Hi, Dennis:
On Tue, 2020-03-03 at 18:58 +0800, Dennis YC Hsieh wrote:
> Do success callback in channel when shutdown. For those task not finish,
> callback with error code thus client has chance to cleanup or reset.
>
Reviewed-by: CK Hu <ck...@mediatek.com>
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hs...@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 = {
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