From: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
To: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Jassi Brar <jassisinghbrar@gmail.com>,
Bibby Hsieh <bibby.hsieh@mediatek.com>,
CK Hu <ck.hu@mediatek.com>
Cc: <devicetree@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <wsd_upstream@mediatek.com>,
Houlong Wei <houlong.wei@mediatek.com>,
HS Liao <hs.liao@mediatek.com>,
Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
Subject: [PATCH v7 4/4] mailbox: mediatek: cmdq: clear task in channel before shutdown
Date: Sun, 21 Jun 2020 21:22:11 +0800 [thread overview]
Message-ID: <1592745731-14614-5-git-send-email-dennis-yc.hsieh@mediatek.com> (raw)
In-Reply-To: <1592745731-14614-1-git-send-email-dennis-yc.hsieh@mediatek.com>
Do success callback in channel when shutdown. For those task not finish,
callback with error code thus client has chance to cleanup or reset.
Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
drivers/mailbox/mtk-cmdq-mailbox.c | 38 ++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 9994ac9426d6..b56d340c8982 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -387,6 +387,12 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
if (list_empty(&thread->task_busy_list)) {
WARN_ON(clk_enable(cmdq->clock) < 0);
+ /*
+ * The thread reset will clear thread related register to 0,
+ * including pc, end, priority, irq, suspend and enable. Thus
+ * set CMDQ_THR_ENABLED to CMDQ_THR_ENABLE_TASK will enable
+ * thread and make it running.
+ */
WARN_ON(cmdq_thread_reset(cmdq, thread) < 0);
writel(task->pa_base >> cmdq->shift_pa,
@@ -450,6 +456,38 @@ static int cmdq_mbox_startup(struct mbox_chan *chan)
static void cmdq_mbox_shutdown(struct mbox_chan *chan)
{
+ struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
+ struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
+ struct cmdq_task *task, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&thread->chan->lock, flags);
+ if (list_empty(&thread->task_busy_list))
+ goto done;
+
+ WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
+
+ /* make sure executed tasks have success callback */
+ cmdq_thread_irq_handler(cmdq, thread);
+ if (list_empty(&thread->task_busy_list))
+ goto done;
+
+ list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
+ list_entry) {
+ cmdq_task_exec_done(task, CMDQ_CB_ERROR);
+ kfree(task);
+ }
+
+ cmdq_thread_disable(cmdq, thread);
+ clk_disable(cmdq->clock);
+done:
+ /*
+ * The thread->task_busy_list empty means thread already disable. The
+ * cmdq_mbox_send_data() always reset thread which clear disable and
+ * suspend statue when first pkt send to channel, so there is no need
+ * to do any operation here, only unlock and leave.
+ */
+ spin_unlock_irqrestore(&thread->chan->lock, flags);
}
static const struct mbox_chan_ops cmdq_mbox_chan_ops = {
--
1.7.9.5
next prev parent reply other threads:[~2020-06-21 13:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-21 13:22 [PATCH v7 0/4] support gce on mt6779 platform Dennis YC Hsieh
2020-06-21 13:22 ` [PATCH v7 1/4] dt-binding: gce: add gce header file for mt6779 Dennis YC Hsieh
2020-06-22 2:35 ` Bibby Hsieh
2020-06-21 13:22 ` [PATCH v7 2/4] mailbox: cmdq: variablize address shift in platform Dennis YC Hsieh
2020-06-22 2:33 ` Bibby Hsieh
2020-06-22 15:19 ` Dennis-YC Hsieh
2020-06-21 13:22 ` [PATCH v7 3/4] mailbox: cmdq: support mt6779 gce platform definition Dennis YC Hsieh
2020-06-22 2:35 ` Bibby Hsieh
2020-06-21 13:22 ` Dennis YC Hsieh [this message]
2020-06-22 2:36 ` [PATCH v7 4/4] mailbox: mediatek: cmdq: clear task in channel before shutdown Bibby Hsieh
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