diff options
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-core.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-core.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c index 7375353..b7a2fed 100644 --- a/drivers/media/video/em28xx/em28xx-core.c +++ b/drivers/media/video/em28xx/em28xx-core.c @@ -1012,6 +1012,41 @@ int em28xx_init_isoc(struct em28xx *dev, int max_packets, } EXPORT_SYMBOL_GPL(em28xx_init_isoc); +/* Determine the packet size for the DVB stream for the given device + (underlying value programmed into the eeprom) */ +int em28xx_isoc_dvb_max_packetsize(struct em28xx *dev) +{ + unsigned int chip_cfg2; + unsigned int packet_size = 564; + + if (dev->chip_id == CHIP_ID_EM2874) { + /* FIXME - for now assume 564 like it was before, but the + em2874 code should be added to return the proper value... */ + packet_size = 564; + } else { + /* TS max packet size stored in bits 1-0 of R01 */ + chip_cfg2 = em28xx_read_reg(dev, EM28XX_R01_CHIPCFG2); + switch (chip_cfg2 & EM28XX_CHIPCFG2_TS_PACKETSIZE_MASK) { + case EM28XX_CHIPCFG2_TS_PACKETSIZE_188: + packet_size = 188; + break; + case EM28XX_CHIPCFG2_TS_PACKETSIZE_376: + packet_size = 376; + break; + case EM28XX_CHIPCFG2_TS_PACKETSIZE_564: + packet_size = 564; + break; + case EM28XX_CHIPCFG2_TS_PACKETSIZE_752: + packet_size = 752; + break; + } + } + + em28xx_coredbg("dvb max packet size=%d\n", packet_size); + return packet_size; +} +EXPORT_SYMBOL_GPL(em28xx_isoc_dvb_max_packetsize); + /* * em28xx_wake_i2c() * configure i2c attached devices |
