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| author | Mats Randgaard <matrandg@cisco.com> | 2013-12-05 12:08:45 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-01-07 06:34:52 -0200 |
| commit | 5b64b205392fcf3bbbc0cedddeb0aa33cd769801 (patch) | |
| tree | 6222878f9cf8d52be0a6e5254c329e9281c130a2 | |
| parent | 7de6fab1fdc81381834db690ec0511ec87acc4d3 (diff) | |
| download | blackbird-obmc-linux-5b64b205392fcf3bbbc0cedddeb0aa33cd769801.tar.gz blackbird-obmc-linux-5b64b205392fcf3bbbc0cedddeb0aa33cd769801.zip | |
[media] adv7842: mute audio before switching inputs to avoid noise/pops
Signed-off-by: Mats Randgaard <matrandg@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
| -rw-r--r-- | drivers/media/i2c/adv7842.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c index a26c70ca581c..bbd80acbabfe 100644 --- a/drivers/media/i2c/adv7842.c +++ b/drivers/media/i2c/adv7842.c @@ -20,10 +20,13 @@ /* * References (c = chapter, p = page): - * REF_01 - Analog devices, ADV7842, Register Settings Recommendations, - * Revision 2.5, June 2010 + * REF_01 - Analog devices, ADV7842, + * Register Settings Recommendations, Rev. 1.9, April 2011 * REF_02 - Analog devices, Software User Guide, UG-206, * ADV7842 I2C Register Maps, Rev. 0, November 2010 + * REF_03 - Analog devices, Hardware User Guide, UG-214, + * ADV7842 Fast Switching 2:1 HDMI 1.4 Receiver with 3D-Comb + * Decoder and Digitizer , Rev. 0, January 2011 */ @@ -491,6 +494,11 @@ static inline int hdmi_write(struct v4l2_subdev *sd, u8 reg, u8 val) return adv_smbus_write_byte_data(state->i2c_hdmi, reg, val); } +static inline int hdmi_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val) +{ + return hdmi_write(sd, reg, (hdmi_read(sd, reg) & mask) | val); +} + static inline int cp_read(struct v4l2_subdev *sd, u8 reg) { struct adv7842_state *state = to_state(sd); @@ -1459,14 +1467,12 @@ static void enable_input(struct v4l2_subdev *sd) case ADV7842_MODE_SDP: case ADV7842_MODE_COMP: case ADV7842_MODE_RGB: - /* enable */ io_write(sd, 0x15, 0xb0); /* Disable Tristate of Pins (no audio) */ break; case ADV7842_MODE_HDMI: - /* enable */ - hdmi_write(sd, 0x1a, 0x0a); /* Unmute audio */ hdmi_write(sd, 0x01, 0x00); /* Enable HDMI clock terminators */ io_write(sd, 0x15, 0xa0); /* Disable Tristate of Pins */ + hdmi_write_and_or(sd, 0x1a, 0xef, 0x00); /* Unmute audio */ break; default: v4l2_dbg(2, debug, sd, "%s: Unknown mode %d\n", @@ -1477,9 +1483,9 @@ static void enable_input(struct v4l2_subdev *sd) static void disable_input(struct v4l2_subdev *sd) { - /* disable */ + hdmi_write_and_or(sd, 0x1a, 0xef, 0x10); /* Mute audio [REF_01, c. 2.2.2] */ + msleep(16); /* 512 samples with >= 32 kHz sample rate [REF_03, c. 8.29] */ io_write(sd, 0x15, 0xbe); /* Tristate all outputs from video core */ - hdmi_write(sd, 0x1a, 0x1a); /* Mute audio */ hdmi_write(sd, 0x01, 0x78); /* Disable HDMI clock terminators */ } @@ -2432,6 +2438,9 @@ static int adv7842_core_init(struct v4l2_subdev *sd) pdata->replicate_av_codes << 1 | pdata->invert_cbcr << 0); + /* HDMI audio */ + hdmi_write_and_or(sd, 0x1a, 0xf1, 0x08); /* Wait 1 s before unmute */ + /* Drive strength */ io_write_and_or(sd, 0x14, 0xc0, pdata->drive_strength.data<<4 | pdata->drive_strength.clock<<2 | |
