[alsa-devel] [PATCH v8] ASoC: omap-mcbsp: Add PM QoS support for McBSP to prevent glitches
We can get audio errors if hitting deeper idle states on omaps:
[alsa.c:230] error: Fatal problem with alsa output, error -5. [audio.c:614] error: Error in writing audio (Input/output error?)!
This seems to happen with off mode idle enabled as power for the whole SoC may get cut off between filling the McBSP fifo using DMA. While active DMA blocks deeper idle states in hardware, McBSP activity does not seem to do so.
Basing the QoS latency calculation on the FIFO size, threshold, sample rate, and channels.
Based on the original patch by Tony Lindgren Link: https://patchwork.kernel.org/patch/9305867/
Cc: Tony Lindgren tony@atomide.com Cc: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Matt Ranostay matt@ranostay.consulting --- Changes from v1: * add calculations for latency per number of FIFO locations
Changes from v2: * add missing mcbsp.h header change
Changes from v3: * base the latency calculations on threshold, buffer size, sample rate, and channels
Changes from v4: * using Peter Ujfalusi's suggestions for restoring a higher latency on audio stream completion, or if not applicable remove the QoS request
Changes from v5: * clean up latency checking logic * move logic to .prepare and .shutdown to avoid functions that can sleep
Changes from v6: * move QoS removal to asoc_mcbsp_remove from omap_mcbsp_cleanup * also remove header include that is unneeded
Changes from v7: * fix issue reported by Tony Lindgreen that a player application could close the card after hw_params, and cause an invalid pm_qos_remove_request()
sound/soc/omap/mcbsp.h | 3 +++ sound/soc/omap/omap-mcbsp.c | 48 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/sound/soc/omap/mcbsp.h b/sound/soc/omap/mcbsp.h index 61e93b1c185d..46ae1269a698 100644 --- a/sound/soc/omap/mcbsp.h +++ b/sound/soc/omap/mcbsp.h @@ -323,8 +323,11 @@ struct omap_mcbsp {
unsigned int fmt; unsigned int in_freq; + unsigned int latency[2]; int clk_div; int wlen; + + struct pm_qos_request pm_qos_req; };
void omap_mcbsp_config(struct omap_mcbsp *mcbsp, diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index d018e966e533..6b40bdbef336 100644 --- a/sound/soc/omap/omap-mcbsp.c +++ b/sound/soc/omap/omap-mcbsp.c @@ -157,6 +157,17 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + + if (mcbsp->latency[stream2]) + pm_qos_update_request(&mcbsp->pm_qos_req, + mcbsp->latency[stream2]); + else if (mcbsp->latency[stream1]) + pm_qos_remove_request(&mcbsp->pm_qos_req); + + mcbsp->latency[stream1] = 0;
if (!cpu_dai->active) { omap_mcbsp_free(mcbsp); @@ -164,6 +175,28 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, } }
+static int omap_mcbsp_dai_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + struct pm_qos_request *pm_qos_req = &mcbsp->pm_qos_req; + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + int latency = mcbsp->latency[stream2]; + + /* Prevent omap hardware from hitting off between FIFO fills */ + if (!latency || mcbsp->latency[stream1] < latency) + latency = mcbsp->latency[stream1]; + + if (pm_qos_request_active(pm_qos_req)) + pm_qos_update_request(pm_qos_req, latency); + else if (latency) + pm_qos_add_request(pm_qos_req, PM_QOS_CPU_DMA_LATENCY, latency); + + return 0; +} + static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { @@ -226,6 +259,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, int wlen, channels, wpf; int pkt_size = 0; unsigned int format, div, framesize, master; + unsigned int buffer_size = mcbsp->pdata->buffer_size;
dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); channels = params_channels(params); @@ -240,7 +274,9 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, default: return -EINVAL; } - if (mcbsp->pdata->buffer_size) { + if (buffer_size) { + int latency; + if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { int period_words, max_thrsh; int divider = 0; @@ -271,6 +307,12 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, /* Use packet mode for non mono streams */ pkt_size = channels; } + + latency = ((((buffer_size - pkt_size) / channels) * 1000) + / (params->rate_num / params->rate_den)); + + mcbsp->latency[substream->stream] = latency; + omap_mcbsp_set_threshold(substream, pkt_size); }
@@ -554,6 +596,7 @@ static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai, static const struct snd_soc_dai_ops mcbsp_dai_ops = { .startup = omap_mcbsp_dai_startup, .shutdown = omap_mcbsp_dai_shutdown, + .prepare = omap_mcbsp_dai_prepare, .trigger = omap_mcbsp_dai_trigger, .delay = omap_mcbsp_dai_delay, .hw_params = omap_mcbsp_dai_hw_params, @@ -835,6 +878,9 @@ static int asoc_mcbsp_remove(struct platform_device *pdev) if (mcbsp->pdata->ops && mcbsp->pdata->ops->free) mcbsp->pdata->ops->free(mcbsp->id);
+ if (pm_qos_request_active(&mcbsp->pm_qos_req)) + pm_qos_remove_request(&mcbsp->pm_qos_req); + omap_mcbsp_cleanup(mcbsp);
clk_put(mcbsp->fclk);
* Matt Ranostay matt@ranostay.consulting [170117 23:27]:
Changes from v7:
- fix issue reported by Tony Lindgreen that a player application could close the card after hw_params, and cause an invalid pm_qos_remove_request()
OK this version works for me nicely :)
Thanks for taking care of the issue in general:
Tested-by: Tony Lindgren tony@atomide.com
On Wed, Jan 18, 2017 at 9:35 AM, Tony Lindgren tony@atomide.com wrote:
- Matt Ranostay matt@ranostay.consulting [170117 23:27]:
Changes from v7:
- fix issue reported by Tony Lindgreen that a player application could close the card after hw_params, and cause an invalid pm_qos_remove_request()
OK this version works for me nicely :)
*whew* I was getting worried this was going get to the double digits :)
Thanks for taking care of the issue in general:
Tested-by: Tony Lindgren tony@atomide.com
On 01/18/2017 09:26 AM, Matt Ranostay wrote:
We can get audio errors if hitting deeper idle states on omaps:
[alsa.c:230] error: Fatal problem with alsa output, error -5. [audio.c:614] error: Error in writing audio (Input/output error?)!
This seems to happen with off mode idle enabled as power for the whole SoC may get cut off between filling the McBSP fifo using DMA. While active DMA blocks deeper idle states in hardware, McBSP activity does not seem to do so.
Basing the QoS latency calculation on the FIFO size, threshold, sample rate, and channels.
Based on the original patch by Tony Lindgren Link: https://patchwork.kernel.org/patch/9305867/
Acked-by: Peter Ujfalusi peter.ujfalusi@ti.com
Cc: Tony Lindgren tony@atomide.com Cc: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Matt Ranostay matt@ranostay.consulting
Changes from v1:
- add calculations for latency per number of FIFO locations
Changes from v2:
- add missing mcbsp.h header change
Changes from v3:
- base the latency calculations on threshold, buffer size, sample rate, and channels
Changes from v4:
- using Peter Ujfalusi's suggestions for restoring a higher latency on audio stream completion, or if not applicable remove the QoS request
Changes from v5:
- clean up latency checking logic
- move logic to .prepare and .shutdown to avoid functions that can sleep
Changes from v6:
- move QoS removal to asoc_mcbsp_remove from omap_mcbsp_cleanup
- also remove header include that is unneeded
Changes from v7:
- fix issue reported by Tony Lindgreen that a player application could close the card after hw_params, and cause an invalid pm_qos_remove_request()
