linux-kernel - Re: [alsa-devel] [PATCH 5/9] ASoC: tegra: add Tegra210 based AHUB driver

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Message-ID: <d160fa01-27d0-6290-cb16-07d159d6fbb2@nvidia.com>
Date:   Fri, 24 Jan 2020 09:09:09 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <robh+dt@...nel.org>
CC:     <spujar@...dia.com>, <devicetree@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <atalambedu@...dia.com>,
        <linux-kernel@...r.kernel.org>, <lgirdwood@...il.com>,
        <jonathanh@...dia.com>, <viswanathl@...dia.com>,
        <sharadg@...dia.com>, <broonie@...nel.org>,
        <thierry.reding@...il.com>, <linux-tegra@...r.kernel.org>,
        <rlokhande@...dia.com>, <mkumard@...dia.com>, <dramesh@...dia.com>
Subject: Re: [alsa-devel] [PATCH 5/9] ASoC: tegra: add Tegra210 based AHUB
 driver



On 1/24/2020 6:48 AM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
>
>
> 20.01.2020 17:23, Sameer Pujar пишет:
> [snip]
>> +static int tegra_ahub_get_value_enum(struct snd_kcontrol *kctl,
>> +                                  struct snd_ctl_elem_value *uctl)
>> +{
>> +     struct snd_soc_component *cmpnt = snd_soc_dapm_kcontrol_component(kctl);
>> +     struct tegra_ahub *ahub = snd_soc_component_get_drvdata(cmpnt);
>> +     struct soc_enum *e = (struct soc_enum *)kctl->private_value;
>> +     unsigned int reg, i, bit_pos = 0;
>> +
>> +     /*
>> +      * Find the bit position of current MUX input.
>> +      * If nothing is set, position would be 0 and it corresponds to 'None'.
>> +      */
>> +     for (i = 0; i < ahub->soc_data->reg_count; i++) {
>> +             unsigned int reg_val;
>> +
>> +             reg = e->reg + (TEGRA210_XBAR_PART1_RX * i);
>> +             snd_soc_component_read(cmpnt, reg, &reg_val);
>> +             reg_val &= ahub->soc_data->mask[i];
>> +
>> +             if (reg_val) {
>> +                     bit_pos = ffs(reg_val) +
>> +                               (8 * cmpnt->val_bytes * i);
> Multiplication takes precedence, braces are not needed. Same for all
> other occurrences in the code.
>
> [snip]
>> +                     break;
>> +             }
>> +     }
>> +
>> +     /* Find index related to the item in array *_ahub_mux_texts[] */
>> +     for (i = 0; i < e->items; i++) {
>> +             if (bit_pos == e->values[i]) {
>> +                     uctl->value.enumerated.item[0] = i;
>> +                     break;
>> +             }
>> +     }
>> +
>> +     return 0;
>> +}
>> +
>> +static int tegra_ahub_put_value_enum(struct snd_kcontrol *kctl,
>> +                                  struct snd_ctl_elem_value *uctl)
>> +{
>> +     struct snd_soc_component *cmpnt = snd_soc_dapm_kcontrol_component(kctl);
>> +     struct tegra_ahub *ahub = snd_soc_component_get_drvdata(cmpnt);
>> +     struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctl);
>> +     struct soc_enum *e = (struct soc_enum *)kctl->private_value;
>> +     struct snd_soc_dapm_update update[TEGRA_XBAR_UPDATE_MAX_REG] = { };
> Shouldn't this be {0} to make array zero'ed?

Isn't it the same with empty braces?
>
> [snip]
>> +static int tegra_ahub_probe(struct platform_device *pdev)
>> +{
>> +     const struct of_device_id *match;
>> +     struct tegra_ahub *ahub;
>> +     struct tegra_ahub_soc_data *soc_data;
>> +     void __iomem *regs;
>> +     struct resource *res;
>> +     int ret;
>> +
>> +     match = of_match_device(tegra_ahub_of_match, &pdev->dev);
>> +     if (!match) {
>> +             dev_err(&pdev->dev, "error: no device match found\n");
>> +             return -ENODEV;
>> +     }
>> +
>> +     soc_data = (struct tegra_ahub_soc_data *)match->data;
> soc_data = device_get_match_data(&pdev->dev);

will update
>> +     ahub = devm_kcalloc(&pdev->dev, 1, sizeof(*ahub), GFP_KERNEL);
>> +     if (!ahub)
>> +             return -ENOMEM;
>> +
>> +     ahub->soc_data = soc_data;
>> +
>> +     platform_set_drvdata(pdev, ahub);
>> +
>> +     ahub->clk = devm_clk_get(&pdev->dev, "ahub");
>> +     if (IS_ERR(ahub->clk)) {
>> +             dev_err(&pdev->dev, "can't retrieve AHUB clock\n");
>> +             return PTR_ERR(ahub->clk);
>> +     }
>> +
>> +     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +
>> +     regs = devm_ioremap_resource(&pdev->dev, res);
>> +     if (IS_ERR(regs))
>> +             return PTR_ERR(regs);
> regs = devm_platform_ioremap_resource(pdev, 0);

will update