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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
