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V4L/DVB (7163): em28xx: makes audio settings more stable 

Improves audio configurations on em28xx:
        - mutes audio before changing amux;
        - adds a delay after setting audio src;
        - waits up to 50ms for ac97 busy.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab 2008-02-06 18:34:13 -03:00
parent 0df8130fe8
commit 00b8730f5d
2 changed files with 21 additions and 10 deletions
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22
drivers/media/video/em28xx/em28xx-core.c
View File

@ -255,21 +255,26 @@ static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
*/
static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 *val)
{
int ret;
int ret, i;
u8 addr = reg & 0x7f;
if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
return ret;
if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
return ret;
/* Wait up to 50 ms for AC97 command to complete */
for (i = 0; i < 10; i++) {
if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
return ret;
else if (((u8) ret) & 0x01) {
em28xx_warn ("AC97 command still being executed: not handled properly!\n");
if (!((u8) ret) & 0x01)
return 0;
msleep(5);
}
em28xx_warn ("AC97 command still being executed: not handled properly!\n");
return 0;
}
int em28xx_set_audio_source(struct em28xx *dev)
static int em28xx_set_audio_source(struct em28xx *dev)
{
static char *enable = "\x08\x08";
static char *disable = "\x08\x88";
@ -312,6 +317,7 @@ int em28xx_set_audio_source(struct em28xx *dev)
ret = em28xx_write_reg_bits(dev, AUDIOSRC_REG, input, 0xc0);
if (ret < 0)
return ret;
msleep(5);
/* Sets AC97 mixer registers
This is seems to be needed, even for non-ac97 configs
@ -334,9 +340,10 @@ int em28xx_audio_analog_set(struct em28xx *dev)
s[0] |= 0x1f - dev->volume;
s[1] |= 0x1f - dev->volume;
if (dev->mute)
/* Mute */
s[1] |= 0x80;
ret = em28xx_write_ac97(dev, MASTER_AC97, s);
if (ret < 0)
return ret;
@ -354,6 +361,11 @@ int em28xx_audio_analog_set(struct em28xx *dev)
/* Selects the proper audio input */
ret = em28xx_set_audio_source(dev);
/* Unmute device */
if (!dev->mute)
s[1] &= ~0x80;
ret = em28xx_write_ac97(dev, MASTER_AC97, s);
return ret;
}
EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);

3
drivers/media/video/em28xx/em28xx-video.c
View File

@ -189,7 +189,7 @@ static void video_mux(struct em28xx *dev, int index)
em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
}
em28xx_set_audio_source(dev);
em28xx_audio_analog_set(dev);
}
/* Usage lock check functions */
@ -837,7 +837,6 @@ static int em28xx_reg_len(int reg)
case AC97LSB_REG:
case HSCALELOW_REG:
case VSCALELOW_REG:
return 2;
default:
return 1;