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fpga: dfl: fix bug in port reset handshake 

[ Upstream commit 8614afd689 ]

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

Fixes: 47c1b19c16 (fpga: dfl: afu: add port ops support)
Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Matthew Gerlach 2020-07-13 14:10:03 +08:00 committed by Greg Kroah-Hartman
parent c731882958
commit 570b1c92cb
1 changed files with 2 additions and 1 deletions
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3
drivers/fpga/dfl-afu-main.c
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@ -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;