From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
Cc: alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org,
patches-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org,
Liam Girdwood <lrg-l0cyMroinI0@public.gmane.org>,
Mark Brown
<broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Marcel Ziswiler
<marcel.ziswiler-2KBjVHiyJgBBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [PATCH 5/7] ASoC: tegra: add ac97 host driver
Date: Thu, 20 Dec 2012 13:19:43 -0700 [thread overview]
Message-ID: <50D372DF.2080600@wwwdotorg.org> (raw)
In-Reply-To: <1356034241.1490.98.camel@tellur>
On 12/20/2012 01:10 PM, Lucas Stach wrote:
> Am Donnerstag, den 20.12.2012, 12:44 -0700 schrieb Stephen Warren:
>> On 12/19/2012 04:17 PM, Lucas Stach wrote:
>>> This adds the driver for the Tegra 2x AC97 host controller.
>>> +static void tegra20_ac97_codec_warm_reset(struct snd_ac97 *ac97)
>>> +{
>>> + u32 readback;
>>> + unsigned long timeout;
>>> +
>>> + /*
>>> + * although sync line is driven by the DAC pad group warm reset using
>>> + * the controller cmd is not working, have to toggle sync line
>>> + * manually.
>>> + */
>>> + gpio_request(workdata->sync_gpio, "codec-sync");
>>
>> Hmm. There's an AC'97 command to reset the CODEC and we don't implement
>> it? Uggh.
>
> As far as I could figure from the downstream register doc there is a
> command implemented in the host controller that's supposed to do the
> warm reset, but in my testing it didn't work. Sadly I have not received
> any documentation about the host controller from NVIDIA up until now, so
> I don't now if we could make this work somehow. Bug Submission ID#:
> 196075
What system was that bug submitted into? It's not a regular NVIDIA
internal bug number. I'll see who I can ask about this feature...
>>> + ac97->sync_gpio = of_get_named_gpio(pdev->dev.of_node,
>>> + "nvidia,codec-sync-gpio", 0);
>>> + if (!gpio_is_valid(ac97->sync_gpio)) {
>>> + dev_err(&pdev->dev, "no codec-sync GPIO supplied\n");
>>> + goto err_clk_put;
>>> + }
>>
>> I don't know what this is, so I'll ask if it's strictly required too.
>
> Until we manage to get the host controller warm reset command working
> this is fixed to be the _FS line of the DAP connected to the codec, so
> strictly required.
I'd like to investigate whether the warm reset command can be made to
work before actually committing to a DT binding that requires this GPIO
to be specified; the DT binding is supposed to be basically static.
next prev parent reply other threads:[~2012-12-20 20:19 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-19 23:17 [PATCH 1/7] ARM: tegra: add ac97 clock Lucas Stach
[not found] ` <1355959056-6009-1-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2012-12-19 23:17 ` [PATCH 2/7] ASoC: allow wolfson wm9712 codec to be instantiated using device tree Lucas Stach
[not found] ` <1355959056-6009-2-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2012-12-20 9:32 ` Mark Brown
2012-12-19 23:17 ` [PATCH 3/7] ASoC: tegra: setup DAP3<->DAC3 connection by default Lucas Stach
[not found] ` <1355959056-6009-3-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2012-12-20 19:20 ` Stephen Warren
2012-12-24 16:01 ` Mark Brown
2012-12-19 23:17 ` [PATCH 4/7] ASoC: tegra: add function to set ac97 rate Lucas Stach
[not found] ` <1355959056-6009-4-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2012-12-20 19:22 ` Stephen Warren
2012-12-24 16:00 ` Mark Brown
2012-12-19 23:17 ` [PATCH 5/7] ASoC: tegra: add ac97 host driver Lucas Stach
[not found] ` <1355959056-6009-5-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2012-12-20 19:44 ` Stephen Warren
[not found] ` <50D36A98.7090204-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-12-20 20:10 ` Lucas Stach
2012-12-20 20:19 ` Stephen Warren [this message]
[not found] ` <50D372DF.2080600-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-12-20 20:32 ` Lucas Stach
2012-12-20 20:23 ` Mark Brown
2012-12-19 23:17 ` [PATCH 6/7] ASoC: tegra: add ac97 host controller to device tree Lucas Stach
[not found] ` <1355959056-6009-6-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2012-12-20 19:47 ` Stephen Warren
2012-12-19 23:17 ` [PATCH 7/7] ASoC: tegra: add machine driver using wm9712 codec Lucas Stach
[not found] ` <1355959056-6009-7-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2012-12-20 19:55 ` Stephen Warren
[not found] ` <50D36D3B.7080309-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-12-20 20:16 ` Mark Brown
2012-12-20 19:24 ` [PATCH 1/7] ARM: tegra: add ac97 clock Stephen Warren
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