> select QCOM_QMI_HELPERS
> + select QCOM_RPROC_COMMON
> help
> Select driver if Qualcomm's SLIMbus Satellite Non-Generic Device
> Component is programmed using Linux kernel.
> diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
> index 218aefc3531c..f62693653d2b 100644
> --- a/drivers/slimbus/qcom-ngd-ctrl.c
> +++ b/drivers/slimbus/qcom-ngd-ctrl.c
> @@ -13,6 +13,9 @@
> #include <linux/slimbus.h>
> #include <linux/delay.h>
> #include <linux/pm_runtime.h>
> +#include <linux/mutex.h>
> +#include <linux/notifier.h>
> +#include <linux/remoteproc/qcom_rproc.h>
> #include <linux/of.h>
> #include <linux/io.h>
> #include <linux/soc/qcom/qmi.h>
> @@ -155,8 +158,14 @@ struct qcom_slim_ngd_ctrl {
> struct qcom_slim_ngd_dma_desc txdesc[QCOM_SLIM_NGD_DESC_NUM];
> struct completion reconf;
> struct work_struct m_work;
> + struct work_struct ngd_up_work;
> struct workqueue_struct *mwq;
> + struct completion qmi_up;
> spinlock_t tx_buf_lock;
> + struct mutex tx_lock;
> + struct mutex ssr_lock;
> + struct notifier_block nb;
> + void *notifier;
> enum qcom_slim_ngd_state state;
> dma_addr_t rx_phys_base;
> dma_addr_t tx_phys_base;
> @@ -868,14 +877,18 @@ static int qcom_slim_ngd_xfer_msg(struct slim_controller *sctrl,
> if (txn->msg && txn->msg->wbuf)
> memcpy(puc, txn->msg->wbuf, txn->msg->num_bytes);
>
> + mutex_lock(&ctrl->tx_lock);
> ret = qcom_slim_ngd_tx_msg_post(ctrl, pbuf, txn->rl);
> - if (ret)
> + if (ret) {
> + mutex_unlock(&ctrl->tx_lock);
> return ret;
> + }
>
> timeout = wait_for_completion_timeout(&tx_sent, HZ);
> if (!timeout) {
> dev_err(sctrl->dev, "TX timed out:MC:0x%x,mt:0x%x", txn->mc,
> txn->mt);
> + mutex_unlock(&ctrl->tx_lock);
> return -ETIMEDOUT;
> }
>
> @@ -884,10 +897,12 @@ static int qcom_slim_ngd_xfer_msg(struct slim_controller *sctrl,
> if (!timeout) {
> dev_err(sctrl->dev, "TX timed out:MC:0x%x,mt:0x%x",
> txn->mc, txn->mt);
> + mutex_unlock(&ctrl->tx_lock);
> return -ETIMEDOUT;
> }
> }
>
> + mutex_unlock(&ctrl->tx_lock);
> return 0;
> }
>
> @@ -1200,6 +1215,13 @@ static void qcom_slim_ngd_master_worker(struct work_struct *work)
> }
> }
>
> +static int qcom_slim_ngd_update_device_status(struct device *dev, void *null)
> +{
> + slim_report_absent(to_slim_device(dev));
> +
> + return 0;
> +}
> +
> static int qcom_slim_ngd_runtime_resume(struct device *dev)
> {
> struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev);
> @@ -1267,7 +1289,7 @@ static int qcom_slim_ngd_qmi_new_server(struct qmi_handle *hdl,
> qmi->svc_info.sq_node = service->node;
> qmi->svc_info.sq_port = service->port;
>
> - qcom_slim_ngd_enable(ctrl, true);
> + complete(&ctrl->qmi_up);
>
> return 0;
> }
> @@ -1280,10 +1302,9 @@ static void qcom_slim_ngd_qmi_del_server(struct qmi_handle *hdl,
> struct qcom_slim_ngd_ctrl *ctrl =
> container_of(qmi, struct qcom_slim_ngd_ctrl, qmi);
>
> + reinit_completion(&ctrl->qmi_up);
> qmi->svc_info.sq_node = 0;
> qmi->svc_info.sq_port = 0;
> -
> - qcom_slim_ngd_enable(ctrl, false);
> }
>
> static struct qmi_ops qcom_slim_ngd_qmi_svc_event_ops = {
> @@ -1333,6 +1354,64 @@ static const struct of_device_id qcom_slim_ngd_dt_match[] = {
>
> MODULE_DEVICE_TABLE(of, qcom_slim_ngd_dt_match);
>
> +static void qcom_slim_ngd_down(struct qcom_slim_ngd_ctrl *ctrl)
> +{
> + mutex_lock(&ctrl->ssr_lock);
> + device_for_each_child(ctrl->ctrl.dev, NULL,