sound/soc/omap/mcbsp.h | 3 +++ sound/soc/omap/omap-mcbsp.c | 48 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/sound/soc/omap/mcbsp.h b/sound/soc/omap/mcbsp.h index 61e93b1c185d..46ae1269a698 100644 --- a/sound/soc/omap/mcbsp.h +++ b/sound/soc/omap/mcbsp.h @@ -323,8 +323,11 @@ struct omap_mcbsp {
unsigned int fmt; unsigned int in_freq;
- unsigned int latency[2]; int clk_div; int wlen;
- struct pm_qos_request pm_qos_req;
};
void omap_mcbsp_config(struct omap_mcbsp *mcbsp, diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index d018e966e533..6b40bdbef336 100644 --- a/sound/soc/omap/omap-mcbsp.c +++ b/sound/soc/omap/omap-mcbsp.c @@ -157,6 +157,17 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
if (mcbsp->latency[stream2])
pm_qos_update_request(&mcbsp->pm_qos_req,mcbsp->latency[stream2]);else if (mcbsp->latency[stream1])
pm_qos_remove_request(&mcbsp->pm_qos_req);mcbsp->latency[stream1] = 0;
if (!cpu_dai->active) { omap_mcbsp_free(mcbsp);
@@ -164,6 +175,28 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, } }
+static int omap_mcbsp_dai_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)+{
- struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
- struct pm_qos_request *pm_qos_req = &mcbsp->pm_qos_req;
- int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
- int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
- int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
- int latency = mcbsp->latency[stream2];
- /* Prevent omap hardware from hitting off between FIFO fills */
- if (!latency || mcbsp->latency[stream1] < latency)
latency = mcbsp->latency[stream1];- if (pm_qos_request_active(pm_qos_req))
pm_qos_update_request(pm_qos_req, latency);- else if (latency)
pm_qos_add_request(pm_qos_req, PM_QOS_CPU_DMA_LATENCY, latency);- return 0;
+}
static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { @@ -226,6 +259,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, int wlen, channels, wpf; int pkt_size = 0; unsigned int format, div, framesize, master;
unsigned int buffer_size = mcbsp->pdata->buffer_size;
dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); channels = params_channels(params);
@@ -240,7 +274,9 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, default: return -EINVAL; }
- if (mcbsp->pdata->buffer_size) {
- if (buffer_size) {
int latency;- if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { int period_words, max_thrsh; int divider = 0;
@@ -271,6 +307,12 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, /* Use packet mode for non mono streams */ pkt_size = channels; }
latency = ((((buffer_size - pkt_size) / channels) * 1000)/ (params->rate_num / params->rate_den));mcbsp->latency[substream->stream] = latency;- omap_mcbsp_set_threshold(substream, pkt_size); }
@@ -554,6 +596,7 @@ static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai, static const struct snd_soc_dai_ops mcbsp_dai_ops = { .startup = omap_mcbsp_dai_startup, .shutdown = omap_mcbsp_dai_shutdown,
- .prepare = omap_mcbsp_dai_prepare, .trigger = omap_mcbsp_dai_trigger, .delay = omap_mcbsp_dai_delay, .hw_params = omap_mcbsp_dai_hw_params,
@@ -835,6 +878,9 @@ static int asoc_mcbsp_remove(struct platform_device *pdev) if (mcbsp->pdata->ops && mcbsp->pdata->ops->free) mcbsp->pdata->ops->free(mcbsp->id);
if (pm_qos_request_active(&mcbsp->pm_qos_req))
pm_qos_remove_request(&mcbsp->pm_qos_req);omap_mcbsp_cleanup(mcbsp);
clk_put(mcbsp->fclk);
We can get audio errors if hitting deeper idle states on omaps:
[alsa.c:230] error: Fatal problem with alsa output, error -5. [audio.c:614] error: Error in writing audio (Input/output error?)!
This seems to happen with off mode idle enabled as power for the whole SoC may get cut off between filling the McBSP fifo using DMA. While active DMA blocks deeper idle states in hardware, McBSP activity does not seem to do so.
Basing the QoS latency calculation on the FIFO size, threshold, sample rate, and channels.
