This is a note to let you know that I've just added the patch titled
fpga: dfl: fix bug in port reset handshake
to the 5.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fpga-dfl-fix-bug-in-port-reset-handshake.patch
and it can be found in the queue-5.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 59fe7a8f5ac11e7ff987c3253312f34cfa3e3bec
Author: Matthew Gerlach <matthew.gerlach@xxxxxxxxxxxxxxx>
Date: Mon Jul 13 14:10:03 2020 +0800
fpga: dfl: fix bug in port reset handshake
[ 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@xxxxxxxxxxxxxxx>
Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxx>
Acked-by: Wu Hao <hao.wu@xxxxxxxxx>
Reviewed-by: Tom Rix <trix@xxxxxxxxxx>
Signed-off-by: Moritz Fischer <mdf@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index 65437b6a68424..77e257c88a1df 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -83,7 +83,8 @@ int __afu_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;
