From 2e4ac7cc493f36e45facb921a992a145351d280c Mon Sep 17 00:00:00 2001 From: Kevin Wangtao Date: Mon, 3 Dec 2018 11:55:09 +0800 Subject: [PATCH] mailbox: Hi3660: Fixup mailbox state machine malfunction issue Current mailbox driver of Hi3660 release the mailbox directly before sending a new message which may cause last message lost and next message sending doesn't take effect actually. This patch fixs this issue by following the right progress below, each time before sending a message, mailbox driver will check whether the mailbox is in ready state, if last message has been acknowledged, the mailbox driver will clear the ack state to turn the mailbox to ready state again. Signed-off-by: Kevin Wangtao Reviewed-and-tested-by: Leo Yan Tested-by: Valentin Schneider Signed-off-by: Jassi Brar --- drivers/mailbox/hi3660-mailbox.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/mailbox/hi3660-mailbox.c b/drivers/mailbox/hi3660-mailbox.c index c3fd1f2..f9aed5d 100644 --- a/drivers/mailbox/hi3660-mailbox.c +++ b/drivers/mailbox/hi3660-mailbox.c @@ -38,6 +38,7 @@ #define MBOX_AUTOMATIC_ACK 1 #define MBOX_STATE_IDLE BIT(4) +#define MBOX_STATE_READY BIT(5) #define MBOX_STATE_ACK BIT(7) #define MBOX_MSG_LEN 8 @@ -91,8 +92,8 @@ static int hi3660_mbox_check_state(struct mbox_chan *chan) unsigned long val; unsigned int ret; - /* Mailbox is idle so directly bail out */ - if (readl(base + MBOX_MODE_REG) & MBOX_STATE_IDLE) + /* Mailbox is ready to use */ + if (readl(base + MBOX_MODE_REG) & MBOX_STATE_READY) return 0; /* Wait for acknowledge from remote */ @@ -103,9 +104,9 @@ static int hi3660_mbox_check_state(struct mbox_chan *chan) return ret; } - /* Ensure channel is released */ - writel(0xffffffff, base + MBOX_IMASK_REG); - writel(BIT(mchan->ack_irq), base + MBOX_SRC_REG); + /* clear ack state, mailbox will get back to ready state */ + writel(BIT(mchan->ack_irq), base + MBOX_ICLR_REG); + return 0; } @@ -160,10 +161,6 @@ static int hi3660_mbox_startup(struct mbox_chan *chan) { int ret; - ret = hi3660_mbox_check_state(chan); - if (ret) - return ret; - ret = hi3660_mbox_unlock(chan); if (ret) return ret; @@ -183,10 +180,11 @@ static int hi3660_mbox_send_data(struct mbox_chan *chan, void *msg) void __iomem *base = MBOX_BASE(mbox, ch); u32 *buf = msg; unsigned int i; + int ret; - /* Ensure channel is released */ - writel_relaxed(0xffffffff, base + MBOX_IMASK_REG); - writel_relaxed(BIT(mchan->ack_irq), base + MBOX_SRC_REG); + ret = hi3660_mbox_check_state(chan); + if (ret) + return ret; /* Clear mask for destination interrupt */ writel_relaxed(~BIT(mchan->dst_irq), base + MBOX_IMASK_REG); -- 2.7.4