From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eduardo Valentin Subject: Re: [PATCH v1 07/10] thermal: tsens: Check if the IP is correctly enabled by firmware Date: Fri, 24 Aug 2018 16:30:41 -0700 Message-ID: <20180824233039.GF25163@localhost.localdomain> References: <985ed415774fdac9ac21afad4b4b74f30f6c5068.1533815718.git.amit.kucheria@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <985ed415774fdac9ac21afad4b4b74f30f6c5068.1533815718.git.amit.kucheria@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: Amit Kucheria Cc: linux-kernel@vger.kernel.org, rnayak@codeaurora.org, linux-arm-msm@vger.kernel.org, bjorn.andersson@linaro.org, smohanad@codeaurora.org, andy.gross@linaro.org, dianders@chromium.org, mka@chromium.org, Zhang Rui , linux-pm@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org 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 > --- > 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 > #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 >