diff options
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-core.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-core.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c index a88257a..3f86d36 100644 --- a/drivers/media/video/em28xx/em28xx-core.c +++ b/drivers/media/video/em28xx/em28xx-core.c @@ -50,7 +50,7 @@ MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]"); printk(KERN_INFO "%s %s :"fmt, \ dev->name, __func__ , ##arg); } while (0) -static int alt = EM28XX_PINOUT; +static int alt; module_param(alt, int, 0644); MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint"); @@ -533,8 +533,15 @@ int em28xx_audio_setup(struct em28xx *dev) vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1); if (vid1 < 0) { - /* Device likely doesn't support AC97 */ + /* + * Device likely doesn't support AC97 + * Note: (some) em2800 devices without eeprom reports 0x91 on + * CHIPCFG register, even not having an AC97 chip + */ em28xx_warn("AC97 chip type couldn't be determined\n"); + dev->audio_mode.ac97 = EM28XX_NO_AC97; + dev->has_alsa_audio = 0; + dev->audio_mode.has_audio = 0; goto init_audio; } @@ -778,6 +785,16 @@ int em28xx_set_alternate(struct em28xx *dev) int i; unsigned int min_pkt_size = dev->width * 2 + 4; + /* + * alt = 0 is used only for control messages, so, only values + * greater than 0 can be used for streaming. + */ + if (alt && alt < dev->num_alt) { + em28xx_coredbg("alternate forced to %d\n", dev->alt); + dev->alt = alt; + goto set_alt; + } + /* When image size is bigger than a certain value, the frame size should be increased, otherwise, only green screen will be received. @@ -798,6 +815,7 @@ int em28xx_set_alternate(struct em28xx *dev) dev->alt = i; } +set_alt: if (dev->alt != prev_alt) { em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n", min_pkt_size, dev->alt); |
