diff options
Diffstat (limited to 'drivers/media/i2c')
| -rw-r--r-- | drivers/media/i2c/adv7842.c | 49 |
1 files changed, 41 insertions, 8 deletions
diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c index eab9a1b8b54b..ae7252c1cd0c 100644 --- a/drivers/media/i2c/adv7842.c +++ b/drivers/media/i2c/adv7842.c @@ -85,6 +85,7 @@ struct adv7842_state { bool is_cea_format; struct workqueue_struct *work_queues; struct delayed_work delayed_work_enable_hotplug; + bool restart_stdi_once; bool hdmi_port_a; /* i2c clients */ @@ -1345,6 +1346,7 @@ static int adv7842_query_dv_timings(struct v4l2_subdev *sd, /* read STDI */ if (read_stdi(sd, &stdi)) { + state->restart_stdi_once = true; v4l2_dbg(1, debug, sd, "%s: no valid signal\n", __func__); return -ENOLINK; } @@ -1355,6 +1357,7 @@ static int adv7842_query_dv_timings(struct v4l2_subdev *sd, uint32_t freq; timings->type = V4L2_DV_BT_656_1120; + bt->width = (hdmi_read(sd, 0x07) & 0x0f) * 256 + hdmi_read(sd, 0x08); bt->height = (hdmi_read(sd, 0x09) & 0x0f) * 256 + hdmi_read(sd, 0x0a); freq = (hdmi_read(sd, 0x06) * 1000000) + @@ -1391,21 +1394,50 @@ static int adv7842_query_dv_timings(struct v4l2_subdev *sd, } adv7842_fill_optional_dv_timings_fields(sd, timings); } else { - /* Interlaced? */ - if (stdi.interlaced) { - v4l2_dbg(1, debug, sd, "%s: interlaced video not supported\n", __func__); - return -ERANGE; - } - + /* find format + * Since LCVS values are inaccurate [REF_03, p. 339-340], + * stdi2dv_timings() is called with lcvs +-1 if the first attempt fails. + */ + if (!stdi2dv_timings(sd, &stdi, timings)) + goto found; + stdi.lcvs += 1; + v4l2_dbg(1, debug, sd, "%s: lcvs + 1 = %d\n", __func__, stdi.lcvs); + if (!stdi2dv_timings(sd, &stdi, timings)) + goto found; + stdi.lcvs -= 2; + v4l2_dbg(1, debug, sd, "%s: lcvs - 1 = %d\n", __func__, stdi.lcvs); if (stdi2dv_timings(sd, &stdi, timings)) { + /* + * The STDI block may measure wrong values, especially + * for lcvs and lcf. If the driver can not find any + * valid timing, the STDI block is restarted to measure + * the video timings again. The function will return an + * error, but the restart of STDI will generate a new + * STDI interrupt and the format detection process will + * restart. + */ + if (state->restart_stdi_once) { + v4l2_dbg(1, debug, sd, "%s: restart STDI\n", __func__); + /* TODO restart STDI for Sync Channel 2 */ + /* enter one-shot mode */ + cp_write_and_or(sd, 0x86, 0xf9, 0x00); + /* trigger STDI restart */ + cp_write_and_or(sd, 0x86, 0xf9, 0x04); + /* reset to continuous mode */ + cp_write_and_or(sd, 0x86, 0xf9, 0x02); + state->restart_stdi_once = false; + return -ENOLINK; + } v4l2_dbg(1, debug, sd, "%s: format not supported\n", __func__); return -ERANGE; } + state->restart_stdi_once = true; } +found: if (debug > 1) - v4l2_print_dv_timings(sd->name, "adv7842_query_dv_timings: ", - timings, true); + v4l2_print_dv_timings(sd->name, "adv7842_query_dv_timings:", + timings, true); return 0; } @@ -2804,6 +2836,7 @@ static int adv7842_probe(struct i2c_client *client, state->mode = pdata->mode; state->hdmi_port_a = pdata->input == ADV7842_SELECT_HDMI_PORT_A; + state->restart_stdi_once = true; /* i2c access to adv7842? */ rev = adv_smbus_read_byte_data_check(client, 0xea, false) << 8 | |