4.14-stable review patch. If anyone has any objections, please let me know.
------------------
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 @@ -486,7 +486,7 @@ 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); \ @@ -1469,6 +1469,14 @@ 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 @@ -330,6 +330,10 @@ 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