Re: [PATCH v2] ASoC: qcom: Fix for DMA interrupt clear reg overwriting

[Srinivasa Rao Mandadapu]

Hi Srini,

Thanks for your review comments!!!

On 6/7/2021 8:20 PM, Srinivas Kandagatla wrote:
> On 05/06/2021 12:38, Srinivasa Rao Mandadapu wrote:
> > The DMA interrupt clear register overwritten during
> > simultaneous playback and capture in lpass platform
> > interrupt handler. It's causing playback or capture stuck
> > in similtaneous plaback on speaker and capture on dmic test.
> > Update appropriate reg fields of corresponding channel instead
> > of entire register write.
> >
> > Fixes: commit c5c8635a04711 ("ASoC: qcom: Add LPASS platform driver")
> >
> > Signed-off-by: Srinivasa Rao Mandadapu <srivasam@xxxxxxxxxxxxxx>
> > ---
> >   sound/soc/qcom/lpass-platform.c | 17 +++++++++++------
> >   1 file changed, 11 insertions(+), 6 deletions(-)
> >
> > diff --git a/sound/soc/qcom/lpass-platform.c 
> > b/sound/soc/qcom/lpass-platform.c
> > index 0df9481ea4c6..f220a2739ac3 100644
> > --- a/sound/soc/qcom/lpass-platform.c
> > +++ b/sound/soc/qcom/lpass-platform.c
> > @@ -526,7 +526,7 @@ static int lpass_platform_pcmops_trigger(struct 
> > snd_soc_component *component,
> >               return -EINVAL;
> >           }
> >   -        ret = regmap_write(map, reg_irqclr, val_irqclr);
> > +        ret = regmap_update_bits(map, reg_irqclr, val_irqclr, 
> > val_irqclr);
> >           if (ret) {
> >               dev_err(soc_runtime->dev, "error writing to irqclear 
> > reg: %d\n", ret);
> >               return ret;
> > @@ -650,7 +650,7 @@ static irqreturn_t lpass_dma_interrupt_handler(
> >       struct lpass_variant *v = drvdata->variant;
> >       irqreturn_t ret = IRQ_NONE;
> >       int rv;
> > -    unsigned int reg = 0, val = 0;
> > +    unsigned int reg, val, val_clr, val_mask;
>
> minor nit here, variable name val_clr is pretty confusing to readers, 
> It might be okay for irq clr register but we are using the same name 
> of writing to other registers. So can I suggest you to reuse val 
> variable.
>
> other thing is val_mask, please rename this to mask and just set it in 
> the start of function so you can avoid 3 extra lines below.
Ok will do accordingly and repost patch.
> Other than that patch looks good to me!
>
> --srini
> >       struct regmap *map;
> >       unsigned int dai_id = cpu_dai->driver->id;
> >   @@ -676,8 +676,9 @@ static irqreturn_t lpass_dma_interrupt_handler(
> >       return -EINVAL;
> >       }
> >       if (interrupts & LPAIF_IRQ_PER(chan)) {
> > -
> > -        rv = regmap_write(map, reg, LPAIF_IRQ_PER(chan) | val);
> > +        val_clr = LPAIF_IRQ_PER(chan) | val;
> > +        val_mask = LPAIF_IRQ_ALL(chan);
> > +        rv = regmap_update_bits(map, reg, val_mask, val_clr);
> >           if (rv) {
> >               dev_err(soc_runtime->dev,
> >                   "error writing to irqclear reg: %d\n", rv);
> > @@ -688,7 +689,9 @@ static irqreturn_t lpass_dma_interrupt_handler(
> >       }
> >         if (interrupts & LPAIF_IRQ_XRUN(chan)) {
> > -        rv = regmap_write(map, reg, LPAIF_IRQ_XRUN(chan) | val);
> > +        val_clr = (LPAIF_IRQ_XRUN(chan) | val);
> > +        val_mask = LPAIF_IRQ_ALL(chan);
> > +        rv = regmap_update_bits(map, reg, val_mask, val_clr);
> >           if (rv) {
> >               dev_err(soc_runtime->dev,
> >                   "error writing to irqclear reg: %d\n", rv);
> > @@ -700,7 +703,9 @@ static irqreturn_t lpass_dma_interrupt_handler(
> >       }
> >         if (interrupts & LPAIF_IRQ_ERR(chan)) {
> > -        rv = regmap_write(map, reg, LPAIF_IRQ_ERR(chan) | val);
> > +        val_clr = (LPAIF_IRQ_ERR(chan) | val);
> > +        val_mask = LPAIF_IRQ_ALL(chan);
> > +        rv = regmap_update_bits(map, reg, val_mask, val_clr);
> >           if (rv) {
> >               dev_err(soc_runtime->dev,
> >                   "error writing to irqclear reg: %d\n", rv);
--
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