Greg,
On Tue, Mar 12, 2013 at 03:43:54PM -0700, Greg Kroah-Hartman wrote:
> 3.4-stable review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Andrew Lunn <and...@lunn.ch>
>
> commit 89c58c198b252f2bc20657fdd72a2aea788c435c upstream.
>
> The Marvell RTC on Kirkwood makes use of the runit clock. Ensure the
> driver clk_prepare_enable() this clock, otherwise there is a danger
> the SoC will lockup when accessing RTC registers with the clock
> disabled.
>
> Reported-by: Simon Baatz <gmbno...@gmail.com>
> Signed-off-by: Andrew Lunn <and...@lunn.ch>
> Tested-by: Simon Baatz <gmbno...@gmail.com>
> Signed-off-by: Jason Cooper <ja...@lakedaemon.net>
> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
>
> ---
> arch/arm/boot/dts/kirkwood.dtsi | 1 +
> drivers/rtc/rtc-mv.c | 28 ++++++++++++++++++++++++----
> 2 files changed, 25 insertions(+), 4 deletions(-)
Please drop from 3.4-stable. devm_clk_get() wasn't available.
thx,
Jason.
>
> --- a/arch/arm/boot/dts/kirkwood.dtsi
> +++ b/arch/arm/boot/dts/kirkwood.dtsi
> @@ -31,6 +31,7 @@
> compatible = "mrvl,kirkwood-rtc", "mrvl,orion-rtc";
> reg = <0x10300 0x20>;
> interrupts = <53>;
> + clocks = <&gate_clk 7>;
> };
> };
> };
> --- a/drivers/rtc/rtc-mv.c
> +++ b/drivers/rtc/rtc-mv.c
> @@ -14,6 +14,7 @@
> #include <linux/platform_device.h>
> #include <linux/of.h>
> #include <linux/delay.h>
> +#include <linux/clk.h>
> #include <linux/gfp.h>
> #include <linux/module.h>
>
> @@ -41,6 +42,7 @@ struct rtc_plat_data {
> struct rtc_device *rtc;
> void __iomem *ioaddr;
> int irq;
> + struct clk *clk;
> };
>
> static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
> @@ -221,6 +223,7 @@ static int __devinit mv_rtc_probe(struct
> struct rtc_plat_data *pdata;
> resource_size_t size;
> u32 rtc_time;
> + int ret = 0;
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!res)
> @@ -239,11 +242,17 @@ static int __devinit mv_rtc_probe(struct
> if (!pdata->ioaddr)
> return -ENOMEM;
>
> + pdata->clk = devm_clk_get(&pdev->dev, NULL);
> + /* Not all SoCs require a clock.*/
> + if (!IS_ERR(pdata->clk))
> + clk_prepare_enable(pdata->clk);
> +
> /* make sure the 24 hours mode is enabled */
> rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
> if (rtc_time & RTC_HOURS_12H_MODE) {
> dev_err(&pdev->dev, "24 Hours mode not supported.\n");
> - return -EINVAL;
> + ret = -EINVAL;
> + goto out;
> }
>
> /* make sure it is actually functional */
> @@ -252,7 +261,8 @@ static int __devinit mv_rtc_probe(struct
> rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
> if (rtc_time == 0x01000000) {
> dev_err(&pdev->dev, "internal RTC not ticking\n");
> - return -ENODEV;
> + ret = -ENODEV;
> + goto out;
> }
> }
>
> @@ -268,8 +278,10 @@ static int __devinit mv_rtc_probe(struct
> } else
> pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
> &mv_rtc_ops, THIS_MODULE);
> - if (IS_ERR(pdata->rtc))
> - return PTR_ERR(pdata->rtc);
> + if (IS_ERR(pdata->rtc)) {
> + ret = PTR_ERR(pdata->rtc);
> + goto out;
> + }
>
> if (pdata->irq >= 0) {
> writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
> @@ -282,6 +294,11 @@ static int __devinit mv_rtc_probe(struct
> }
>
> return 0;
> +out:
> + if (!IS_ERR(pdata->clk))
> + clk_disable_unprepare(pdata->clk);
> +
> + return ret;
> }
>
> static int __exit mv_rtc_remove(struct platform_device *pdev)
> @@ -292,6 +309,9 @@ static int __exit mv_rtc_remove(struct p
> device_init_wakeup(&pdev->dev, 0);
>
> rtc_device_unregister(pdata->rtc);
> + if (!IS_ERR(pdata->clk))
> + clk_disable_unprepare(pdata->clk);
> +
> return 0;
> }
>
>
>
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