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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 22 Jul 2014 11:42:06 +0100
From:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:	perex@...ex.cz, tiwai@...e.de, lgirdwood@...il.com,
	broonie@...nel.org
Cc:	alsa-devel@...a-project.org, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] ASoC: arizona: Disable AIF TX/RX before configuring it

Changes to the AIF configuration registers only take
effect when the AIF is disabled. If the configuration
is being changed from the previous setup, temporarily
disable the AIF.

Signed-off-by: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
---
 sound/soc/codecs/arizona.c |   87 +++++++++++++++++++++++++++++++++++---------
 1 files changed, 69 insertions(+), 18 deletions(-)

diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index fb30c82..bd41ee4 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -1234,6 +1234,27 @@ static int arizona_hw_params_rate(struct snd_pcm_substream *substream,
 	return 0;
 }
 
+static bool arizona_aif_cfg_changed(struct snd_soc_codec *codec,
+				    int base, int bclk, int lrclk, int frame)
+{
+	int val;
+
+	val = snd_soc_read(codec, base + ARIZONA_AIF_BCLK_CTRL);
+	if (bclk != (val & ARIZONA_AIF1_BCLK_FREQ_MASK))
+		return true;
+
+	val = snd_soc_read(codec, base + ARIZONA_AIF_TX_BCLK_RATE);
+	if (lrclk != (val & ARIZONA_AIF1TX_BCPF_MASK))
+		return true;
+
+	val = snd_soc_read(codec, base + ARIZONA_AIF_FRAME_CTRL_1);
+	if (frame != (val & (ARIZONA_AIF1TX_WL_MASK |
+			     ARIZONA_AIF1TX_SLOT_LEN_MASK)))
+		return true;
+
+	return false;
+}
+
 static int arizona_hw_params(struct snd_pcm_substream *substream,
 			     struct snd_pcm_hw_params *params,
 			     struct snd_soc_dai *dai)
@@ -1249,6 +1270,8 @@ static int arizona_hw_params(struct snd_pcm_substream *substream,
 	int tdm_width = arizona->tdm_width[dai->id - 1];
 	int tdm_slots = arizona->tdm_slots[dai->id - 1];
 	int bclk, lrclk, wl, frame, bclk_target;
+	bool reconfig;
+	unsigned int aif_tx_state, aif_rx_state;
 
 	if (params_rate(params) % 8000)
 		rates = &arizona_44k1_bclk_rates[0];
@@ -1299,28 +1322,56 @@ static int arizona_hw_params(struct snd_pcm_substream *substream,
 	wl = snd_pcm_format_width(params_format(params));
 	frame = wl << ARIZONA_AIF1TX_WL_SHIFT | wl;
 
+	reconfig = arizona_aif_cfg_changed(codec, base, bclk, lrclk, frame);
+
+	if (reconfig) {
+		/* Save AIF TX/RX state */
+		aif_tx_state = snd_soc_read(codec,
+					    base + ARIZONA_AIF_TX_ENABLES);
+		aif_rx_state = snd_soc_read(codec,
+					    base + ARIZONA_AIF_RX_ENABLES);
+		/* Disable AIF TX/RX before reconfiguring it */
+		regmap_update_bits_async(arizona->regmap,
+				    base + ARIZONA_AIF_TX_ENABLES, 0xff, 0x0);
+		regmap_update_bits(arizona->regmap,
+				    base + ARIZONA_AIF_RX_ENABLES, 0xff, 0x0);
+	}
+
 	ret = arizona_hw_params_rate(substream, params, dai);
 	if (ret != 0)
-		return ret;
+		goto restore_aif;
 
-	regmap_update_bits_async(arizona->regmap,
-				 base + ARIZONA_AIF_BCLK_CTRL,
-				 ARIZONA_AIF1_BCLK_FREQ_MASK, bclk);
-	regmap_update_bits_async(arizona->regmap,
-				 base + ARIZONA_AIF_TX_BCLK_RATE,
-				 ARIZONA_AIF1TX_BCPF_MASK, lrclk);
-	regmap_update_bits_async(arizona->regmap,
-				 base + ARIZONA_AIF_RX_BCLK_RATE,
-				 ARIZONA_AIF1RX_BCPF_MASK, lrclk);
-	regmap_update_bits_async(arizona->regmap,
-				 base + ARIZONA_AIF_FRAME_CTRL_1,
-				 ARIZONA_AIF1TX_WL_MASK |
-				 ARIZONA_AIF1TX_SLOT_LEN_MASK, frame);
-	regmap_update_bits(arizona->regmap, base + ARIZONA_AIF_FRAME_CTRL_2,
-			   ARIZONA_AIF1RX_WL_MASK |
-			   ARIZONA_AIF1RX_SLOT_LEN_MASK, frame);
+	if (reconfig) {
+		regmap_update_bits_async(arizona->regmap,
+					 base + ARIZONA_AIF_BCLK_CTRL,
+					 ARIZONA_AIF1_BCLK_FREQ_MASK, bclk);
+		regmap_update_bits_async(arizona->regmap,
+					 base + ARIZONA_AIF_TX_BCLK_RATE,
+					 ARIZONA_AIF1TX_BCPF_MASK, lrclk);
+		regmap_update_bits_async(arizona->regmap,
+					 base + ARIZONA_AIF_RX_BCLK_RATE,
+					 ARIZONA_AIF1RX_BCPF_MASK, lrclk);
+		regmap_update_bits_async(arizona->regmap,
+					 base + ARIZONA_AIF_FRAME_CTRL_1,
+					 ARIZONA_AIF1TX_WL_MASK |
+					 ARIZONA_AIF1TX_SLOT_LEN_MASK, frame);
+		regmap_update_bits(arizona->regmap,
+				   base + ARIZONA_AIF_FRAME_CTRL_2,
+				   ARIZONA_AIF1RX_WL_MASK |
+				   ARIZONA_AIF1RX_SLOT_LEN_MASK, frame);
+	}
 
-	return 0;
+restore_aif:
+	if (reconfig) {
+		/* Restore AIF TX/RX state */
+		regmap_update_bits_async(arizona->regmap,
+					 base + ARIZONA_AIF_TX_ENABLES,
+					 0xff, aif_tx_state);
+		regmap_update_bits(arizona->regmap,
+				   base + ARIZONA_AIF_RX_ENABLES,
+				   0xff, aif_rx_state);
+	}
+	return ret;
 }
 
 static const char *arizona_dai_clk_str(int clk_id)
-- 
1.7.2.5

--
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/

Powered by blists - more mailing lists