linux-kernel - [PATCH 4.19 26/86] fpga: dfl: fix bug in port reset handshake

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Date:   Mon, 27 Jul 2020 16:04:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Xu Yilun <yilun.xu@...el.com>, Wu Hao <hao.wu@...el.com>,
        Tom Rix <trix@...hat.com>, Moritz Fischer <mdf@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 26/86] fpga: dfl: fix bug in port reset handshake

From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>

[ Upstream commit 8614afd689df59d9ce019439389be20bd788a897 ]

When putting the port in reset, driver must wait for the soft reset
acknowledgment bit instead of the soft reset bit.

Fixes: 47c1b19c160f (fpga: dfl: afu: add port ops support)
Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Signed-off-by: Xu Yilun <yilun.xu@...el.com>
Acked-by: Wu Hao <hao.wu@...el.com>
Reviewed-by: Tom Rix <trix@...hat.com>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/fpga/dfl-afu-main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index 02baa6a227c0c..fc048f9a99b19 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -79,7 +79,8 @@ static int port_disable(struct platform_device *pdev)
 	 * on this port and minimum soft reset pulse width has elapsed.
 	 * Driver polls port_soft_reset_ack to determine if reset done by HW.
 	 */
-	if (readq_poll_timeout(base + PORT_HDR_CTRL, v, v & PORT_CTRL_SFTRST,
+	if (readq_poll_timeout(base + PORT_HDR_CTRL, v,
+			       v & PORT_CTRL_SFTRST_ACK,
 			       RST_POLL_INVL, RST_POLL_TIMEOUT)) {
 		dev_err(&pdev->dev, "timeout, fail to reset device\n");
 		return -ETIMEDOUT;
-- 
2.25.1