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X-CSE-ConnectionGUID: ZJbdv8v1TvKwMhoN5yVS8w== X-CSE-MsgGUID: GqSF6FPxQ2GbNT7w0+n+mw== X-IronPort-AV: E=McAfee;i="6700,10204,11445"; a="75693438" X-IronPort-AV: E=Sophos;i="6.15,317,1739865600"; d="scan'208";a="75693438" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 May 2025 23:36:51 -0700 X-CSE-ConnectionGUID: /PhxJ89BSNaYc6wNOcq0Vg== X-CSE-MsgGUID: xA3sQva5RqaRW2I2vgVTEQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,317,1739865600"; d="scan'208";a="146557371" Received: from fdefranc-mobl3.ger.corp.intel.com (HELO kekkonen.fi.intel.com) ([10.245.244.73]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 May 2025 23:36:47 -0700 Received: from kekkonen.localdomain (localhost [127.0.0.1]) by kekkonen.fi.intel.com (Postfix) with SMTP id ACC1511F738; Tue, 27 May 2025 09:36:42 +0300 (EEST) Date: Tue, 27 May 2025 06:36:42 +0000 Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo From: Sakari Ailus To: Mathis Foerst Cc: linux-kernel@vger.kernel.org, Laurent Pinchart , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Steve Longerbeam , Philipp Zabel , Greg Kroah-Hartman , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-staging@lists.linux.dev, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, manuel.traut@mt.com, mathis.foerst@zuehlke.com Subject: Re: [PATCH v6 7/7] media: mt9m114: Set pad-slew-rate Message-ID: References: <20250522143512.112043-1-mathis.foerst@mt.com> <20250522143512.112043-8-mathis.foerst@mt.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250522143512.112043-8-mathis.foerst@mt.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250526_233656_220221_2B886784 X-CRM114-Status: GOOD ( 23.09 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Mathis, On Thu, May 22, 2025 at 04:35:11PM +0200, Mathis Foerst wrote: > The MT9M114 supports the different slew rates (0 to 7) on the output pads. > At the moment, this is hardcoded to 7 (the fastest rate). > The user might want to change this values due to EMC requirements. > > Read the 'slew-rate' from the DT and configure the pad slew rates of > the output pads accordingly in mt9m114_initialize(). > Remove the hardcoded slew rate setting from the mt9m114_init table. > > Signed-off-by: Mathis Foerst > Reviewed-by: Laurent Pinchart > --- > drivers/media/i2c/mt9m114.c | 26 +++++++++++++++++++++++--- > 1 file changed, 23 insertions(+), 3 deletions(-) > > diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c > index 9ff46c72dbc1..f3f9ecc0866c 100644 > --- a/drivers/media/i2c/mt9m114.c > +++ b/drivers/media/i2c/mt9m114.c > @@ -18,6 +18,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -42,6 +43,9 @@ > #define MT9M114_RESET_AND_MISC_CONTROL CCI_REG16(0x001a) > #define MT9M114_RESET_SOC BIT(0) > #define MT9M114_PAD_SLEW CCI_REG16(0x001e) > +#define MT9M114_PAD_SLEW_MIN 0 > +#define MT9M114_PAD_SLEW_MAX 7 > +#define MT9M114_PAD_SLEW_DEFAULT 7 > #define MT9M114_PAD_CONTROL CCI_REG16(0x0032) > > /* XDMA registers */ > @@ -388,6 +392,7 @@ struct mt9m114 { > > unsigned int pixrate; > bool streaming; > + u32 pad_slew_rate; > > /* Pixel Array */ > struct { > @@ -650,9 +655,6 @@ static const struct cci_reg_sequence mt9m114_init[] = { > { MT9M114_CAM_SENSOR_CFG_FINE_INTEG_TIME_MAX, 1459 }, > { MT9M114_CAM_SENSOR_CFG_FINE_CORRECTION, 96 }, > { MT9M114_CAM_SENSOR_CFG_REG_0_DATA, 32 }, > - > - /* Miscellaneous settings */ > - { MT9M114_PAD_SLEW, 0x0777 }, > }; > > /* ----------------------------------------------------------------------------- > @@ -784,6 +786,13 @@ static int mt9m114_initialize(struct mt9m114 *sensor) > if (ret < 0) > return ret; > > + value = (sensor->pad_slew_rate) > + | (sensor->pad_slew_rate) << 4 > + | (sensor->pad_slew_rate) << 8; Please drop the redundant parentheses. > + cci_write(sensor->regmap, MT9M114_PAD_SLEW, value, &ret); > + if (ret < 0) > + return ret; > + > ret = mt9m114_set_state(sensor, MT9M114_SYS_STATE_ENTER_CONFIG_CHANGE); > if (ret < 0) > return ret; > @@ -2398,6 +2407,17 @@ static int mt9m114_parse_dt(struct mt9m114 *sensor) > goto error; > } > > + sensor->pad_slew_rate = MT9M114_PAD_SLEW_DEFAULT; > + device_property_read_u32(&sensor->client->dev, "slew-rate", > + &sensor->pad_slew_rate); > + > + if (sensor->pad_slew_rate < MT9M114_PAD_SLEW_MIN || > + sensor->pad_slew_rate > MT9M114_PAD_SLEW_MAX) { > + dev_err(&sensor->client->dev, "Invalid slew-rate %u\n", > + sensor->pad_slew_rate); > + return -EINVAL; > + } > + > return 0; > > error: -- Sakari Ailus