linux-kernel - [PATCH v2 01/20] PCI: imx6: Simplify imx7d_pcie_wait_for_phy_pll

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190104174925.17153-2-andrew.smirnov@gmail.com>
Date:   Fri,  4 Jan 2019 09:49:06 -0800
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-pci@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Leonard Crestez <leonard.crestez@....com>,
        "A.s. Dong" <aisheng.dong@....com>,
        Richard Zhu <hongxing.zhu@....com>, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/20] PCI: imx6: Simplify imx7d_pcie_wait_for_phy_pll_lock()

Make use of regmap_read_poll_timeout() to simplify
imx7d_pcie_wait_for_phy_pll_lock(). No functional change intended.

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Fabio Estevam <fabio.estevam@....com>
Cc: Chris Healy <cphealy@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Leonard Crestez <leonard.crestez@....com>
Cc: "A.s. Dong" <aisheng.dong@....com>
Cc: Richard Zhu <hongxing.zhu@....com>
Cc: linux-imx@....com
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-pci@...r.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 4380ee797c04..c73c7a6a4c55 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -86,9 +86,8 @@ struct imx6_pcie {
 };
 
 /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
-#define PHY_PLL_LOCK_WAIT_MAX_RETRIES	2000
-#define PHY_PLL_LOCK_WAIT_USLEEP_MIN	50
 #define PHY_PLL_LOCK_WAIT_USLEEP_MAX	200
+#define PHY_PLL_LOCK_WAIT_TIMEOUT	(2000 * PHY_PLL_LOCK_WAIT_USLEEP_MAX)
 
 /* PCIe Root Complex registers (memory-mapped) */
 #define PCIE_RC_LCR				0x7c
@@ -459,20 +458,14 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
 {
 	u32 val;
-	unsigned int retries;
 	struct device *dev = imx6_pcie->pci->dev;
 
-	for (retries = 0; retries < PHY_PLL_LOCK_WAIT_MAX_RETRIES; retries++) {
-		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR22, &val);
-
-		if (val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED)
-			return;
-
-		usleep_range(PHY_PLL_LOCK_WAIT_USLEEP_MIN,
-			     PHY_PLL_LOCK_WAIT_USLEEP_MAX);
-	}
-
-	dev_err(dev, "PCIe PLL lock timeout\n");
+	if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
+				     IOMUXC_GPR22, val,
+				     val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
+				     PHY_PLL_LOCK_WAIT_USLEEP_MAX,
+				     PHY_PLL_LOCK_WAIT_TIMEOUT))
+		dev_err(dev, "PCIe PLL lock timeout\n");
 }
 
 static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
-- 
2.20.1