Commit 107d7b18 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[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: default avatarAntti Palosaari <crope@iki.fi>
Cc: Steven Toth <stoth@hauppauge.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent f3b1af19

drivers/media/dvb/frontends/cx24116.c

+14 −3
Original line number Diff line number Diff line
@@ -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);

drivers/media/dvb/frontends/cx24116.h

+3 −0
Original line number Diff line number Diff line
@@ -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) || \