media: i2c: imx290: Limit analogue gain according to module

Commit ec75fd9 upstream.

The imx327 only supports up to 29.4dB of analogue gain, vs
the imx290 going up to 30dB. Both are in 0.3dB steps.

As we now have model specific config, fix this mismatch,
and delete the comment referencing it.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Author: 6by9

drivers/media/i2c/imx290.c

@@ -178,6 +178,7 @@ struct imx290_model_info {
 	enum imx290_colour_variant colour_variant;
 	const struct cci_reg_sequence *init_regs;
 	size_t init_regs_num;
+	unsigned int max_analog_gain;
 	const char *name;
 };
 
@@ -878,14 +879,10 @@ static int imx290_ctrl_init(struct imx290 *imx290)
 	 * up to 72.0dB (240) add further digital gain. Limit the range to
 	 * analog gain only, support for digital gain can be added separately
 	 * if needed.
-	 *
-	 * The IMX327 and IMX462 are largely compatible with the IMX290, but
-	 * have an analog gain range of 0.0dB to 29.4dB and 42dB of digital
-	 * gain. When support for those sensors gets added to the driver, the
-	 * gain control should be adjusted accordingly.
 	 */
 	v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
-			  V4L2_CID_ANALOGUE_GAIN, 0, 100, 1, 0);
+			  V4L2_CID_ANALOGUE_GAIN, 0,
+			  imx290->model->max_analog_gain, 1, 0);
 
 	/*
 	 * Correct range will be determined through imx290_ctrl_update setting
@@ -1440,18 +1437,21 @@ static const struct imx290_model_info imx290_models[] = {
 		.colour_variant = IMX290_VARIANT_COLOUR,
 		.init_regs = imx290_global_init_settings_290,
 		.init_regs_num = ARRAY_SIZE(imx290_global_init_settings_290),
+		.max_analog_gain = 100,
 		.name = "imx290",
 	},
 	[IMX290_MODEL_IMX290LLR] = {
 		.colour_variant = IMX290_VARIANT_MONO,
 		.init_regs = imx290_global_init_settings_290,
 		.init_regs_num = ARRAY_SIZE(imx290_global_init_settings_290),
+		.max_analog_gain = 100,
 		.name = "imx290",
 	},
 	[IMX290_MODEL_IMX327LQR] = {
 		.colour_variant = IMX290_VARIANT_COLOUR,
 		.init_regs = imx290_global_init_settings_327,
 		.init_regs_num = ARRAY_SIZE(imx290_global_init_settings_327),
+		.max_analog_gain = 98,
 		.name = "imx327",
 	},
 };