[PATCH v7 05/28] media: ov5640: Add LINK_FREQ control

Sakari Ailus
2022-05-13T14:16:08Z

Add the V4L2_CID_LINK_FREQ control to the ov5640 driver.
Make the control read-only for the moment.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Hugues Fruchet <hugues.fruchet@foss.st.com>
Tested-by: Hugues Fruchet <hugues.fruchet@foss.st.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
drivers/media/i2c/ov5640.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 297ed135c4768..aa1d2e7fb8190 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -141,6 +141,24 @@ static const u32 ov5640_pixel_rates[] = {
[OV5640_PIXEL_RATE_48M] = 48000000,
};

+/*
+ * MIPI CSI-2 link frequencies.
+ *
+ * Derived from the above defined pixel rate for bpp = (8, 16, 24) and
+ * data_lanes = (1, 2)
+ *
+ * link_freq = (pixel_rate * bpp) / (2 * data_lanes)
+ */
+static const s64 ov5640_csi2_link_freqs[] = {
+ 992000000, 888000000, 768000000, 744000000, 672000000, 672000000,
+ 592000000, 592000000, 576000000, 576000000, 496000000, 496000000,
+ 384000000, 384000000, 384000000, 336000000, 296000000, 288000000,
+ 248000000, 192000000, 192000000, 192000000, 96000000,
+};
+
+/* Link freq for default mode: UYVY 16 bpp, 2 data lanes. */
+#define OV5640_DEFAULT_LINK_FREQ 13
+
enum ov5640_format_mux {
OV5640_FMT_MUX_YUV422 = 0,
OV5640_FMT_MUX_RGB,
@@ -258,6 +276,7 @@ struct ov5640_mode_info {
struct ov5640_ctrls {
struct v4l2_ctrl_handler handler;
struct v4l2_ctrl *pixel_rate;
+ struct v4l2_ctrl *link_freq;
struct {
struct v4l2_ctrl *auto_exp;
struct v4l2_ctrl *exposure;
@@ -2855,6 +2874,12 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
ov5640_pixel_rates[0], 1,
ov5640_pixel_rates[mode->pixel_rate]);

+ ctrls->link_freq = v4l2_ctrl_new_int_menu(hdl, ops,
+ V4L2_CID_LINK_FREQ,
+ ARRAY_SIZE(ov5640_csi2_link_freqs) - 1,
+ OV5640_DEFAULT_LINK_FREQ,
+ ov5640_csi2_link_freqs);
+
/* Auto/manual white balance */
ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_AUTO_WHITE_BALANCE,
@@ -2903,6 +2928,7 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
}

ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+ ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;

--
2.30.2