[media] adv7842: adjust gain and offset for DVI-D signals

If the input signal is DVI-D and quantization range is RGB full range,
gain and offset must be adjusted to get the right range on the output.
Copied and adopted from adv7604.

Signed-off-by: Martin Bugge <marbugge@cisco.com>
Cc: Mats Randgaard <matrandg@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c
index 1effc21..f7a4d79 100644 (file)
--- a/drivers/media/i2c/adv7842.c
+++ b/drivers/media/i2c/adv7842.c
@@ -546,6 +546,14 @@ static void main_reset(struct v4l2_subdev *sd)
 
 /* ----------------------------------------------------------------------- */
 
+static inline bool is_analog_input(struct v4l2_subdev *sd)
+{
+       struct adv7842_state *state = to_state(sd);
+
+       return ((state->mode == ADV7842_MODE_RGB) ||
+               (state->mode == ADV7842_MODE_COMP));
+}
+
 static inline bool is_digital_input(struct v4l2_subdev *sd)
 {
        struct adv7842_state *state = to_state(sd);
@@ -1027,12 +1035,72 @@ static void configure_custom_video_timings(struct v4l2_subdev *sd,
        cp_write(sd, 0xac, (height & 0x0f) << 4);
 }
 
+static void adv7842_set_offset(struct v4l2_subdev *sd, bool auto_offset, u16 offset_a, u16 offset_b, u16 offset_c)
+{
+       struct adv7842_state *state = to_state(sd);
+       u8 offset_buf[4];
+
+       if (auto_offset) {
+               offset_a = 0x3ff;
+               offset_b = 0x3ff;
+               offset_c = 0x3ff;
+       }
+
+       v4l2_dbg(2, debug, sd, "%s: %s offset: a = 0x%x, b = 0x%x, c = 0x%x\n",
+                __func__, auto_offset ? "Auto" : "Manual",
+                offset_a, offset_b, offset_c);
+
+       offset_buf[0]= (cp_read(sd, 0x77) & 0xc0) | ((offset_a & 0x3f0) >> 4);
+       offset_buf[1] = ((offset_a & 0x00f) << 4) | ((offset_b & 0x3c0) >> 6);
+       offset_buf[2] = ((offset_b & 0x03f) << 2) | ((offset_c & 0x300) >> 8);
+       offset_buf[3] = offset_c & 0x0ff;
+
+       /* Registers must be written in this order with no i2c access in between */
+       if (adv_smbus_write_i2c_block_data(state->i2c_cp, 0x77, 4, offset_buf))
+               v4l2_err(sd, "%s: i2c error writing to CP reg 0x77, 0x78, 0x79, 0x7a\n", __func__);
+}
+
+static void adv7842_set_gain(struct v4l2_subdev *sd, bool auto_gain, u16 gain_a, u16 gain_b, u16 gain_c)
+{
+       struct adv7842_state *state = to_state(sd);
+       u8 gain_buf[4];
+       u8 gain_man = 1;
+       u8 agc_mode_man = 1;
+
+       if (auto_gain) {
+               gain_man = 0;
+               agc_mode_man = 0;
+               gain_a = 0x100;
+               gain_b = 0x100;
+               gain_c = 0x100;
+       }
+
+       v4l2_dbg(2, debug, sd, "%s: %s gain: a = 0x%x, b = 0x%x, c = 0x%x\n",
+                __func__, auto_gain ? "Auto" : "Manual",
+                gain_a, gain_b, gain_c);
+
+       gain_buf[0] = ((gain_man << 7) | (agc_mode_man << 6) | ((gain_a & 0x3f0) >> 4));
+       gain_buf[1] = (((gain_a & 0x00f) << 4) | ((gain_b & 0x3c0) >> 6));
+       gain_buf[2] = (((gain_b & 0x03f) << 2) | ((gain_c & 0x300) >> 8));
+       gain_buf[3] = ((gain_c & 0x0ff));
+
+       /* Registers must be written in this order with no i2c access in between */
+       if (adv_smbus_write_i2c_block_data(state->i2c_cp, 0x73, 4, gain_buf))
+               v4l2_err(sd, "%s: i2c error writing to CP reg 0x73, 0x74, 0x75, 0x76\n", __func__);
+}
+
 static void set_rgb_quantization_range(struct v4l2_subdev *sd)
 {
        struct adv7842_state *state = to_state(sd);
+       bool rgb_output = io_read(sd, 0x02) & 0x02;
+       bool hdmi_signal = hdmi_read(sd, 0x05) & 0x80;
+
+       v4l2_dbg(2, debug, sd, "%s: RGB quantization range: %d, RGB out: %d, HDMI: %d\n",
+                       __func__, state->rgb_quantization_range,
+                       rgb_output, hdmi_signal);
 
