linux-kernel - Re: [PATCH 0/3] Tegra194 HW Fixes

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Date:   Mon, 04 May 2020 11:53:44 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     <perex@...ex.cz>, <tiwai@...e.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <linux-tegra@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <sharadg@...dia.com>, <mkumard@...dia.com>,
        <viswanathl@...dia.com>, <rlokhande@...dia.com>,
        <dramesh@...dia.com>, <atalambedu@...dia.com>
Subject: Re: [PATCH 0/3] Tegra194 HW Fixes

On Mon, 04 May 2020 10:48:46 +0200,
Sameer Pujar wrote:
> 
> 
> 
> On 5/4/2020 2:05 PM, Sameer Pujar wrote:
> >
> >
> > On 5/4/2020 1:59 PM, Takashi Iwai wrote:
> >> External email: Use caution opening links or attachments
> >>
> >>
> >> On Mon, 04 May 2020 10:16:13 +0200,
> >> Sameer Pujar wrote:
> >>> This series proposes SW workarounds for Tegra194 HDA HW bugs.
> >>> Following are the two issues seen:
> >>>   1. GCAP register does not reflect true capability.
> >>>      The actual number of SDO lines is "4", where as it reflects "2".
> >>>   2. With 4 SDO line configuration playback fails for,
> >>>      44.1K/48K, 2-channel, 16-bps audio stream.
> >>>
> >>> After fixing [1], issue [2] is uncovered.
> >>> As per recommendation by Tegra HW team the workarounds are pushed.
> >>>
> >>> Testing done
> >>> ============
> >>>   * Verify GCAP register after registering HDA sound card
> >>>   * Verify audio playback for 44.1K/48K, 2-channel, 16-bps.
> >>>
> >>> Sameer Pujar (3):
> >>>    ALSA: hda/tegra: correct number of SDO lines for Tegra194
> >>>    ALSA: hda: add member to store ratio for stripe control
> >>>    ALSA: hda/tegra: workaround playback failure on Tegra194
> >> Through a quick glance, all changes look good.
> >>
> >> Is the device already in market, i.e. it had hit users?  If yes, I'm
> >> going to merge for 5.7, otherwise for 5.8.
> >
> > Yes the device is in the market. But has not been reported by end users.
> > During internal resting this has been discovered. I am fine with
> > merging this to 5.8.
> 
> To add, end users currently won't see this problem because things work
> fine with 2-SDO lines. The issue is seen when Tegra194 is allowed to
> utilize its actual capability of 4-SDO lines.

Thanks for the information.  Then I queued all three patches now to
for-next branch destined for 5.8.


Takashi