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Commit 3bf5e552 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] af9033: implement i/o optimized reg table writer 



Use register address auto increment to reduce I/O when large
register / values tables are written.

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 0c13c54d

drivers/media/dvb-frontends/af9033.c

+37 −10
Original line number Diff line number Diff line
@@ -156,6 +156,37 @@ static int af9033_rd_reg_mask(struct af9033_state *state, u32 reg, u8 *val, 
	return 0;

}



/* write reg val table using reg addr auto increment */

static int af9033_wr_reg_val_tab(struct af9033_state *state,

		const struct reg_val *tab, int tab_len)

{

	int ret, i, j;

	u8 buf[tab_len];



	dev_dbg(&state->i2c->dev, "%s: tab_len=%d\n", __func__, tab_len);



	for (i = 0, j = 0; i < tab_len; i++) {

		buf[j] = tab[i].val;



		if (i == tab_len - 1 || tab[i].reg != tab[i + 1].reg - 1) {

			ret = af9033_wr_regs(state, tab[i].reg - j, buf, j + 1);

			if (ret < 0)

				goto err;



			j = 0;

		} else {

			j++;

		}

	}



	return 0;



err:

	dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);



	return ret;

}



static u32 af9033_div(struct af9033_state *state, u32 a, u32 b, u32 x)

{

	u32 r = 0, c = 0, i;
@@ -306,11 +337,9 @@ static int af9033_init(struct dvb_frontend *fe) 
		break;

	}



	for (i = 0; i < len; i++) {

		ret = af9033_wr_reg(state, init[i].reg, init[i].val);

	ret = af9033_wr_reg_val_tab(state, init, len);

	if (ret < 0)

		goto err;

	}



	/* load tuner specific settings */

	dev_dbg(&state->i2c->dev, "%s: load tuner specific settings\n",
@@ -371,11 +400,9 @@ static int af9033_init(struct dvb_frontend *fe) 
		goto err;

	}



	for (i = 0; i < len; i++) {

		ret = af9033_wr_reg(state, init[i].reg, init[i].val);

	ret = af9033_wr_reg_val_tab(state, init, len);

	if (ret < 0)

		goto err;

	}



	if (state->cfg.ts_mode == AF9033_TS_MODE_SERIAL) {

		ret = af9033_wr_reg_mask(state, 0x00d91c, 0x01, 0x01);