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[02/19] thunderbolt: Optimize NHI LC mailbox command processing

Message ID 20200819115905.59834-3-mika.westerberg@linux.intel.com (mailing list archive)
State Accepted
Commit 6651c91de042f8ad601b522cb8d33de84246ddc7
Headers show
Series thunderbolt: Power Management improvements | expand

Commit Message

Mika Westerberg Aug. 19, 2020, 11:58 a.m. UTC 
From: Rajmohan Mani <rajmohan.mani@intel.com>

Currently the Ice Lake and Tiger Lake NHI (host controller) LC (link
controller) mailbox command processing checks for the completion of
command every 100 msecs. These controllers are found to complete this in
the order of 1 ms or so. Since this delay is in suspend path, surplus
delay is effectively affecting runtime PM suspend flows.

Optimize this so that we do the wait for 1 ms after reading the mailbox
register. This should make Ice Lake and Tiger Lake runtime suspend take
less time to complete.

Reported-by: Dana Alkattan <dana.alkattan@intel.com>
Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/thunderbolt/nhi_ops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/thunderbolt/nhi_ops.c b/drivers/thunderbolt/nhi_ops.c
index c0d5ccbb10f5..28583f9faf46 100644
--- a/drivers/thunderbolt/nhi_ops.c
+++ b/drivers/thunderbolt/nhi_ops.c
@@ -97,7 +97,7 @@  static int icl_nhi_lc_mailbox_cmd_complete(struct tb_nhi *nhi, int timeout)
 		pci_read_config_dword(nhi->pdev, VS_CAP_18, &data);
 		if (data & VS_CAP_18_DONE)
 			goto clear;
-		msleep(100);
+		usleep_range(1000, 1100);
 	} while (time_before(jiffies, end));
 
 	return -ETIMEDOUT;