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[media] cx24116: add config option to split firmware download

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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>
This commit is contained in:
Antti Palosaari 2011-04-27 21:03:07 -03:00 committed by Mauro Carvalho Chehab
parent f3b1af1964
commit 107d7b181d
2 changed files with 17 additions and 3 deletions
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17
drivers/media/dvb/frontends/cx24116.c
View File

@ -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);

3
drivers/media/dvb/frontends/cx24116.h
View File

@ -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) || \