Based on the original patch by Tony Lindgren Link: https://patchwork.kernel.org/patch/9305867/
From: Matt Ranostay matt@ranostay.consulting Cc: Tony Lindgren tony@atomide.com Cc: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Matt Ranostay matt@ranostay.consulting Tested-by: Tony Lindgren tony@atomide.com Acked-by: Peter Ujfalusi peter.ujfalusi@ti.com --- Changes from v1: * add calculations for latency per number of FIFO locations
Changes from v2: * add missing mcbsp.h header change
Changes from v3: * base the latency calculations on threshold, buffer size, sample rate, and channels
Changes from v4: * using Peter Ujfalusi's suggestions for restoring a higher latency on audio stream completion, or if not applicable remove the QoS request
Changes from v5: * clean up latency checking logic * move logic to .prepare and .shutdown to avoid functions that can sleep
Changes from v6: * move QoS removal to asoc_mcbsp_remove from omap_mcbsp_cleanup * also remove header include that is unneeded
Changes from v7: * fix issue reported by Tony Lindgreen that a player application could close the card after hw_params, and cause an invalid pm_qos_remove_request()
sound/soc/omap/mcbsp.h | 3 +++ sound/soc/omap/omap-mcbsp.c | 48 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/sound/soc/omap/mcbsp.h b/sound/soc/omap/mcbsp.h index 61e93b1c185d..46ae1269a698 100644 --- a/sound/soc/omap/mcbsp.h +++ b/sound/soc/omap/mcbsp.h @@ -323,8 +323,11 @@ struct omap_mcbsp {
unsigned int fmt; unsigned int in_freq; + unsigned int latency[2]; int clk_div; int wlen; + + struct pm_qos_request pm_qos_req; };
void omap_mcbsp_config(struct omap_mcbsp *mcbsp, diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index d018e966e533..6b40bdbef336 100644 --- a/sound/soc/omap/omap-mcbsp.c +++ b/sound/soc/omap/omap-mcbsp.c @@ -157,6 +157,17 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + + if (mcbsp->latency[stream2]) + pm_qos_update_request(&mcbsp->pm_qos_req, + mcbsp->latency[stream2]); + else if (mcbsp->latency[stream1]) + pm_qos_remove_request(&mcbsp->pm_qos_req); + + mcbsp->latency[stream1] = 0;
if (!cpu_dai->active) { omap_mcbsp_free(mcbsp); @@ -164,6 +175,28 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, } }
+static int omap_mcbsp_dai_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + struct pm_qos_request *pm_qos_req = &mcbsp->pm_qos_req; + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + int latency = mcbsp->latency[stream2]; + + /* Prevent omap hardware from hitting off between FIFO fills */ + if (!latency || mcbsp->latency[stream1] < latency) + latency = mcbsp->latency[stream1]; + + if (pm_qos_request_active(pm_qos_req)) + pm_qos_update_request(pm_qos_req, latency); + else if (latency) + pm_qos_add_request(pm_qos_req, PM_QOS_CPU_DMA_LATENCY, latency); + + return 0; +} + static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { @@ -226,6 +259,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, int wlen, channels, wpf; int pkt_size = 0; unsigned int format, div, framesize, master; + unsigned int buffer_size = mcbsp->pdata->buffer_size;
dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); channels = params_channels(params); @@ -240,7 +274,9 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, default: return -EINVAL; } - if (mcbsp->pdata->buffer_size) { + if (buffer_size) { + int latency; + if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { int period_words, max_thrsh; int divider = 0; @@ -271,6 +307,12 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, /* Use packet mode for non mono streams */ pkt_size = channels; } + + latency = ((((buffer_size - pkt_size) / channels) * 1000) + / (params->rate_num / params->rate_den)); + + mcbsp->latency[substream->stream] = latency; + omap_mcbsp_set_threshold(substream, pkt_size); }
@@ -554,6 +596,7 @@ static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai, static const struct snd_soc_dai_ops mcbsp_dai_ops = { .startup = omap_mcbsp_dai_startup, .shutdown = omap_mcbsp_dai_shutdown, + .prepare = omap_mcbsp_dai_prepare, .trigger = omap_mcbsp_dai_trigger, .delay = omap_mcbsp_dai_delay, .hw_params = omap_mcbsp_dai_hw_params, @@ -835,6 +878,9 @@ static int asoc_mcbsp_remove(struct platform_device *pdev) if (mcbsp->pdata->ops && mcbsp->pdata->ops->free) mcbsp->pdata->ops->free(mcbsp->id);
+ if (pm_qos_request_active(&mcbsp->pm_qos_req)) + pm_qos_remove_request(&mcbsp->pm_qos_req); + omap_mcbsp_cleanup(mcbsp);
clk_put(mcbsp->fclk);
On Fri, Jan 27, 2017 at 02:53:37PM -0800, Liam Breck wrote:
Link: https://patchwork.kernel.org/patch/9305867/
From: Matt Ranostay matt@ranostay.consulting Cc: Tony Lindgren tony@atomide.com Cc: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Matt Ranostay matt@ranostay.consulting Tested-by: Tony Lindgren tony@atomide.com Acked-by: Peter Ujfalusi peter.ujfalusi@ti.com
I can't do anything with this as you have not provided a signoff, please see SubmittingPatches for details about what the signoff means and why it's important.
This also seems to be the first time you've sent this to me...
