linux-kernel - [PATCH v2 3/7] PCI: rcar-host: Replace msleep(1) with fsleep() for precise speed change monitoring

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Message-Id: <20250822155908.625553-4-18255117159@163.com>
Date: Fri, 22 Aug 2025 23:59:04 +0800
From: Hans Zhang <18255117159@....com>
To: bhelgaas@...gle.com,
	helgaas@...nel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Hans Zhang <18255117159@....com>
Subject: [PATCH v2 3/7] PCI: rcar-host: Replace msleep(1) with fsleep() for precise speed change monitoring

The msleep(1) in rcar_pcie_force_speedup() may sleep longer than intended
due to timer granularity, which can cause unnecessary delays in PCIe speed
change detection. Replace it with fsleep() for a more precise delay of
exactly 1ms.

Signed-off-by: Hans Zhang <18255117159@....com>
---
 drivers/pci/controller/pcie-rcar-host.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index fe288fd770c4..5651285f1fb2 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -34,6 +34,8 @@
 
 #include "pcie-rcar.h"
 
+#define RCAR_SPEED_CHANGE_CHECK_US	1000
+
 struct rcar_msi {
 	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
 	struct irq_domain *domain;
@@ -339,7 +341,7 @@ static void rcar_pcie_force_speedup(struct rcar_pcie *pcie)
 			goto done;
 		}
 
-		msleep(1);
+		fsleep(RCAR_SPEED_CHANGE_CHECK_US);
 	}
 
 	dev_err(dev, "Speed change timed out\n");
-- 
2.25.1