[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>
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@ -566,7 +566,7 @@ static int cx24116_load_firmware(struct dvb_frontend *fe,
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{
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struct cx24116_state *state = fe->demodulator_priv;
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struct cx24116_cmd cmd;
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int i, ret;
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int i, ret, len, remaining;
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unsigned char vers[4];
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dprintk("%s\n", __func__);
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@ -603,8 +603,19 @@ static int cx24116_load_firmware(struct dvb_frontend *fe,
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cx24116_writereg(state, 0xF5, 0x00);
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cx24116_writereg(state, 0xF6, 0x00);
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/* write the entire firmware as one transaction */
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cx24116_writeregN(state, 0xF7, fw->data, fw->size);
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/* Split firmware to the max I2C write len and write.
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* This overflows 16 bit intentionally in order to get max write
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* len when i2c_wr_max is set to 0. */
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for (remaining = fw->size; remaining > 0;
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remaining -= (u16) (state->config->i2c_wr_max - 1)) {
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len = remaining;
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if (len > (u16) (state->config->i2c_wr_max - 1))
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len = (u16) (state->config->i2c_wr_max - 1);
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cx24116_writeregN(state, 0xF7, &fw->data[fw->size - remaining],
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len);
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}
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cx24116_writereg(state, 0xF4, 0x10);
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cx24116_writereg(state, 0xF0, 0x00);
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@ -35,6 +35,9 @@ struct cx24116_config {
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/* Need to set MPEG parameters */
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u8 mpg_clk_pos_pol:0x02;
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/* max bytes I2C provider can write at once */
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u16 i2c_wr_max;
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};
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#if defined(CONFIG_DVB_CX24116) || \
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