Hi Mark,
On Tue, Jan 31, 2017 at 12:22 PM, Mark Brown broonie@kernel.org wrote:
On Fri, Jan 27, 2017 at 02:53:37PM -0800, Liam Breck wrote:
Link: https://patchwork.kernel.org/patch/9305867/
From: Matt Ranostay matt@ranostay.consulting Cc: Tony Lindgren tony@atomide.com Cc: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Matt Ranostay matt@ranostay.consulting Tested-by: Tony Lindgren tony@atomide.com Acked-by: Peter Ujfalusi peter.ujfalusi@ti.com
I can't do anything with this as you have not provided a signoff, please see SubmittingPatches for details about what the signoff means and why it's important.
This also seems to be the first time you've sent this to me...
I am the sponsor for this patch, but not an author, hence the lack of sign-off. It was started by Tony on linux-omap last summer. You were CC'd then, but not after Matt picked it up at v2.
http://marc.info/?l=linux-omap&m=147266430513700&w=2
Thanks for your help!
~.~
On Tue, Jan 31, 2017 at 12:47:05PM -0800, Liam Breck wrote:
On Tue, Jan 31, 2017 at 12:22 PM, Mark Brown broonie@kernel.org wrote:
I can't do anything with this as you have not provided a signoff, please see SubmittingPatches for details about what the signoff means and why it's important.
I am the sponsor for this patch, but not an author, hence the lack of sign-off. It was started by Tony on linux-omap last summer. You were
That doesn't matter, to repeat please see SubmittingPatches for details of what the signoff means and why it is important.
We can get audio errors if hitting deeper idle states on omaps:
[alsa.c:230] error: Fatal problem with alsa output, error -5. [audio.c:614] error: Error in writing audio (Input/output error?)!
This seems to happen with off mode idle enabled as power for the whole SoC may get cut off between filling the McBSP fifo using DMA. While active DMA blocks deeper idle states in hardware, McBSP activity does not seem to do so.
Basing the QoS latency calculation on the FIFO size, threshold, sample rate, and channels.
Based on the original patch by Tony Lindgren Link: https://patchwork.kernel.org/patch/9305867/
From: Matt Ranostay matt@ranostay.consulting Cc: Tony Lindgren tony@atomide.com Cc: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Matt Ranostay matt@ranostay.consulting Signed-off-by: Liam Breck kernel@networkimprov.net Tested-by: Tony Lindgren tony@atomide.com Acked-by: Peter Ujfalusi peter.ujfalusi@ti.com --- Changes from v1: * add calculations for latency per number of FIFO locations
Changes from v2: * add missing mcbsp.h header change
Changes from v3: * base the latency calculations on threshold, buffer size, sample rate, and channels
Changes from v4: * using Peter Ujfalusi's suggestions for restoring a higher latency on audio stream completion, or if not applicable remove the QoS request
Changes from v5: * clean up latency checking logic * move logic to .prepare and .shutdown to avoid functions that can sleep
Changes from v6: * move QoS removal to asoc_mcbsp_remove from omap_mcbsp_cleanup * also remove header include that is unneeded
Changes from v7: * fix issue reported by Tony Lindgreen that a player application could close the card after hw_params, and cause an invalid pm_qos_remove_request()
sound/soc/omap/mcbsp.h | 3 +++ sound/soc/omap/omap-mcbsp.c | 48 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/sound/soc/omap/mcbsp.h b/sound/soc/omap/mcbsp.h index 61e93b1c185d..46ae1269a698 100644 --- a/sound/soc/omap/mcbsp.h +++ b/sound/soc/omap/mcbsp.h @@ -323,8 +323,11 @@ struct omap_mcbsp {
unsigned int fmt; unsigned int in_freq; + unsigned int latency[2]; int clk_div; int wlen; + + struct pm_qos_request pm_qos_req; };
