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authorBibby Hsieh <bibby.hsieh@mediatek.com>2020-02-17 12:05:31 +0300
committerJassi Brar <jaswinder.singh@linaro.org>2020-03-20 07:00:32 +0300
commitb0524f7c963532c1cd33ba5d89e813d5763160d0 (patch)
tree88d113af184c89922ef262dd5c488e45b533ecf0 /drivers/mailbox
parent19d8e335d58a961a7ed377e5e2e63664b92c0b9c (diff)
downloadlinux-b0524f7c963532c1cd33ba5d89e813d5763160d0.tar.xz
mailbox: mediatek: implement flush function
For client driver which need to reorganize the command buffer, it could use this function to flush the send command buffer. If the channel doesn't be started (usually in waiting for event), this function will abort it directly. Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com> Reviewed-by: CK Hu <ck.hu@mediatek.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox')
-rw-r--r--drivers/mailbox/mtk-cmdq-mailbox.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 9a6ce9f5a7db..0da5e2dc2c0e 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -432,10 +432,62 @@ static void cmdq_mbox_shutdown(struct mbox_chan *chan)
{
}
+static int cmdq_mbox_flush(struct mbox_chan *chan, unsigned long timeout)
+{
+ struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
+ struct cmdq_task_cb *cb;
+ struct cmdq_cb_data data;
+ struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
+ struct cmdq_task *task, *tmp;
+ unsigned long flags;
+ u32 enable;
+
+ spin_lock_irqsave(&thread->chan->lock, flags);
+ if (list_empty(&thread->task_busy_list))
+ goto out;
+
+ WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
+ if (!cmdq_thread_is_in_wfe(thread))
+ goto wait;
+
+ list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
+ list_entry) {
+ cb = &task->pkt->async_cb;
+ if (cb->cb) {
+ data.sta = CMDQ_CB_ERROR;
+ data.data = cb->data;
+ cb->cb(data);
+ }
+ list_del(&task->list_entry);
+ kfree(task);
+ }
+
+ cmdq_thread_resume(thread);
+ cmdq_thread_disable(cmdq, thread);
+ clk_disable(cmdq->clock);
+
+out:
+ spin_unlock_irqrestore(&thread->chan->lock, flags);
+ return 0;
+
+wait:
+ cmdq_thread_resume(thread);
+ spin_unlock_irqrestore(&thread->chan->lock, flags);
+ if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_ENABLE_TASK,
+ enable, enable == 0, 1, timeout)) {
+ dev_err(cmdq->mbox.dev, "Fail to wait GCE thread 0x%x done\n",
+ (u32)(thread->base - cmdq->base));
+
+ return -EFAULT;
+ }
+ return 0;
+}
+
static const struct mbox_chan_ops cmdq_mbox_chan_ops = {
.send_data = cmdq_mbox_send_data,
.startup = cmdq_mbox_startup,
.shutdown = cmdq_mbox_shutdown,
+ .flush = cmdq_mbox_flush,
};
static struct mbox_chan *cmdq_xlate(struct mbox_controller *mbox,