The patch

ASoC: uniphier: Fix double reset assersion when transitioning to suspend state

has been applied to the asoc tree at

https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.3

All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying to this mail.

Thanks, Mark

From c372a35550c8d60f673b20210eea58a06d6d38cb Mon Sep 17 00:00:00 2001

From: Kunihiko Hayashi hayashi.kunihiko@socionext.com Date: Tue, 20 Aug 2019 15:16:04 +0900 Subject: [PATCH] ASoC: uniphier: Fix double reset assersion when transitioning to suspend state

When transitioning to supend state, uniphier_aio_dai_suspend() is called and asserts reset lines and disables clocks.

However, if there are two or more DAIs, uniphier_aio_dai_suspend() are called multiple times, and double reset assersion will cause.

This patch defines the counter that has the number of DAIs at first, and whenever uniphier_aio_dai_suspend() are called, it decrements the counter. And only if the counter is zero, it asserts reset lines and disables clocks.

In the same way, uniphier_aio_dai_resume() are called, it increments the counter after deasserting reset lines and enabling clocks.

Fixes: 139a34200233 ("ASoC: uniphier: add support for UniPhier AIO CPU DAI driver") Signed-off-by: Kunihiko Hayashi hayashi.kunihiko@socionext.com Link: https://lore.kernel.org/r/1566281764-14059-1-git-send-email-hayashi.kunihiko... Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/uniphier/aio-cpu.c | 31 +++++++++++++++++++++---------- sound/soc/uniphier/aio.h | 1 + 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/sound/soc/uniphier/aio-cpu.c b/sound/soc/uniphier/aio-cpu.c index ee90e6c3937c..2ae582a99b63 100644 --- a/sound/soc/uniphier/aio-cpu.c +++ b/sound/soc/uniphier/aio-cpu.c @@ -424,8 +424,11 @@ int uniphier_aio_dai_suspend(struct snd_soc_dai *dai) { struct uniphier_aio *aio = uniphier_priv(dai);

- reset_control_assert(aio->chip->rst); - clk_disable_unprepare(aio->chip->clk); + aio->chip->num_wup_aios--; + if (!aio->chip->num_wup_aios) { + reset_control_assert(aio->chip->rst); + clk_disable_unprepare(aio->chip->clk); + }

return 0; } @@ -439,13 +442,15 @@ int uniphier_aio_dai_resume(struct snd_soc_dai *dai) if (!aio->chip->active) return 0;

- ret = clk_prepare_enable(aio->chip->clk); - if (ret) - return ret; + if (!aio->chip->num_wup_aios) { + ret = clk_prepare_enable(aio->chip->clk); + if (ret) + return ret;

- ret = reset_control_deassert(aio->chip->rst); - if (ret) - goto err_out_clock; + ret = reset_control_deassert(aio->chip->rst); + if (ret) + goto err_out_clock; + }

aio_iecout_set_enable(aio->chip, true); aio_chip_init(aio->chip); @@ -458,7 +463,7 @@ int uniphier_aio_dai_resume(struct snd_soc_dai *dai)

ret = aio_init(sub); if (ret) - goto err_out_clock; + goto err_out_reset;

if (!sub->setting) continue; @@ -466,11 +471,16 @@ int uniphier_aio_dai_resume(struct snd_soc_dai *dai) aio_port_reset(sub); aio_src_reset(sub); } + aio->chip->num_wup_aios++;

return 0;

+err_out_reset: + if (!aio->chip->num_wup_aios) + reset_control_assert(aio->chip->rst); err_out_clock: - clk_disable_unprepare(aio->chip->clk); + if (!aio->chip->num_wup_aios) + clk_disable_unprepare(aio->chip->clk);

return ret; } @@ -619,6 +629,7 @@ int uniphier_aio_probe(struct platform_device *pdev) return PTR_ERR(chip->rst);

chip->num_aios = chip->chip_spec->num_dais; + chip->num_wup_aios = chip->num_aios; chip->aios = devm_kcalloc(dev, chip->num_aios, sizeof(struct uniphier_aio), GFP_KERNEL); diff --git a/sound/soc/uniphier/aio.h b/sound/soc/uniphier/aio.h index ca6ccbae0ee8..a7ff7e556429 100644 --- a/sound/soc/uniphier/aio.h +++ b/sound/soc/uniphier/aio.h @@ -285,6 +285,7 @@ struct uniphier_aio_chip {

struct uniphier_aio *aios; int num_aios; + int num_wup_aios; struct uniphier_aio_pll *plls; int num_plls;