linux-kernel - Re: [PATCH] ALSA: hda: Zhaoxin: Add HDAC PCI IDs and HDMI Codec Vendor IDs

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Message-ID: <87v8e0bjx4.wl-tiwai@suse.de>
Date:   Mon, 31 Jul 2023 09:48:55 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Tony W Wang-oc <TonyWWang-oc@...oxin.com>
Cc:     <perex@...ex.cz>, <tiwai@...e.com>,
        <pierre-louis.bossart@...ux.intel.com>,
        <zhangyiqun@...tium.com.cn>, <peter.ujfalusi@...ux.intel.com>,
        <broonie@...nel.org>, <chenhuacai@...nel.org>,
        <cezary.rojewski@...el.com>, <siyanteng@...ngson.cn>,
        <amadeuszx.slawinski@...ux.intel.com>, <evan.quan@....com>,
        <jasontao@...nfly.com>, <kai.vehmanen@...ux.intel.com>,
        <ranjani.sridharan@...ux.intel.com>, <mkumard@...dia.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <CobeChen@...oxin.com>, <TimGuo@...oxin.com>,
        <LeoLiu-oc@...oxin.com>
Subject: Re: [PATCH] ALSA: hda: Zhaoxin: Add HDAC PCI IDs and HDMI Codec Vendor IDs

On Mon, 31 Jul 2023 07:59:32 +0200,
Tony W Wang-oc wrote:
> @@ -1044,6 +1044,16 @@ void azx_stop_chip(struct azx *chip)
>  }
>  EXPORT_SYMBOL_GPL(azx_stop_chip);
>  
> +static void azx_rirb_zxdelay(struct azx *chip, int enable)

It'd be helpful to have a brief function description.  It doesn't do
any delaying but flip something instead, right?

> +{
> +	if (chip->remap_diu_addr) {
> +		if (!enable)
> +			writel(0x0, (char *)chip->remap_diu_addr + 0x490a8);
> +		else
> +			writel(0x1000000, (char *)chip->remap_diu_addr + 0x490a8);

Avoid magic numbers, but define them.

> @@ -1103,9 +1113,14 @@ irqreturn_t azx_interrupt(int irq, void *dev_id)
>  			azx_writeb(chip, RIRBSTS, RIRB_INT_MASK);
>  			active = true;
>  			if (status & RIRB_INT_RESPONSE) {
> -				if (chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND)
> +				if ((chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND) ||
> +					(chip->driver_caps & AZX_DCAPS_RIRB_PRE_DELAY)) {
> +					azx_rirb_zxdelay(chip, 1);
>  					udelay(80);

Calling it here looks a bit misleading, especially because it's paired
with a later call.  Better to put another if block that matches with
both calls consistently.

> +				}
>  				snd_hdac_bus_update_rirb(bus);
> +				if (chip->driver_caps & AZX_DCAPS_RIRB_PRE_DELAY)
> +					azx_rirb_zxdelay(chip, 0);

I meant this one.

> @@ -145,6 +146,7 @@ struct azx {
>  
>  	/* GTS present */
>  	unsigned int gts_present:1;
> +	void __iomem *remap_diu_addr;

This is a completely different thing, give some comment.


> +static int azx_init_pci_zx(struct azx *chip)
> +{
> +	struct snd_card *card = chip->card;
> +	unsigned int diu_reg;
> +	struct pci_dev *diu_pci = NULL;
> +
> +	diu_pci = pci_get_device(PCI_VENDOR_ID_ZHAOXIN, 0x3a03, NULL);
> +	if (!diu_pci) {
> +		dev_err(card->dev, "hda no KX-5000 device.\n");
> +		return -ENXIO;
> +	}
> +	pci_read_config_dword(diu_pci, PCI_BASE_ADDRESS_0, &diu_reg);
> +	chip->remap_diu_addr = ioremap(diu_reg, 0x50000);
> +	dev_info(card->dev, "hda %x %p\n", diu_reg, chip->remap_diu_addr);
> +	return 0;

Missing pci_dev_put()?

> @@ -1360,6 +1385,10 @@ static void azx_free(struct azx *chip)
>  	hda->init_failed = 1; /* to be sure */
>  	complete_all(&hda->probe_wait);
>  
> +	if (chip->driver_type == AZX_DRIVER_ZHAOXINHDMI) {
> +		azx_free_pci_zx(chip);
> +	}

Superfluous parentheses.

> @@ -1876,6 +1906,10 @@ static int azx_first_init(struct azx *chip)
>  		bus->access_sdnctl_in_dword = 1;
>  	}
>  
> +	chip->remap_diu_addr = NULL;
> +	if (chip->driver_type == AZX_DRIVER_ZHAOXINHDMI)
> +		azx_init_pci_zx(chip);

No error check?  It doesn't look too serious even if the driver
continues to load, though.

> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -4501,6 +4501,8 @@ static int patch_gf_hdmi(struct hda_codec *codec)
>  	return 0;
>  }
>  
> +static int patch_zx_hdmi(struct hda_codec *codec) { return patch_gf_hdmi(codec); }

Don't put in a single line.
Or, if it's the very same function, you can rather call patch_gf_hdmi
directly in the table.


thanks,

Takashi