linux-kernel - [PATCH v2 0/2] fix tegra-hda on tegra30 devices

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Message-Id: <20210108135913.2421585-1-pgwipeout@gmail.com>
Date:   Fri,  8 Jan 2021 13:59:11 +0000
From:   Peter Geis <pgwipeout@...il.com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Sameer Pujar <spujar@...dia.com>,
        Mohan Kumar <mkumard@...dia.com>
Cc:     linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        Peter Geis <pgwipeout@...il.com>
Subject: [PATCH v2 0/2] fix tegra-hda on tegra30 devices

The following patches fix tegra-hda on legacy tegra devices.
Two issues were discovered preventing tegra-hda from functioning:
-The hda clocks on tegra30 were assigned to clk_m and running at too low
of a rate to function.
-The tegra-hda encounters an input/output error when opening a stream.

Since the only mainline device that used tegra-hda until recently was the
t124, it is unknown exactly when this was broken. Fortunately a recent
patch was submitted that fixed the issue only on t194 devices. We can
apply it to the tegra30-hda device to resolve the issue across the board.
Note that downstream devices used the spdif device instead of hda for hdmi
audio. The spdif device lacks a driver on mainline.

-Checkpatch seems to have issues finding [1], but git show has no issue.
[1] commit 60019d8c650d ("ALSA: hda/tegra: workaround playback failure on
Tegra194")

Changelog:

v2:
-Added ack and reviewed-by from Jon
-Updated fix to apply to tegra30-hda vice universally (Thanks Jon)
-Updated commit to include comments from hardware team (Thanks Sameer)
-Cleaned up commit messages

Peter Geis (2):
  clk: tegra30: Add hda clock default rates to clock driver
  ALSA: hda/tegra: fix tegra-hda on tegra30 soc

 drivers/clk/tegra/clk-tegra30.c | 2 ++
 sound/pci/hda/hda_tegra.c       | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

-- 
2.25.1