[PATCH 4.18 076/135] ASoC: rsnd: dont fallback to PIO mode when -EPROBE_DEFER

Greg Kroah-Hartman
2018-10-16T17:13:44Z

From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

[ Upstream commit 6c92d5a2744e27619a8fcc9d74b91ee9f1cdebd1 ]

Current rsnd driver will fallback to PIO mode if it can't get DMA
handler. But, DMA might return -EPROBE_DEFER when probe timing.
This driver always fallback to PIO mode especially from
commit ac6bbf0cdf4206c ("iommu: Remove IOMMU_OF_DECLARE") because
of this reason.

The DMA driver will be probed later, but sound driver might be
probed as PIO mode in such case. This patch fixup this issue.
Then, -EPROBE_DEFER is not error. Thus, let's don't indicate error
message in such case.
And it needs to call rsnd_adg_remove() individually if probe failed,
because it registers clk which should be unregister.

Maybe PIO fallback feature itself is not needed,
but let's keep it so far.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/soc/sh/rcar/core.c | 10 +++++++++-
sound/soc/sh/rcar/dma.c | 4 ++++
2 files changed, 13 insertions(+), 1 deletion(-)

--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -482,7 +482,7 @@ static int rsnd_status_update(u32 *statu
(func_call && (mod)->ops->fn) ? #fn : ""); \
if (func_call && (mod)->ops->fn) \
tmp = (mod)->ops->fn(mod, io, param); \
- if (tmp) \
+ if (tmp && (tmp != -EPROBE_DEFER)) \
dev_err(dev, "%s[%d] : %s error %d\n", \
rsnd_mod_name(mod), rsnd_mod_id(mod), \
#fn, tmp); \
@@ -1550,6 +1550,14 @@ exit_snd_probe:
rsnd_dai_call(remove, &rdai->capture, priv);
}

+ /*
+ * adg is very special mod which can't use rsnd_dai_call(remove),
+ * and it registers ADG clock on probe.
+ * It should be unregister if probe failed.
+ * Mainly it is assuming -EPROBE_DEFER case
+ */
+ rsnd_adg_remove(priv);
+
return ret;
}

--- a/sound/soc/sh/rcar/dma.c
+++ b/sound/soc/sh/rcar/dma.c
@@ -244,6 +244,10 @@ static int rsnd_dmaen_attach(struct rsnd
/* try to get DMAEngine channel */
chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
if (IS_ERR_OR_NULL(chan)) {
+ /* Let's follow when -EPROBE_DEFER case */
+ if (PTR_ERR(chan) == -EPROBE_DEFER)
+ return PTR_ERR(chan);
+
/*
* DMA failed. try to PIO mode
* see