linux-kernel - Re: [PATCH v2 2/4] ALSA: hda: Rework snd_hdac_stream

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Date:   Wed, 5 Oct 2022 14:52:01 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Mohan Kumar D <mkumard@...dia.com>
Subject: Re: [PATCH v2 2/4] ALSA: hda: Rework snd_hdac_stream_reset() to use
 macros


On 05/10/2022 13:29, Takashi Iwai wrote:

...

>> HDA playback is failing on -next for various Tegra boards. Bisect is
>> point to this commit and reverting it fixes the problem. I was a bit
>> puzzled why this change is causing a problem, but looking closer there
>> is a difference between the previous code that was calling
>> snd_hdac_stream_readb() and the new code that is calling
>> snd_hdac_stream_readb_poll(). The function snd_hdac_stream_readb()
>> calls snd_hdac_aligned_mmio() is see if the device has an aligned MMIO
>> which Tegra does and then would call snd_hdac_aligned_read(). However,
>> now the code always call readb() and this is breaking Tegra.
>>
>> So it is either necessary to update snd_hdac_stream_readb_poll() to
>> handle this or revert this change.
> 
> Does the patch below work?
> 
> 
> thanks,
> 
> Takashi
> 
> -- 8< --
> --- a/include/sound/hdaudio.h
> +++ b/include/sound/hdaudio.h
> @@ -592,8 +592,8 @@ int snd_hdac_get_stream_stripe_ctl(struct hdac_bus *bus,
>   #define snd_hdac_stream_readb(dev, reg) \
>   	snd_hdac_reg_readb((dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg)
>   #define snd_hdac_stream_readb_poll(dev, reg, val, cond, delay_us, timeout_us) \
> -	readb_poll_timeout((dev)->sd_addr + AZX_REG_ ## reg, val, cond, \
> -			   delay_us, timeout_us)
> +	read_poll_timeout(snd_hdac_reg_readb, val, cond, delay_us, timeout_us,\
> +			  false, (dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg)
>   #define snd_hdac_stream_readl_poll(dev, reg, val, cond, delay_us, timeout_us) \
>   	readl_poll_timeout((dev)->sd_addr + AZX_REG_ ## reg, val, cond, \
>   			   delay_us, timeout_us)


Amazingly it does not work. I would have thought that would, but it does 
not. I am a bit puzzled by that?

Jon

-- 
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