void omap_mcbsp_config(struct omap_mcbsp *mcbsp, diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index d018e966e533..6b40bdbef336 100644 --- a/sound/soc/omap/omap-mcbsp.c +++ b/sound/soc/omap/omap-mcbsp.c @@ -157,6 +157,17 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + + if (mcbsp->latency[stream2]) + pm_qos_update_request(&mcbsp->pm_qos_req, + mcbsp->latency[stream2]); + else if (mcbsp->latency[stream1]) + pm_qos_remove_request(&mcbsp->pm_qos_req); + + mcbsp->latency[stream1] = 0;
if (!cpu_dai->active) { omap_mcbsp_free(mcbsp); @@ -164,6 +175,28 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, } }
+static int omap_mcbsp_dai_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + struct pm_qos_request *pm_qos_req = &mcbsp->pm_qos_req; + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + int latency = mcbsp->latency[stream2]; + + /* Prevent omap hardware from hitting off between FIFO fills */ + if (!latency || mcbsp->latency[stream1] < latency) + latency = mcbsp->latency[stream1]; + + if (pm_qos_request_active(pm_qos_req)) + pm_qos_update_request(pm_qos_req, latency); + else if (latency) + pm_qos_add_request(pm_qos_req, PM_QOS_CPU_DMA_LATENCY, latency); + + return 0; +} + static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { @@ -226,6 +259,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, int wlen, channels, wpf; int pkt_size = 0; unsigned int format, div, framesize, master; + unsigned int buffer_size = mcbsp->pdata->buffer_size;
dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); channels = params_channels(params); @@ -240,7 +274,9 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, default: return -EINVAL; } - if (mcbsp->pdata->buffer_size) { + if (buffer_size) { + int latency; + if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { int period_words, max_thrsh; int divider = 0; @@ -271,6 +307,12 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, /* Use packet mode for non mono streams */ pkt_size = channels; } + + latency = ((((buffer_size - pkt_size) / channels) * 1000) + / (params->rate_num / params->rate_den)); + + mcbsp->latency[substream->stream] = latency; + omap_mcbsp_set_threshold(substream, pkt_size); }
@@ -554,6 +596,7 @@ static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai, static const struct snd_soc_dai_ops mcbsp_dai_ops = { .startup = omap_mcbsp_dai_startup, .shutdown = omap_mcbsp_dai_shutdown, + .prepare = omap_mcbsp_dai_prepare, .trigger = omap_mcbsp_dai_trigger, .delay = omap_mcbsp_dai_delay, .hw_params = omap_mcbsp_dai_hw_params, @@ -835,6 +878,9 @@ static int asoc_mcbsp_remove(struct platform_device *pdev) if (mcbsp->pdata->ops && mcbsp->pdata->ops->free) mcbsp->pdata->ops->free(mcbsp->id);
+ if (pm_qos_request_active(&mcbsp->pm_qos_req)) + pm_qos_remove_request(&mcbsp->pm_qos_req); + omap_mcbsp_cleanup(mcbsp);
clk_put(mcbsp->fclk);
On Tue, Jan 31, 2017 at 01:21:43PM -0800, Liam Breck wrote:
From: Matt Ranostay matt@ranostay.consulting
This needs to be at the top of the mail to work, IIRC SubmittingPatches covers it (it's useful to try sending the patch to yourself and apply it, helps work out if there's any problems).
From: Matt Ranostay matt@ranostay.consulting
We can get audio errors if hitting deeper idle states on omaps:
[alsa.c:230] error: Fatal problem with alsa output, error -5. [audio.c:614] error: Error in writing audio (Input/output error?)!
This seems to happen with off mode idle enabled as power for the whole SoC may get cut off between filling the McBSP fifo using DMA. While active DMA blocks deeper idle states in hardware, McBSP activity does not seem to do so.
Basing the QoS latency calculation on the FIFO size, threshold, sample rate, and channels.
