From: Samuel Holland <samuel@sholland.org>
To: Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
Jassi Brar <jassisinghbrar@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Ondrej Jirman <megous@megous.com>,
Vasily Khoruzhick <anarsoul@gmail.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com,
Samuel Holland <samuel@sholland.org>
Subject: [PATCH] mailbox: sun6i-msgbox: Remove unneeded FIFO status check
Date: Sat, 15 Feb 2020 00:19:53 -0600 [thread overview]
Message-ID: <20200215061953.55300-1-samuel@sholland.org> (raw)
In-Reply-To: <CABb+yY3T1cL+E6Y1tGb5cuKLSY5m_zi=VOx4AJzuX40TMOSQTw@mail.gmail.com>
A transmit FIFO can never be full, because the mailbox framework
waits until mbox->ops->last_tx_done() succeeds before sending the next
message. sun6i_msgbox_last_tx_done() ensures that the FIFO is empty.
Since the extra check here is unnecessary, remove it.
Signed-off-by: Samuel Holland <samuel@sholland.org>
---
drivers/mailbox/sun6i-msgbox.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/drivers/mailbox/sun6i-msgbox.c b/drivers/mailbox/sun6i-msgbox.c
index 15d6fd522dc5..ccecf2e5941d 100644
--- a/drivers/mailbox/sun6i-msgbox.c
+++ b/drivers/mailbox/sun6i-msgbox.c
@@ -106,12 +106,6 @@ static int sun6i_msgbox_send_data(struct mbox_chan *chan, void *data)
if (WARN_ON_ONCE(!(readl(mbox->regs + CTRL_REG(n)) & CTRL_TX(n))))
return 0;
- /* We cannot post a new message if the FIFO is full. */
- if (readl(mbox->regs + FIFO_STAT_REG(n)) & FIFO_STAT_MASK) {
- mbox_dbg(mbox, "Channel %d busy sending 0x%08x\n", n, msg);
- return -EBUSY;
- }
-
writel(msg, mbox->regs + MSG_DATA_REG(n));
mbox_dbg(mbox, "Channel %d sent 0x%08x\n", n, msg);
--
2.24.1
next prev parent reply other threads:[~2020-02-15 6:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-13 5:18 [PATCH v6 0/6] Allwinner sun6i message box support Samuel Holland
2020-01-13 5:18 ` [PATCH v6 1/6] dt-bindings: mailbox: Add a sun6i message box binding Samuel Holland
2020-01-13 9:30 ` Maxime Ripard
2020-01-13 22:38 ` Rob Herring
2020-01-13 5:18 ` [PATCH v6 2/6] mailbox: sun6i-msgbox: Add a new mailbox driver Samuel Holland
2020-01-13 9:15 ` Philipp Zabel
2020-02-13 2:02 ` Jassi Brar
2020-02-13 2:18 ` Samuel Holland
2020-02-15 3:48 ` Samuel Holland
2020-02-15 4:47 ` Jassi Brar
2020-02-15 6:19 ` Samuel Holland [this message]
2020-01-13 5:18 ` [PATCH v6 3/6] ARM: dts: sunxi: a83t: Add msgbox node Samuel Holland
2020-01-13 5:18 ` [PATCH v6 4/6] ARM: dts: sunxi: h3/h5: " Samuel Holland
2020-01-13 5:18 ` [PATCH v6 5/6] arm64: dts: allwinner: a64: " Samuel Holland
2020-01-13 5:18 ` [PATCH v6 6/6] arm64: dts: allwinner: h6: " Samuel Holland
2020-02-13 1:43 ` [PATCH v6 0/6] Allwinner sun6i message box support Samuel Holland
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