> + qcom_slim_ngd_update_device_status);
> + qcom_slim_ngd_enable(ctrl, false);
> + mutex_unlock(&ctrl->ssr_lock);
> +}
> +
> +static void qcom_slim_ngd_up_worker(struct work_struct *work)
> +{
> + struct qcom_slim_ngd_ctrl *ctrl;
> +
> + ctrl = container_of(work, struct qcom_slim_ngd_ctrl, ngd_up_work);
> +
> + /* Make sure qmi service is up before continuing */
> + wait_for_completion_interruptible(&ctrl->qmi_up);
> +
> + mutex_lock(&ctrl->ssr_lock);
> + qcom_slim_ngd_enable(ctrl, true);
> + mutex_unlock(&ctrl->ssr_lock);
> +}
> +
> +static int qcom_slim_ngd_ssr_pdr_notify(struct qcom_slim_ngd_ctrl *ctrl,
> + unsigned long action)
> +{
> + switch (action) {
> + case QCOM_SSR_BEFORE_SHUTDOWN:
> + /* Make sure the last dma xfer is finished */
> + mutex_lock(&ctrl->tx_lock);
> + if (ctrl->state != QCOM_SLIM_NGD_CTRL_DOWN) {
> + pm_runtime_get_noresume(ctrl->dev);
> + ctrl->state = QCOM_SLIM_NGD_CTRL_DOWN;
> + qcom_slim_ngd_down(ctrl);
> + qcom_slim_ngd_exit_dma(ctrl);
> + }
> + mutex_unlock(&ctrl->tx_lock);
> + break;
> + case QCOM_SSR_AFTER_POWERUP:
> + schedule_work(&ctrl->ngd_up_work);
> + break;
> + default:
> + break;
> + }
> +
> + return NOTIFY_OK;
> +}
> +
> +static int qcom_slim_ngd_ssr_notify(struct notifier_block *nb,
> + unsigned long action,
> + void *data)
> +{
> + struct qcom_slim_ngd_ctrl *ctrl = container_of(nb,
> + struct qcom_slim_ngd_ctrl, nb);
> +
> + return qcom_slim_ngd_ssr_pdr_notify(ctrl, action);
> +}
> +
> static int of_qcom_slim_ngd_register(struct device *parent,
> struct qcom_slim_ngd_ctrl *ctrl)
> {
> @@ -1397,6 +1476,7 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev)
> }
>
> INIT_WORK(&ctrl->m_work, qcom_slim_ngd_master_worker);
> + INIT_WORK(&ctrl->ngd_up_work, qcom_slim_ngd_up_worker);
> ctrl->mwq = create_singlethread_workqueue("ngd_master");
> if (!ctrl->mwq) {
> dev_err(&pdev->dev, "Failed to start master worker\n");
> @@ -1444,6 +1524,11 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
> return ret;
> }
>
> + ctrl->nb.notifier_call = qcom_slim_ngd_ssr_notify;
> + ctrl->notifier = qcom_register_ssr_notifier("lpass", &ctrl->nb);
> + if (IS_ERR(ctrl->notifier))
> + return PTR_ERR(ctrl->notifier);
> +
> ctrl->dev = dev;
> ctrl->framer.rootfreq = SLIM_ROOT_FREQ >> 3;
> ctrl->framer.superfreq =
> @@ -1457,9 +1542,12 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
> ctrl->ctrl.wakeup = NULL;
> ctrl->state = QCOM_SLIM_NGD_CTRL_DOWN;
>
> + mutex_init(&ctrl->tx_lock);
> + mutex_init(&ctrl->ssr_lock);
> spin_lock_init(&ctrl->tx_buf_lock);
> init_completion(&ctrl->reconf);
> init_completion(&ctrl->qmi.qmi_comp);
> + init_completion(&ctrl->qmi_up);
>
> platform_driver_register(&qcom_slim_ngd_driver);
> return of_qcom_slim_ngd_register(dev, ctrl);
> @@ -1477,6 +1565,7 @@ static int qcom_slim_ngd_remove(struct platform_device *pdev)
> struct qcom_slim_ngd_ctrl *ctrl = platform_get_drvdata(pdev);
>
> pm_runtime_disable(&pdev->dev);
> + qcom_unregister_ssr_notifier(ctrl->notifier, &ctrl->nb);
> qcom_slim_ngd_enable(ctrl, false);
> qcom_slim_ngd_exit_dma(ctrl);
> qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi);
> --
> 2.21.0
This makes NGD never come up if probed after ADSP is powered on since it registers its SSR notifier
after ADSP sent its after powerup notification.
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