The patch
ASoC: SOF: Intel: fix HDA codec driver probe with multiple controllers
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
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.
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Thanks, Mark
From 2c63bea714780f8e1fc9cb7bc10deda26fada25b Mon Sep 17 00:00:00 2001
From: Kai Vehmanen kai.vehmanen@linux.intel.com Date: Fri, 10 Jan 2020 17:57:50 -0600 Subject: [PATCH] ASoC: SOF: Intel: fix HDA codec driver probe with multiple controllers
In case system has multiple HDA controllers, it can happen that same HDA codec driver is used for codecs of multiple controllers. In this case, SOF may fail to probe the HDA driver and SOF initialization fails.
SOF HDA code currently relies that a call to request_module() will also run device matching logic to attach driver to the codec instance. However if driver for another HDA controller was already loaded and it already loaded the HDA codec driver, this breaks current logic in SOF. In this case the request_module() SOF does becomes a no-op and HDA Codec driver is not attached to the codec instance sitting on the HDA bus SOF is controlling. Typical scenario would be a system with both external and internal GPUs, with driver of the external GPU loaded first.
Fix this by adding similar logic as is used in legacy HDA driver where an explicit device_attach() call is done after request_module().
Also add logic to propagate errors reported by device_attach() back to caller. This also works in the case where drivers are not built as modules.
Signed-off-by: Kai Vehmanen kai.vehmanen@linux.intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Link: https://lore.kernel.org/r/20200110235751.3404-8-pierre-louis.bossart@linux.i... Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/sof/intel/hda-codec.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/sound/soc/sof/intel/hda-codec.c b/sound/soc/sof/intel/hda-codec.c index 827f84a0722e..fbfa225d1c5a 100644 --- a/sound/soc/sof/intel/hda-codec.c +++ b/sound/soc/sof/intel/hda-codec.c @@ -24,19 +24,18 @@ #define IDISP_VID_INTEL 0x80860000
/* load the legacy HDA codec driver */ -#ifdef MODULE -static void hda_codec_load_module(struct hda_codec *codec) +static int hda_codec_load_module(struct hda_codec *codec) { +#ifdef MODULE char alias[MODULE_NAME_LEN]; const char *module = alias;
snd_hdac_codec_modalias(&codec->core, alias, sizeof(alias)); dev_dbg(&codec->core.dev, "loading codec module: %s\n", module); request_module(module); -} -#else -static void hda_codec_load_module(struct hda_codec *codec) {} #endif + return device_attach(hda_codec_dev(codec)); +}
/* enable controller wake up event for all codecs with jack connectors */ void hda_codec_jack_wake_enable(struct snd_sof_dev *sdev) @@ -129,10 +128,16 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address) if ((mach_params && mach_params->common_hdmi_codec_drv) || (resp & 0xFFFF0000) != IDISP_VID_INTEL) { hdev->type = HDA_DEV_LEGACY; - hda_codec_load_module(&hda_priv->codec); + ret = hda_codec_load_module(&hda_priv->codec); + /* + * handle ret==0 (no driver bound) as an error, but pass + * other return codes without modification + */ + if (ret == 0) + ret = -ENOENT; }
- return 0; + return ret; #else hdev = devm_kzalloc(sdev->dev, sizeof(*hdev), GFP_KERNEL); if (!hdev)