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[2/3] media: i2c: imx219: make HBLANK r/w to allow longer exposures

Message ID 20241029-imx219_fixes-v1-2-b45dc3658b4e@ideasonboard.com (mailing list archive)
State New
Headers show
Series media: i2c: imx219: Fixes for blanking and pixel rate | expand

Commit Message

Jai Luthra Oct. 29, 2024, 8:57 a.m. UTC 
From: Dave Stevenson <dave.stevenson@raspberrypi.com>

The HBLANK control was read-only, and always configured such
that the sensor HTS register was 3448. This limited the maximum
exposure time that could be achieved to around 1.26 secs.

Make HBLANK read/write so that the line time can be extended,
and thereby allow longer exposures (and slower frame rates).
Retain the overall HTS setting when changing modes rather than
resetting it to a default.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
---
 drivers/media/i2c/imx219.c | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index f98aad74fe584a18e2fe7126f92bf294762a54e3..de9230d4ad81f085640be254db9391ae7ad20773 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -76,8 +76,10 @@ 
 
 #define IMX219_VBLANK_MIN		32
 
-/* HBLANK control - read only */
-#define IMX219_PPL_DEFAULT		3448
+/* HBLANK control range */
+#define IMX219_PPL_MIN			3448
+#define IMX219_PPL_MAX			0x7ff0
+#define IMX219_REG_HTS			CCI_REG16(0x0162)
 
 #define IMX219_REG_LINE_LENGTH_A	CCI_REG16(0x0162)
 #define IMX219_REG_X_ADD_STA_A		CCI_REG16(0x0164)
@@ -422,6 +424,10 @@  static int imx219_set_ctrl(struct v4l2_ctrl *ctrl)
 		cci_write(imx219->regmap, IMX219_REG_VTS,
 			  format->height + ctrl->val, &ret);
 		break;
+	case V4L2_CID_HBLANK:
+		cci_write(imx219->regmap, IMX219_REG_HTS,
+			  format->width + ctrl->val, &ret);
+		break;
 	case V4L2_CID_TEST_PATTERN_RED:
 		cci_write(imx219->regmap, IMX219_REG_TESTP_RED,
 			  ctrl->val, &ret);
@@ -496,12 +502,11 @@  static int imx219_init_controls(struct imx219 *imx219)
 					   V4L2_CID_VBLANK, IMX219_VBLANK_MIN,
 					   IMX219_VTS_MAX - mode->height, 1,
 					   mode->vts_def - mode->height);
-	hblank = IMX219_PPL_DEFAULT - mode->width;
+	hblank = IMX219_PPL_MIN - mode->width;
 	imx219->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
-					   V4L2_CID_HBLANK, hblank, hblank,
+					   V4L2_CID_HBLANK, hblank,
+					   IMX219_PPL_MIN - mode->width,
 					   1, hblank);
-	if (imx219->hblank)
-		imx219->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 	exposure_max = mode->vts_def - 4;
 	exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
 		exposure_max : IMX219_EXPOSURE_DEFAULT;
@@ -842,6 +847,7 @@  static int imx219_set_pad_format(struct v4l2_subdev *sd,
 	crop->top = (IMX219_NATIVE_HEIGHT - crop->height) / 2;
 
 	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+		u32 prev_hts = format->width + imx219->hblank->val;
 		int exposure_max;
 		int exposure_def;
 		int hblank;
@@ -861,13 +867,18 @@  static int imx219_set_pad_format(struct v4l2_subdev *sd,
 					 exposure_max, imx219->exposure->step,
 					 exposure_def);
 		/*
-		 * Currently PPL is fixed to IMX219_PPL_DEFAULT, so hblank
-		 * depends on mode->width only, and is not changeble in any
-		 * way other than changing the mode.
+		 * Retain PPL setting from previous mode so that the
+		 * line time does not change on a mode change.
+		 * Limits have to be recomputed as the controls define
+		 * the blanking only, so PPL values need to have the
+		 * mode width subtracted.
 		 */
-		hblank = IMX219_PPL_DEFAULT - mode->width;
-		__v4l2_ctrl_modify_range(imx219->hblank, hblank, hblank, 1,
-					 hblank);
+		hblank = prev_hts - mode->width;
+		__v4l2_ctrl_modify_range(imx219->hblank,
+					 IMX219_PPL_MIN - mode->width,
+					 IMX219_PPL_MAX - mode->width,
+					 1, IMX219_PPL_MIN - mode->width);
+		__v4l2_ctrl_s_ctrl(imx219->hblank, hblank);
 	}
 
 	return 0;