[PATCH AUTOSEL 5.4 017/108] NTB: set peer_sta within event handler itself

Sasha Levin
2020-04-11T23:32:32Z

From: Arindam Nath <arindam.nath@amd.com>

[ Upstream commit 2465b87ce36ea2dbd97e5fb58a0efd284c9f687e ]

amd_ack_smu() should only set the corresponding
bits into SMUACK register. Setting the bitmask
of peer_sta should be done within the event handler.
They are two different things, and so should be
handled differently and at different places.

Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/ntb/hw/amd/ntb_hw_amd.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index 156c2a18a2394..ecbc283f094b9 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -493,8 +493,6 @@ static void amd_ack_smu(struct amd_ntb_dev *ndev, u32 bit)
reg = readl(mmio + AMD_SMUACK_OFFSET);
reg |= bit;
writel(reg, mmio + AMD_SMUACK_OFFSET);
-
- ndev->peer_sta |= bit;
}

static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
@@ -512,9 +510,11 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
status &= AMD_EVENT_INTMASK;
switch (status) {
case AMD_PEER_FLUSH_EVENT:
+ ndev->peer_sta |= AMD_PEER_FLUSH_EVENT;
dev_info(dev, "Flush is done.\n");
break;
case AMD_PEER_RESET_EVENT:
+ ndev->peer_sta |= AMD_PEER_RESET_EVENT;
amd_ack_smu(ndev, AMD_PEER_RESET_EVENT);

/* link down first */
@@ -527,6 +527,7 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
case AMD_PEER_PMETO_EVENT:
case AMD_LINK_UP_EVENT:
case AMD_LINK_DOWN_EVENT:
+ ndev->peer_sta |= status;
amd_ack_smu(ndev, status);

/* link down */
@@ -540,6 +541,7 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
if (status & 0x1)
dev_info(dev, "Wakeup is done.\n");

+ ndev->peer_sta |= AMD_PEER_D0_EVENT;
amd_ack_smu(ndev, AMD_PEER_D0_EVENT);

/* start a timer to poll link status */
--
2.20.1