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

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Message-ID: <8028139e-fe25-bb9e-3038-5180bc5f8ca3@codeaurora.org>
Date:   Mon, 7 Jun 2021 20:34:06 +0530
From:   Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, plai@...eaurora.org,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        rohitkr@...eaurora.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, swboyd@...omium.org,
        judyhsiao@...omium.org
Subject: Re: [PATCH v2] ASoC: qcom: Fix for DMA interrupt clear reg
 overwriting

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@...eaurora.org>
>> ---
>>   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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is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.