-       v4l2_dbg(2, debug, sd, "%s: rgb_quantization_range = %d\n",
-                      __func__, state->rgb_quantization_range);
+       adv7842_set_gain(sd, true, 0x0, 0x0, 0x0);
+       adv7842_set_offset(sd, true, 0x0, 0x0, 0x0);
 
        switch (state->rgb_quantization_range) {
        case V4L2_DV_RGB_RANGE_AUTO:
@@ -1050,7 +1118,7 @@ static void set_rgb_quantization_range(struct v4l2_subdev *sd)
                        break;
                }
 
-               if (hdmi_read(sd, 0x05) & 0x80) {
+               if (hdmi_signal) {
                        /* Receiving HDMI signal
                         * Set automode */
                        io_write_and_or(sd, 0x02, 0x0f, 0xf0);
@@ -1066,24 +1134,45 @@ static void set_rgb_quantization_range(struct v4l2_subdev *sd)
                } else {
                        /* RGB full range (0-255) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x10);
+
+                       if (is_digital_input(sd) && rgb_output) {
+                               adv7842_set_offset(sd, false, 0x40, 0x40, 0x40);
+                       } else {
+                               adv7842_set_gain(sd, false, 0xe0, 0xe0, 0xe0);
+                               adv7842_set_offset(sd, false, 0x70, 0x70, 0x70);
+                       }
                }
                break;
        case V4L2_DV_RGB_RANGE_LIMITED:
                if (state->mode == ADV7842_MODE_COMP) {
                        /* YCrCb limited range (16-235) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x20);
-               } else {
-                       /* RGB limited range (16-235) */
-                       io_write_and_or(sd, 0x02, 0x0f, 0x00);
+                       break;
                }
+
+               /* RGB limited range (16-235) */
+               io_write_and_or(sd, 0x02, 0x0f, 0x00);
+
                break;
        case V4L2_DV_RGB_RANGE_FULL:
                if (state->mode == ADV7842_MODE_COMP) {
                        /* YCrCb full range (0-255) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x60);
+                       break;
+               }
+
+               /* RGB full range (0-255) */
+               io_write_and_or(sd, 0x02, 0x0f, 0x10);
+
+               if (is_analog_input(sd) || hdmi_signal)
+                       break;
+
+               /* Adjust gain/offset for DVI-D signals only */
+               if (rgb_output) {
+                       adv7842_set_offset(sd, false, 0x40, 0x40, 0x40);
                } else {
-                       /* RGB full range (0-255) */
-                       io_write_and_or(sd, 0x02, 0x0f, 0x10);
+                       adv7842_set_gain(sd, false, 0xe0, 0xe0, 0xe0);
+                       adv7842_set_offset(sd, false, 0x70, 0x70, 0x70);
                }
                break;
        }
@@ -1717,8 +1806,8 @@ static void select_input(struct v4l2_subdev *sd,
                 * (rev. 2.5, June 2010)" p. 17. */
                afe_write(sd, 0x12, 0xfb); /* ADC noise shaping filter controls */
                afe_write(sd, 0x0c, 0x0d); /* CP core gain controls */
-               cp_write(sd, 0x3e, 0x80); /* CP core pre-gain control,
-                                            enable color control */
+               cp_write(sd, 0x3e, 0x00); /* CP core pre-gain control */
+
                /* CP coast control */
                cp_write(sd, 0xc3, 0x33); /* Component mode */