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[77.116.208.33]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5c0bb1e51c8sm2525549a12.34.2024.08.28.11.13.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Aug 2024 11:13:38 -0700 (PDT) From: Benjamin Bara X-Google-Original-From: Benjamin Bara Date: Wed, 28 Aug 2024 20:13:07 +0200 Subject: [PATCH v2 1/2] media: i2c: imx290: Check for availability in probe() Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240828-imx290-avail-v2-1-bd320ac8e8fa@skidata.com> References: <20240828-imx290-avail-v2-0-bd320ac8e8fa@skidata.com> In-Reply-To: <20240828-imx290-avail-v2-0-bd320ac8e8fa@skidata.com> To: Mauro Carvalho Chehab , Manivannan Sadhasivam , Sakari Ailus Cc: Hans de Goede , Laurent Pinchart , Alexander Stein , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Bara X-Mailer: b4 0.14.1 Currently, the V4L2 subdevice is also created when the device is not available/connected. In this case, dmesg shows the following: [ 10.419510] imx290 7-001a: Error writing reg 0x301c: -6 [ 10.428981] imx290 7-001a: Error writing reg 0x3020: -6 [ 10.442712] imx290 7-001a: Error writing reg 0x3018: -6 [ 10.454018] imx290 7-001a: Error writing reg 0x3020: -6 which seems to come from imx290_ctrl_update() after the subdev init is finished. However, as the errors are ignored, the subdev is initialized but simply does not work. From userspace perspective, there is no visible difference between a working and not-working subdevice (except when trying it out or watching for the error message). This commit adds a simple availability check before starting with the subdev initialization to error out instead. Signed-off-by: Benjamin Bara --- Changes since v1: - define operating/standby mode and use it - read out the standby mode during probe and ensure it is standby --- drivers/media/i2c/imx290.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c index 4150e6e4b9a6..2a869576600c 100644 --- a/drivers/media/i2c/imx290.c +++ b/drivers/media/i2c/imx290.c @@ -29,6 +29,8 @@ #include #define IMX290_STANDBY CCI_REG8(0x3000) +#define IMX290_STANDBY_OPERATING (0 << 0) +#define IMX290_STANDBY_STANDBY (1 << 0) #define IMX290_REGHOLD CCI_REG8(0x3001) #define IMX290_XMSTA CCI_REG8(0x3002) #define IMX290_ADBIT CCI_REG8(0x3005) @@ -1016,7 +1018,7 @@ static int imx290_start_streaming(struct imx290 *imx290, return ret; } - cci_write(imx290->regmap, IMX290_STANDBY, 0x00, &ret); + cci_write(imx290->regmap, IMX290_STANDBY, IMX290_STANDBY_OPERATING, &ret); msleep(30); @@ -1029,7 +1031,7 @@ static int imx290_stop_streaming(struct imx290 *imx290) { int ret = 0; - cci_write(imx290->regmap, IMX290_STANDBY, 0x01, &ret); + cci_write(imx290->regmap, IMX290_STANDBY, IMX290_STANDBY_STANDBY, &ret); msleep(30); @@ -1520,6 +1522,7 @@ static int imx290_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct imx290 *imx290; + u64 val; int ret; imx290 = devm_kzalloc(dev, sizeof(*imx290), GFP_KERNEL); @@ -1580,6 +1583,16 @@ static int imx290_probe(struct i2c_client *client) pm_runtime_set_autosuspend_delay(dev, 1000); pm_runtime_use_autosuspend(dev); + /* Make sure the sensor is available before V4L2 subdev init. */ + ret = cci_read(imx290->regmap, IMX290_STANDBY, &val, NULL); + if (ret) + goto err_pm; + if (val != IMX290_STANDBY_STANDBY) { + dev_err(dev, "Sensor is not in standby mode\n"); + ret = -ENODEV; + goto err_pm; + } + /* Initialize the V4L2 subdev. */ ret = imx290_subdev_init(imx290); if (ret)