linux-kernel - [PATCH v2] PCI: dwc: Use the correct sleep function in wait_for

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Message-Id: <20240215-topic-pci_sleep-v2-1-79334884546b@linaro.org>
Date: Wed, 27 Mar 2024 19:24:49 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Jingoo Han <jingoohan1@...il.com>, 
 Gustavo Pimentel <gustavo.pimentel@...opsys.com>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Johan Hovold <johan+linaro@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v2] PCI: dwc: Use the correct sleep function in
 wait_for_link

According to [1], msleep should be used for large sleeps, such as the
100-ish ms one in this function. Comply with the guide and use it.

[1] https://www.kernel.org/doc/Documentation/timers/timers-howto.txt

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
Tested on Qualcomm SC8280XP CRD
---
Changes in v2:
- Rename the define
- Sleep for 90ms (the lower boundary) instead of 100
- Link to v1: https://lore.kernel.org/r/20240215-topic-pci_sleep-v1-1-7ac79ac9739a@linaro.org
---
 drivers/pci/controller/dwc/pcie-designware.c | 2 +-
 drivers/pci/controller/dwc/pcie-designware.h | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 250cf7f40b85..62915e4b2ebd 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -655,7 +655,7 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci)
 		if (dw_pcie_link_up(pci))
 			break;
 
-		usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
+		msleep(LINK_WAIT_SLEEP_MS);
 	}
 
 	if (retries >= LINK_WAIT_MAX_RETRIES) {
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 26dae4837462..b17e8ff54f55 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -63,8 +63,7 @@
 
 /* Parameters for the waiting for link up routine */
 #define LINK_WAIT_MAX_RETRIES		10
-#define LINK_WAIT_USLEEP_MIN		90000
-#define LINK_WAIT_USLEEP_MAX		100000
+#define LINK_WAIT_SLEEP_MS		90
 
 /* Parameters for the waiting for iATU enabled routine */
 #define LINK_WAIT_MAX_IATU_RETRIES	5

---
base-commit: 26074e1be23143b2388cacb36166766c235feb7c
change-id: 20240215-topic-pci_sleep-368108a1fb6f

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@...aro.org>