linux-kernel - [alsa-devel][PATCH] ASoC: wm8960: Move register initialisation to I2C driver probe()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <1417078388-1289-1-git-send-email-b50113@freescale.com>
Date:	Thu, 27 Nov 2014 16:53:08 +0800
From:	Zidan Wang <b50113@...escale.com>
To:	<broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <perex@...ex.cz>, <tiwai@...e.de>,
	<lars@...afoo.de>, <ckeepax@...nsource.wolfsonmicro.com>,
	<Li.Xiubo@...escale.com>, <patches@...nsource.wolfsonmicro.com>,
	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
	Zidan Wang <b50113@...escale.com>
Subject: [alsa-devel][PATCH] ASoC: wm8960: Move register initialisation to I2C driver probe()

We must ensure that the clocking configuration is valid as rapidly as possible.
And do software reset before the others registers updates, or the registers
will be reset to the default state.

Signed-off-by: Zidan Wang <b50113@...escale.com>
---
 sound/soc/codecs/wm8960.c | 41 ++++++++++++++++++++---------------------
 1 file changed, 20 insertions(+), 21 deletions(-)

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index bc8793cd..031a1ae 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -128,7 +128,7 @@ struct wm8960_priv {
 	struct wm8960_data pdata;
 };
 
-#define wm8960_reset(c)	snd_soc_write(c, WM8960_RESET, 0)
+#define wm8960_reset(c)	regmap_write(c, WM8960_RESET, 0)
 
 /* enumerated controls */
 static const char *wm8960_polarity[] = {"No Inversion", "Left Inverted",
@@ -947,31 +947,12 @@ static int wm8960_probe(struct snd_soc_codec *codec)
 {
 	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
 	struct wm8960_data *pdata = &wm8960->pdata;
-	int ret;
 
 	if (pdata->capless)
 		wm8960->set_bias_level = wm8960_set_bias_level_capless;
 	else
 		wm8960->set_bias_level = wm8960_set_bias_level_out3;
 
-	ret = wm8960_reset(codec);
-	if (ret < 0) {
-		dev_err(codec->dev, "Failed to issue reset\n");
-		return ret;
-	}
-
-	/* Latch the update bits */
-	snd_soc_update_bits(codec, WM8960_LINVOL, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_RINVOL, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_LADC, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_RADC, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_LDAC, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_RDAC, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_LOUT1, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_ROUT1, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_LOUT2, 0x100, 0x100);
-	snd_soc_update_bits(codec, WM8960_ROUT2, 0x100, 0x100);
-
 	snd_soc_add_codec_controls(codec, wm8960_snd_controls,
 				     ARRAY_SIZE(wm8960_snd_controls));
 	wm8960_add_widgets(codec);
@@ -1030,7 +1011,13 @@ static int wm8960_i2c_probe(struct i2c_client *i2c,
 	else if (i2c->dev.of_node)
 		wm8960_set_pdata_from_of(i2c, &wm8960->pdata);
 
-	if (pdata && pdata->shared_lrclk) {
+	ret = wm8960_reset(wm8960->regmap);
+	if (ret != 0) {
+		dev_err(&i2c->dev, "Failed to issue reset\n");
+		return ret;
+	}
+
+	if (wm8960->pdata.shared_lrclk) {
 		ret = regmap_update_bits(wm8960->regmap, WM8960_ADDCTL2,
 					 0x4, 0x4);
 		if (ret != 0) {
@@ -1040,6 +1027,18 @@ static int wm8960_i2c_probe(struct i2c_client *i2c,
 		}
 	}
 
+	/* Latch the update bits */
+	regmap_update_bits(wm8960->regmap, WM8960_LINVOL, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_RINVOL, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_LADC, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_RADC, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_LDAC, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_RDAC, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_LOUT1, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_ROUT1, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_LOUT2, 0x100, 0x100);
+	regmap_update_bits(wm8960->regmap, WM8960_ROUT2, 0x100, 0x100);
+
 	i2c_set_clientdata(i2c, wm8960);
 
 	ret = snd_soc_register_codec(&i2c->dev,
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/