From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.kapsi.fi ([217.30.184.167]:43252 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751565AbcF2Xj7 (ORCPT ); Wed, 29 Jun 2016 19:39:59 -0400 From: Antti Palosaari To: linux-media@vger.kernel.org Cc: Antti Palosaari Subject: [PATCH 3/5] m88ds3103: improve ts clock setting Date: Thu, 30 Jun 2016 02:39:46 +0300 Message-Id: <1467243588-26204-3-git-send-email-crope@iki.fi> In-Reply-To: <1467243588-26204-1-git-send-email-crope@iki.fi> References: <1467243588-26204-1-git-send-email-crope@iki.fi> Sender: linux-media-owner@vger.kernel.org List-ID: Simplify TS clock divider calculation and programming slightly. Signed-off-by: Antti Palosaari --- drivers/media/dvb-frontends/m88ds3103.c | 39 ++++++++++++++------------------- 1 file changed, 16 insertions(+), 23 deletions(-) diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index 6f03ca8..fae9251 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -306,7 +306,7 @@ static int m88ds3103_set_frontend(struct dvb_frontend *fe) const struct m88ds3103_reg_val *init; u8 u8tmp, u8tmp1 = 0, u8tmp2 = 0; /* silence compiler warning */ u8 buf[3]; - u16 u16tmp, divide_ratio = 0; + u16 u16tmp; u32 tuner_frequency, target_mclk; s32 s32tmp; @@ -522,37 +522,25 @@ static int m88ds3103_set_frontend(struct dvb_frontend *fe) ret = m88ds3103_update_bits(dev, 0x29, 0x20, u8tmp1); if (ret) goto err; - u8tmp1 = 0; - u8tmp2 = 0; + u16tmp = 0; + u8tmp1 = 0x3f; + u8tmp2 = 0x3f; break; default: - if (dev->cfg->ts_clk) { - divide_ratio = DIV_ROUND_UP(target_mclk, dev->cfg->ts_clk); - u8tmp1 = divide_ratio / 2; - u8tmp2 = DIV_ROUND_UP(divide_ratio, 2); - } + u16tmp = DIV_ROUND_UP(target_mclk, dev->cfg->ts_clk); + u8tmp1 = u16tmp / 2 - 1; + u8tmp2 = DIV_ROUND_UP(u16tmp, 2) - 1; } - dev_dbg(&client->dev, - "target_mclk=%d ts_clk=%d divide_ratio=%d\n", - target_mclk, dev->cfg->ts_clk, divide_ratio); + dev_dbg(&client->dev, "target_mclk=%d ts_clk=%d ts_clk_divide_ratio=%u\n", + target_mclk, dev->cfg->ts_clk, u16tmp); - u8tmp1--; - u8tmp2--; /* u8tmp1[5:2] => fe[3:0], u8tmp1[1:0] => ea[7:6] */ - u8tmp1 &= 0x3f; /* u8tmp2[5:0] => ea[5:0] */ - u8tmp2 &= 0x3f; - - ret = regmap_bulk_read(dev->regmap, 0xfe, &u8tmp, 1); - if (ret) - goto err; - - u8tmp = ((u8tmp & 0xf0) << 0) | u8tmp1 >> 2; - ret = regmap_write(dev->regmap, 0xfe, u8tmp); + u8tmp = (u8tmp1 >> 2) & 0x0f; + ret = regmap_update_bits(dev->regmap, 0xfe, 0x0f, u8tmp); if (ret) goto err; - u8tmp = ((u8tmp1 & 0x03) << 6) | u8tmp2 >> 0; ret = regmap_write(dev->regmap, 0xea, u8tmp); if (ret) @@ -1444,6 +1432,11 @@ static int m88ds3103_probe(struct i2c_client *client, goto err_kfree; } + if (!pdata->ts_clk) { + ret = -EINVAL; + goto err_kfree; + } + /* 0x29 register is defined differently for m88rs6000. */ /* set internal tuner address to 0x21 */ if (dev->chip_id == M88RS6000_CHIP_ID) -- http://palosaari.fi/