fixup! mailbox: add support for ARM Message Handling Unit(MHU) controller

TODO:
Yet to identify on what paths we need to clear the RX status if the
protocol timed out and frees the channel. For now have it in startup,
shutdown and interrupt...

diff --git a/drivers/mailbox/arm_mhu.c b/drivers/mailbox/arm_mhu.c
index 158cba4..3c1aaef 100644 (file)
--- a/drivers/mailbox/arm_mhu.c
+++ b/drivers/mailbox/arm_mhu.c
@@ -128,8 +128,10 @@ static irqreturn_t mbox_handler(int irq, void *p)
 
        if (status && irq == chan->rx_irq) {
                struct mhu_data_buf *data = chan->data;
-               if (!data)
+               if (!data) {
+                       writel(~0, ctlr->mbox_base + RX_CLEAR(idx));
                        return IRQ_NONE;        /* spurious */
+               }
                if (data->rx_buf)
                        memcpy(data->rx_buf,
                               ctlr->payload_base + RX_PAYLOAD(idx),
@@ -163,8 +165,10 @@ static int mhu_send_data(struct mbox_link *link, void *msg)
 static int mhu_startup(struct mbox_link *link, void *ignored)
 {
        struct mhu_chan *chan = to_mhu_chan(link);
+       struct mhu_ctlr *ctlr = chan->ctlr;
 
        chan->data = NULL;
+       writel(~0, ctlr->mbox_base + RX_CLEAR(chan->index));
        return request_threaded_irq(chan->rx_irq, NULL, mbox_handler,
                                    IRQF_ONESHOT, link->link_name, link);
 }
@@ -172,8 +176,10 @@ static int mhu_startup(struct mbox_link *link, void *ignored)
 static void mhu_shutdown(struct mbox_link *link)
 {
        struct mhu_chan *chan = to_mhu_chan(link);
+       struct mhu_ctlr *ctlr = chan->ctlr;
 
        chan->data = NULL;
+       writel(~0, ctlr->mbox_base + RX_CLEAR(chan->index));
        free_irq(chan->rx_irq, link);
 }