linux-kernel - [PATCH] bus: ocp2scp: SYNC2 value should be changed to 0x6

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Date:	Wed, 14 May 2014 14:19:33 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<arnd@...db.de>, <tony@...mide.com>, <balbi@...com>,
	<linux-kernel@...r.kernel.org>
CC:	<kishon@...com>
Subject: [PATCH] bus: ocp2scp: SYNC2 value should be changed to 0x6

Read path of OCP2SCP is not working properly due to low reset value
of SYNC2 parameter in OCP2SCP. So changed the SYNC2 value to 0x6.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/bus/omap-ocp2scp.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/bus/omap-ocp2scp.c b/drivers/bus/omap-ocp2scp.c
index 5511f98..0a974b2 100644
--- a/drivers/bus/omap-ocp2scp.c
+++ b/drivers/bus/omap-ocp2scp.c
@@ -16,6 +16,7 @@
  *
  */
 
+#include <linux/io.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/err.h>
@@ -23,6 +24,9 @@
 #include <linux/of.h>
 #include <linux/of_platform.h>
 
+#define	OCP2SCP_TIMING	0x18
+#define	SYNC2_MASK	0xf
+
 static int ocp2scp_remove_devices(struct device *dev, void *c)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -35,6 +39,9 @@ static int ocp2scp_remove_devices(struct device *dev, void *c)
 static int omap_ocp2scp_probe(struct platform_device *pdev)
 {
 	int ret;
+	u32 reg;
+	void __iomem *regs;
+	struct resource *res;
 	struct device_node *np = pdev->dev.of_node;
 
 	if (np) {
@@ -46,8 +53,24 @@ static int omap_ocp2scp_probe(struct platform_device *pdev)
 		}
 	}
 
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
 	pm_runtime_enable(&pdev->dev);
 
+	/*
+	 * Read path of OCP2SCP is not working properly due to low reset value
+	 * of SYNC2 parameter in OCP2SCP. Suggested reset value is 0x6.
+	 */
+	pm_runtime_get_sync(&pdev->dev);
+	reg = readl(regs + OCP2SCP_TIMING);
+	reg &= ~(SYNC2_MASK);
+	reg |= 0x6;
+	writel(reg, regs + OCP2SCP_TIMING);
+	pm_runtime_put_sync(&pdev->dev);
+
 	return 0;
 
 err0:
-- 
1.7.9.5

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