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

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Date:   Mon, 31 Jul 2023 19:36:01 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     Takashi Iwai <tiwai@...e.de>
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 7/31/23 15:48, Takashi Iwai wrote:
> 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?

Yes, you are right.
This function expects to implement two functions: Adjust the priority of
write cycles for KX-5000 and delay some time. Now its only implement the
first function.

> 
>> +{
>> +	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.
> 

Got it.
This solution operate the register inside the GPU witch do not belong to
HDAC. So will evaluate this patch method again.

>> @@ -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.
> 
Ok.

>> +				}
>>  				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.
> 
Its belong to GPU MMIO.

> 
>> +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()?
> 
Yes.

>> @@ -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.
> 

Ok.
> 
> thanks,
> 
> Takashi