diff options
| author | Antti Palosaari <crope@iki.fi> | 2011-04-27 21:03:07 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-05-20 09:30:00 -0300 |
| commit | 107d7b181ddeaeea92d1aa25f2e1e5a3acb7da40 (patch) | |
| tree | 1b18ffd6a3f729b5ea876ef9c0bfeefc6f3975d6 /drivers | |
| parent | f3b1af19647f375efb96cbd0589f9279caea7023 (diff) | |
| download | linux-rt-107d7b181ddeaeea92d1aa25f2e1e5a3acb7da40.tar.gz | |
[media] cx24116: add config option to split firmware download
It is very rare I2C adapter hardware which can provide 32kB I2C write
as one write. Add .i2c_wr_max option to set desired max packet size.
Split transaction to smaller pieces according to that option.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Cc: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/dvb/frontends/cx24116.c | 17 | ||||
| -rw-r--r-- | drivers/media/dvb/frontends/cx24116.h | 3 |
2 files changed, 17 insertions, 3 deletions
diff --git a/drivers/media/dvb/frontends/cx24116.c b/drivers/media/dvb/frontends/cx24116.c index cf1ec6c82042..26e65a66719a 100644 --- a/drivers/media/dvb/frontends/cx24116.c +++ b/drivers/media/dvb/frontends/cx24116.c @@ -566,7 +566,7 @@ static int cx24116_load_firmware(struct dvb_frontend *fe, { struct cx24116_state *state = fe->demodulator_priv; struct cx24116_cmd cmd; - int i, ret; + int i, ret, len, remaining; unsigned char vers[4]; dprintk("%s\n", __func__); @@ -603,8 +603,19 @@ static int cx24116_load_firmware(struct dvb_frontend *fe, cx24116_writereg(state, 0xF5, 0x00); cx24116_writereg(state, 0xF6, 0x00); - /* write the entire firmware as one transaction */ - cx24116_writeregN(state, 0xF7, fw->data, fw->size); + /* Split firmware to the max I2C write len and write. + * This overflows 16 bit intentionally in order to get max write + * len when i2c_wr_max is set to 0. */ + for (remaining = fw->size; remaining > 0; + remaining -= (u16) (state->config->i2c_wr_max - 1)) { + + len = remaining; + if (len > (u16) (state->config->i2c_wr_max - 1)) + len = (u16) (state->config->i2c_wr_max - 1); + + cx24116_writeregN(state, 0xF7, &fw->data[fw->size - remaining], + len); + } cx24116_writereg(state, 0xF4, 0x10); cx24116_writereg(state, 0xF0, 0x00); diff --git a/drivers/media/dvb/frontends/cx24116.h b/drivers/media/dvb/frontends/cx24116.h index b1b76b47a14c..7d90ab949c03 100644 --- a/drivers/media/dvb/frontends/cx24116.h +++ b/drivers/media/dvb/frontends/cx24116.h @@ -35,6 +35,9 @@ struct cx24116_config { /* Need to set MPEG parameters */ u8 mpg_clk_pos_pol:0x02; + + /* max bytes I2C provider can write at once */ + u16 i2c_wr_max; }; #if defined(CONFIG_DVB_CX24116) || \ |