On Thu, Aug 09, 2018 at 06:02:39PM +0530, Amit Kucheria wrote: > The SROT registers are initialised by the secure firmware at boot. We > don't have write access to the registers. Check if the block is enabled > before continuing. > Should this be merged to patch 6? > Signed-off-by: Amit Kucheria <amit.kucheria@xxxxxxxxxx> > --- > drivers/thermal/qcom/tsens-common.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c > index 0b8a793f15f4..d250b757d1f0 100644 > --- a/drivers/thermal/qcom/tsens-common.c > +++ b/drivers/thermal/qcom/tsens-common.c > @@ -12,6 +12,11 @@ > #include <linux/regmap.h> > #include "tsens.h" > > +/* SROT */ > +#define CTRL_OFFSET 0x4 > +#define TSENS_EN BIT(0) > + > +/* TM */ > #define STATUS_OFFSET 0x30 > #define SN_ADDR_OFFSET 0x4 > #define SN_ST_TEMP_MASK 0x3ff > @@ -119,6 +124,8 @@ int __init init_common(struct tsens_device *tmdev) > { > void __iomem *tm_base, *srot_base; > struct resource *res; > + u32 code; > + int ret; > struct platform_device *op = of_find_device_by_node(tmdev->dev->of_node); > > if (!op) > @@ -151,5 +158,15 @@ int __init init_common(struct tsens_device *tmdev) > if (IS_ERR(tmdev->tm_map)) > return PTR_ERR(tmdev->tm_map); > > + if (tmdev->srot_map) { > + ret = regmap_read(tmdev->srot_map, CTRL_OFFSET, &code); > + if (ret) > + return ret; > + if (!(code & TSENS_EN)) { > + dev_err(tmdev->dev, "tsens device is not enabled\n"); > + return -ENODEV; > + } > + } > + > return 0; > } > -- > 2.17.1 >