From 19f52fae5adb7f2fd5b75251f9bd761f43a36476 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Mon, 29 Dec 2014 18:43:36 +0100 Subject: [PATCH 1/3] ALSA: Fix handling of multiple msbits constraints on the same runtime If the sound card is made up of discrete components, each with their own driver (e.g. like in the ASoC case), we might end up with multiple msbits constraint rules installed. Currently this will result in msbits being set to whatever the last rule set it to. This patch updates the behavior of the rule to choose the minimum (other than zero) of all the installed rules. Signed-off-by: Lars-Peter Clausen Signed-off-by: Takashi Iwai --- sound/core/pcm_lib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index ec9e7866177f..b0c153534a29 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1300,7 +1300,7 @@ static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, unsigned int msbits = l >> 16; struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); if (snd_interval_single(i) && snd_interval_value(i) == width) - params->msbits = msbits; + params->msbits = min_not_zero(params->msbits, msbits); return 0; } From 8ef9df55a72425e269575fa74cbbedec4672bdc4 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Mon, 29 Dec 2014 18:43:37 +0100 Subject: [PATCH 2/3] ALSA: Add support for wildcard msbits constraints Currently the msbits constraints requires to specify a specific sample format width for which the constraint should be applied. But often the number of most significant bits is not sample format specific, but rather a absolute limit. E.g. the PCM interface might accept 32-bit and 24-bit samples, but the DAC has a 16-bit resolution and throws away the LSBs. In this case for both 32-bit and 24-bit format msbits should be set to 16. This patch extends snd_pcm_hw_constraint_msbits() so that a wildcard constraint can be setup that is applied for all formats with a sample width larger than the specified msbits. Choosing the wildcard constraint is done by setting the sample width parameter of the function to 0. Signed-off-by: Lars-Peter Clausen Signed-off-by: Takashi Iwai --- sound/core/pcm_lib.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index b0c153534a29..db05e04d0070 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1299,8 +1299,14 @@ static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, int width = l & 0xffff; unsigned int msbits = l >> 16; struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); - if (snd_interval_single(i) && snd_interval_value(i) == width) + + if (!snd_interval_single(i)) + return 0; + + if ((snd_interval_value(i) == width) || + (width == 0 && snd_interval_value(i) > msbits)) params->msbits = min_not_zero(params->msbits, msbits); + return 0; } @@ -1311,6 +1317,11 @@ static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, * @width: sample bits width * @msbits: msbits width * + * This constraint will set the number of most significant bits (msbits) if a + * sample format with the specified width has been select. If width is set to 0 + * the msbits will be set for any sample format with a width larger than the + * specified msbits. + * * Return: Zero if successful, or a negative error code on failure. */ int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, From 0e2a37513a1fafa0b9829e992633a80861c3b4b5 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Mon, 29 Dec 2014 18:43:38 +0100 Subject: [PATCH 3/3] ASoC: pcm: Use wildcard msbits constraints Use the new wildcard msbits constraints instead of installing a constraint for each available sample format width. Signed-off-by: Lars-Peter Clausen Acked-by: Mark Brown Signed-off-by: Takashi Iwai --- sound/soc/soc-pcm.c | 24 ++++-------------------- 1 file changed, 4 insertions(+), 20 deletions(-) diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index eb87d96e2cf0..d62d6a5340a8 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -301,15 +301,6 @@ static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream) return symmetry; } -/* - * List of sample sizes that might go over the bus for parameter - * application. There ought to be a wildcard sample size for things - * like the DAC/ADC resolution to use but there isn't right now. - */ -static int sample_sizes[] = { - 24, 32, -}; - static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits) { struct snd_soc_pcm_runtime *rtd = substream->private_data; @@ -318,17 +309,10 @@ static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits) if (!bits) return; - for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) { - if (bits >= sample_sizes[i]) - continue; - - ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, - sample_sizes[i], bits); - if (ret != 0) - dev_warn(rtd->dev, - "ASoC: Failed to set MSB %d/%d: %d\n", - bits, sample_sizes[i], ret); - } + ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits); + if (ret != 0) + dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n", + bits, ret); } static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)