Based on the original patch by Tony Lindgren Link: https://patchwork.kernel.org/patch/9305867/
Cc: Tony Lindgren tony@atomide.com Cc: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Matt Ranostay matt@ranostay.consulting Signed-off-by: Liam Breck kernel@networkimprov.net Tested-by: Tony Lindgren tony@atomide.com Acked-by: Peter Ujfalusi peter.ujfalusi@ti.com --- Changes from v1: * add calculations for latency per number of FIFO locations
Changes from v2: * add missing mcbsp.h header change
Changes from v3: * base the latency calculations on threshold, buffer size, sample rate, and channels
Changes from v4: * using Peter Ujfalusi's suggestions for restoring a higher latency on audio stream completion, or if not applicable remove the QoS request
Changes from v5: * clean up latency checking logic * move logic to .prepare and .shutdown to avoid functions that can sleep
Changes from v6: * move QoS removal to asoc_mcbsp_remove from omap_mcbsp_cleanup * also remove header include that is unneeded
Changes from v7: * fix issue reported by Tony Lindgreen that a player application could close the card after hw_params, and cause an invalid pm_qos_remove_request()
Changes from v8: 1 add Liam Signed-off-by 2 move From line
sound/soc/omap/mcbsp.h | 3 +++ sound/soc/omap/omap-mcbsp.c | 48 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/sound/soc/omap/mcbsp.h b/sound/soc/omap/mcbsp.h index 61e93b1c185d..46ae1269a698 100644 --- a/sound/soc/omap/mcbsp.h +++ b/sound/soc/omap/mcbsp.h @@ -323,8 +323,11 @@ struct omap_mcbsp {
unsigned int fmt; unsigned int in_freq; + unsigned int latency[2]; int clk_div; int wlen; + + struct pm_qos_request pm_qos_req; };
void omap_mcbsp_config(struct omap_mcbsp *mcbsp, diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index d018e966e533..6b40bdbef336 100644 --- a/sound/soc/omap/omap-mcbsp.c +++ b/sound/soc/omap/omap-mcbsp.c @@ -157,6 +157,17 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + + if (mcbsp->latency[stream2]) + pm_qos_update_request(&mcbsp->pm_qos_req, + mcbsp->latency[stream2]); + else if (mcbsp->latency[stream1]) + pm_qos_remove_request(&mcbsp->pm_qos_req); + + mcbsp->latency[stream1] = 0;
if (!cpu_dai->active) { omap_mcbsp_free(mcbsp); @@ -164,6 +175,28 @@ static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, } }
+static int omap_mcbsp_dai_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); + struct pm_qos_request *pm_qos_req = &mcbsp->pm_qos_req; + int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; + int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; + int latency = mcbsp->latency[stream2]; + + /* Prevent omap hardware from hitting off between FIFO fills */ + if (!latency || mcbsp->latency[stream1] < latency) + latency = mcbsp->latency[stream1]; + + if (pm_qos_request_active(pm_qos_req)) + pm_qos_update_request(pm_qos_req, latency); + else if (latency) + pm_qos_add_request(pm_qos_req, PM_QOS_CPU_DMA_LATENCY, latency); + + return 0; +} + static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { @@ -226,6 +259,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, int wlen, channels, wpf; int pkt_size = 0; unsigned int format, div, framesize, master; + unsigned int buffer_size = mcbsp->pdata->buffer_size;
dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); channels = params_channels(params); @@ -240,7 +274,9 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, default: return -EINVAL; } - if (mcbsp->pdata->buffer_size) { + if (buffer_size) { + int latency; + if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { int period_words, max_thrsh; int divider = 0; @@ -271,6 +307,12 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, /* Use packet mode for non mono streams */ pkt_size = channels; } + + latency = ((((buffer_size - pkt_size) / channels) * 1000) + / (params->rate_num / params->rate_den)); + + mcbsp->latency[substream->stream] = latency; + omap_mcbsp_set_threshold(substream, pkt_size); }
@@ -554,6 +596,7 @@ static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai, static const struct snd_soc_dai_ops mcbsp_dai_ops = { .startup = omap_mcbsp_dai_startup, .shutdown = omap_mcbsp_dai_shutdown, + .prepare = omap_mcbsp_dai_prepare, .trigger = omap_mcbsp_dai_trigger, .delay = omap_mcbsp_dai_delay, .hw_params = omap_mcbsp_dai_hw_params, @@ -835,6 +878,9 @@ static int asoc_mcbsp_remove(struct platform_device *pdev) if (mcbsp->pdata->ops && mcbsp->pdata->ops->free) mcbsp->pdata->ops->free(mcbsp->id);
+ if (pm_qos_request_active(&mcbsp->pm_qos_req)) + pm_qos_remove_request(&mcbsp->pm_qos_req); + omap_mcbsp_cleanup(mcbsp);
clk_put(mcbsp->fclk);
On Wed, Feb 01, 2017 at 12:07:42PM -0800, Liam Breck wrote:
From: Matt Ranostay matt@ranostay.consulting
We can get audio errors if hitting deeper idle states on omaps:
I already applied this, if there's any changes needed please send incremental changes.
participants (5)
-
Liam Breck -
Mark Brown -
Matt Ranostay -
Peter Ujfalusi -
Tony Lindgren